# HD 139139, the "Random Transiter" > In 2017 NASA's K2 mission recorded 28 shallow dips in the light of HD 139139, a Sun-like star about 107 parsecs away, over 87 days. Each looked like a… Source: https://mysteriesdept.com/mysteries/hd-139139-random-transiter Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-27T17:47:30+00:00 --- **MYS** 0D79RXE46N3D·Mystery · signal # HD 139139, the "Random Transiter" **0** [Follow][Ask a question](https://mysteriesdept.com/questions/key-questions?mystery=hd-139139-random-transiter) HD 139139, the "Random Transiter" ![Photograph: HD 139139, the "Random Transiter"](https://mysteriesdept.com/media/folio/hd-139139-random-transiter-lead) PopePompus · CC BY-SA 4.0 Star HD 139139 (EPIC 249706694), G-type, Teff about 5,800 K, about 107 pc⁠[[2]] Neighbour A K5–K7 star 3.3 arcseconds away, 2.7 magnitudes fainter, probably bound at about 400 au⁠[[2]] Observed K2 Campaign 15, 87 days, 2017⁠[[2]] Dips 28 events; almost all 200 ± 80 ppm deep, 1–7 hours long, about 3 days apart on average⁠[[2]] Periodicity No more than four dips can belong to one periodic sequence⁠[[2]] Found by Citizen scientists in a visual survey of K2 light curves⁠[[2]] Latest TESS full-frame-image light curves from Sector 91 (2025) in MAST, not yet analysed in print⁠[[8]] Status Unexplained Questions 0 of 5 answered People [**Andrew Vanderburg** Co-author; developer of the K2SFF light curves](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/people/FIG0D79RXXR6BPA/andrew-vanderburg)[**Saul Rappaport** MIT astrophysicist; lead author of the discovery paper](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/people/FIG0D79RXNY7H6E/saul-rappaport) Catalog key**MYS** 0D79RXE46N3D The Kepler telescope's extended mission, K2, pointed at a new field roughly every three months after 2014, recording the brightness of thousands of stars every 30 minutes to find planets⁠[[1]]. In Campaign 15, in 2017, it recorded HD 139139, a star about 107 parsecs away of nearly the Sun's temperature and about 1.5 billion years old⁠[[2]]. Volunteers who inspect K2 light curves by eye noticed that its brightness dropped briefly, by about 200 parts per million, 28 times in 87 days. Each dip looked like the transit of a planet about twice the size of Earth. Automatic searches for periodic transits had not flagged it, because the dips were not periodic⁠[[2]]. Saul Rappaport, Andrew Vanderburg and colleagues published the case in 2019 as "the Random Transiter". They showed that the dip times are consistent with a random-number generator and that no more than four can be fitted by a single period. They checked the obvious instrumental causes and found none, while noting that they could not be certain the dips are astrophysical. A fainter star 3.3 arcseconds away falls in the same photometric aperture and is probably a bound companion, so either star could be the host⁠[[2]]. They then tried to explain the dips: several planets, planets around each star, planets with huge timing variations, planets in a close binary, a circumbinary planet, a disintegrating planet, a swarm of dust-emitting asteroids, the dipping seen in young stars, and short-lived starspots. Each failed on the data or needed special assumptions⁠[[2]]. Two short notes have proposed other scenarios⁠[[3]]⁠[[4]], and a radio search for technosignatures has been made⁠[[5]]; these are the published follow-ups. Of the 5 questions on this site, 0 are answered. The most likely answer to “Are the 28 dips real changes in starlight, or an instrumental effect?”, not yet confirmed: the dips are astrophysical, on star A or star B. ### Key questionsset by the editors [**Are the 28 dips real changes in starlight, or an instrumental effect?** ](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79RZW80KRQ/are-the-28-dips-real-changes-in-starlight-or-an-instrumental)Most likely: the dips are astrophysical, on star A or star B [**If the dips are real, what causes them?** ](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79S04202NJ/if-the-dips-are-real-what-causes-them)No answer ahead yet [All 5 questions ](https://mysteriesdept.com/questions/key-questions?mystery=hd-139139-random-transiter) ## What happened K2 Campaign 15 observed the field from August to November 2017; HD 139139 was proposed as a target by three guest-observer programmes⁠[[2]]. The dips were first seen in the Kepler pipeline light curve during a visual survey using the LcTools software, then analysed in a light curve rebuilt from the pixels with the K2SFF method and high-pass filtered to remove starspot modulation⁠[[2]]⁠[[6]]. In 2018 the team took spectra with the TRES spectrograph on Mount Hopkins and the 2.7-metre telescope at McDonald Observatory, and imaging to measure the neighbour's motion⁠[[2]]. The paper was posted in June 2019⁠[[2]]. **Map of the country** [Open the full map](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/map) [+][−] 1 **Fred Lawrence Whipple Observatory, Mount Hopkins, Arizona** Observatory Within 1 km 2 **McDonald Observatory 2.7-metre Harlan J. Smith Telescope, Texas** Observatory Within 1 km 3 **Robert C. Byrd Green Bank Telescope, West Virginia** Radio telescope Mapped MappedWithin 1 kmNatural Earth ### Timeline **Timeline** Squeezed where little happened. Each mark is a published claim, by how it stands:AcceptedMost likelyStill possibleDisputedRuled out ## The accounts The discovery paper is the only full account. Its authors include the citizen scientists who found the dips through a long-running visual survey of K2 light curves, which has also found unusual eclipsing systems and multi-planet systems that automated searches missed⁠[[2]]. Its stated purpose is to bring the object to wider attention and to ask for better spectra of both stars and high-precision monitoring of the fainter one⁠[[2]]. ## What was recorded The record is one 87-day light curve at 30-minute cadence. Of the 28 events, all but two are 200 ± 80 ppm deep; durations range from 0.75 to 7.4 hours; the mean interval is about three days; depth and duration are not correlated⁠[[2]]. Box-least-squares and other period searches find no significant period⁠[[2]]. Tests for rolling-band artefacts, centroid shifts during dips, electronic cross-talk from bright stars and bad pixels found nothing; nearby stars on the detector do not show the dips⁠[[2]]. Independent reductions of the same pixels, such as the EVEREST light curve, are public alongside the pipeline and K2SFF light curves⁠[[7]]⁠[[8]]⁠[[9]]. [![K2 Campaign 15 light curve and pixel data of EPIC 249706694](https://mysteriesdept.com/media/folio/hd-139139-random-transiter-a-k2-lightcurve-c1)](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts/ART0D79S9CY4YRG/k2-campaign-15-light-curve-and-pixel-data-of-epic-249706694) K2 Campaign 15 light curve and pixel data of EPIC 249706694PopePompus, 2017. CC BY-SA 4.0[Artifact ](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts/ART0D79S9CY4YRG/k2-campaign-15-light-curve-and-pixel-data-of-epic-249706694) The two stars are well characterised. Star A, HD 139139 itself, is a G-type star of about 5,800 K with solar metallicity, a rotation period of about 14.5 days and a gyrochronological age of 1.5 ± 0.4 billion years, at 106.7–107.8 pc from Gaia. Star B is a K5–K7 star of about 4,400 K, 3.3 arcseconds away and 2.7 magnitudes fainter in the Gaia red band, at a photometric distance of 115 ± 20 pc, with a similar radial velocity and proper motion; the pair is probably bound at about 400 au⁠[[2]]. Radial velocities rule out stellar or brown-dwarf companions to star A on orbits shorter than about 10 days and low-mass stars on orbits under about 100 days⁠[[2]]. Century-long DASCH plate photometry and five years of ASAS-SN data show nothing unusual⁠[[2]]. If the dips are on star A, the bodies would be about twice Earth's radius; if on star B, whose light is diluted about fifteen times by star A, they would be one to two times the size of Jupiter⁠[[2]]. TESS observed the field in Sector 91 in 2025, and full-frame-image light curves for two catalogue entries at the position are in MAST⁠[[8]]⁠[[10]]. ## The explanations Planets fail on timing. Multiple planets, planets around both stars, and a few planets with very large timing variations cannot reproduce more than about four or five of the dip times; an eccentric planet in a close binary, which would scramble transit times, still left a detectable period in simulations and is opposed by the radial velocities and the single-star spectrum; a circumbinary planet is ruled out by the lack of velocity variation⁠[[2]]. A disintegrating planet on an orbit of under about 5 hours, transiting only when it happened to be shedding dust, would need to be visible in only 7 per cent of more than 400 transits, near the limit at which a periodicity search would still find it; the average dip profile also lacks the asymmetry such dust tails produce⁠[[2]]. A swarm of dust-emitting asteroids on many orbits could give random times, but not so many dips of almost the same depth⁠[[2]]. Two stellar explanations remain open. The dipping seen in young stars with disks could occur on star B and be diluted, but diluted light curves of ten known dippers do not resemble this one and there is no model that explains dippers quantitatively⁠[[2]]. Spots larger than Earth (on A) or Jupiter (on B) that appear within half an hour, last a few hours and vanish would break no physical law, and such events could have gone unnoticed in other stars; this hypothesis is new and untested⁠[[2]]. Instrumental origin cannot be fully excluded with one data set⁠[[2]]. Other scenarios have been put forward in two research notes⁠[[3]]⁠[[4]]; a technosignature search with the Green Bank Telescope has been reported⁠[[5]]. ### Published claims **Published claims and their status** | Year | Who | Claimed | Status | Reason | |---|---|---|---|---| | 2019 | Saul Rappaport and colleagues⁠[2] | The 28 dips are real changes in the light of one of the two stars; data-quality tests found no instrumental cause. | Disputed | CHEOPS saw none of the dips in 2021 and 2022 when it had a 95 per cent chance of seeing one, and lists unidentified K2 noise as one explanation⁠[11]. | | 2019 | Saul Rappaport and colleagues⁠[2] | No model of planets, planets in or around a binary, a disintegrating planet or dusty asteroids reproduces the random times and near-equal depths of the dips. | Accepted | No later work has found a planetary model that fits, and Schneider withdrew his own close-in planet for the main star⁠[4]. | | 2019 | Saul Rappaport and colleagues⁠[2] | Short-lived dark spots that appear within half an hour and vanish after a few hours, or dipper behaviour on the fainter star, could explain the dips. | Still possible | Neither has been tested, and without a second detection there is nothing to test them on⁠[11]. | | 2019 | Jean Schneider⁠[3] | A close-in planet orbiting HD 139139 could produce the dips. | Disputed | Schneider set it aside for HD 139139 after radial velocities over four days showed no such planet, though it may still apply to the fainter star⁠[4]. | | 2019 | Jean Schneider⁠[4] | The dips might come from an eccentric belt of bodies around HD 139139, from interstellar objects, or from objects in our own Solar System. | Still possible | These are tentative scenarios that no observation has yet tested⁠[4]. | | 2019 | Bryan Brzycki and colleagues (Breakthrough Listen)⁠[5] | Green Bank observations found no narrowband radio signals from the star, limiting any transmitter to an equivalent isotropic power of 10 TW. | Accepted | It is a straightforward non-detection that no one has disputed⁠[5]. | | 2023 | Roi Alonso and colleagues (CHEOPS)⁠[11] | CHEOPS saw no dips in 12.75 days of monitoring, so either the dipping stopped or became shallower, the observers were unlucky, or the K2 dips were instrumental noise. | Accepted | The non-detection stands; the 2025 TESS light curve has not yet been searched in a published study⁠[8]. | ## What would settle it A second detection is the first need. High-precision photometry of the pair over several days, resolving the two stars, would show which star dips and whether the dips still occur, which the discovery team asked for directly⁠[[2]]. A search of the 2025 TESS light curve for dips of the same depth and duration, with injected test dips to measure sensitivity, would show whether TESS can see them at all. If the dips recur, their colour would distinguish dust (deeper in blue), solid bodies (grey) and dark spots (dependent on spot temperature); more radial velocities would tighten the limits on hidden companions. If they never recur in a sensitive search, an undetected instrumental cause in the single K2 data set becomes more likely. ## Questions 0 of 5 questions are answered. **Key questions** [All 5](https://mysteriesdept.com/questions/key-questions?mystery=hd-139139-random-transiter) **0** [Are the 28 dips real changes in starlight, or an instrumental effect?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79RZW80KRQ/are-the-28-dips-real-changes-in-starlight-or-an-instrumental) 0 of 1 sub-questions answered·0 Most likely: the dips are astrophysical, on star A or star B **0** [If the dips are real, what causes them?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79S04202NJ/if-the-dips-are-real-what-causes-them) 0 of 1 sub-questions answered·0 Open: 7 answers, none ahead ## Evidence 17 findings [Are the 28 dips real changes in starlight, or an instrumental effect?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79RZW80KRQ/are-the-28-dips-real-changes-in-starlight-or-an-instrumental)6 findings [The dips are astrophysical, on star A or star B.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S0VG5ZJW/the-dips-are-astrophysical-on-star-a-or-star-b)Most likely +[Tests for rolling bands, centroid shifts, cross-talk and bad pixels find nothing; neighbouring stars do not show the dips.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S13A3E7F/tests-for-rolling-bands-centroid-shifts-cross-talk-and-bad)Supported +[The dips were first seen in the Kepler pipeline light curve and analysed in the independent K2SFF reduction.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S1B46GYE/the-dips-were-first-seen-in-the-kepler-pipeline-light-curve)Supported +[An independent dip search recovers the published dips in two separate reductions of the K2 pixels. Against a sign-flipped null that treats dips and brightenings alike, K2SFF has 21 events of 1.5 hours or longer at ≥5.5σ against 6 bumps, and EVEREST 19 dips against 4.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2G4SX1J8X/the-k2-dips-stand-out-in-two-independent-reductions-under-a)Supported [The dips are an undiagnosed instrumental or data-processing effect in the K2 Campaign 15 data.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S1JY7DXT/the-dips-are-an-undiagnosed-instrumental-or-data-processing)Still possible +[The authors state that they cannot formally exclude an anomaly in a group of pixels.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S1TR5WKM/the-authors-state-that-they-cannot-formally-exclude-an)Speculative −[The K2 dip depths are not consistent with one fixed amplitude, as a single random-telegraph pixel would give, and the dip times show no link to K2's 6-hour thruster cycle, its pointing, or its roll position.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2G555HMN8/the-dips-dont-behave-like-a-single-telegraph-pixel-or-follow)Supported −[Run on 619 K2 Campaign 15 stars of similar brightness (Tmag 8.6–9.7, all saturated), the same search finds HD 139139 among the top five for excess events of 1.5 hours or longer. It is the only quiet star whose excess is random, multi-hour, ~200 ppm dips. The four above it are two periodic eclipsing binaries, a star whose dips are about half periodic, and an active M dwarf.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2G5H5GJJG/among-619-bright-saturated-k2-c15-stars-only-hd-139139-shows)Suggestive [If the dips are real, what causes them?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79S04202NJ/if-the-dips-are-real-what-causes-them)9 findings [Several planets, possibly with large transit-timing variations, around one or both stars.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S2AC0ZDR/several-planets-possibly-with-large-transit-timing)Disputed −[No more than four dips can belong to one periodic sequence; models with huge timing variations fit at most about five.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S2J63P9P/no-more-than-four-dips-can-belong-to-one-periodic-sequence)Supported [A planet in a close binary (S-type, eccentric and precessing) or around a binary (P-type), whose transits are…](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S2T07JV5/a-planet-in-a-close-binary-s-type-eccentric-and-precessing)Disputed −[Simulations of an eccentric S-type planet always left a detectable periodicity.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S31T6VDJ/simulations-of-an-eccentric-s-type-planet-always-left-a)Supported −[Radial velocities exclude stellar and brown-dwarf companions to star A on orbits under about 10 days; no composite spectrum is seen.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S39M6XRD/radial-velocities-exclude-stellar-and-brown-dwarf-companions)Supported [A disintegrating ultra-short-period planet whose dust tail is only sometimes thick enough to be seen.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S3HE78QH/a-disintegrating-ultra-short-period-planet-whose-dust-tail)Disputed −[Only 7 per cent of more than 400 transits would show; simulations put this near the limit of detectability.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S3S853YH/only-7-per-cent-of-more-than-400-transits-would-show)Suggestive −[The average dip profile shows none of the asymmetry expected from a dust tail.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S41276X2/the-average-dip-profile-shows-none-of-the-asymmetry-expected)Suggestive [Many dust-emitting asteroids or planetesimals on different orbits.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S48W44R1/many-dust-emitting-asteroids-or-planetesimals-on-different)Disputed −[Almost all dips have similar depths, which many independent bodies are unlikely to produce.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S4GP13BD/almost-all-dips-have-similar-depths-which-many-independent)Suggestive [Dipper-star behaviour of the kind seen in young stars with disks, on star B and diluted by star A.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S4RG7PHD/dipper-star-behaviour-of-the-kind-seen-in-young-stars-with)Still possible +[Star B's possible infrared excess would be hidden by the dilution.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S5842FX3/star-bs-possible-infrared-excess-would-be-hidden-by-the)Speculative −[Ten known dippers diluted by a factor of 15 do not resemble this light curve.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S50A670A/ten-known-dippers-diluted-by-a-factor-of-15-do-not-resemble)Suggestive [Short-lived dark spots that appear within half an hour, last a few hours and vanish.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S5FY6FRB/short-lived-dark-spots-that-appear-within-half-an-hour-last)Still possible +[The authors find no physical law violated and note such events could have gone unnoticed in other stars.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0D79S5QR6MV6/the-authors-find-no-physical-law-violated-and-note-such)Speculative [Do the dips still occur?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79S0KP69RV/do-the-dips-still-occur)2 findings [The dipping is a lasting property of the system and recurs in any long enough observation.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S6YT4CKQ/the-dipping-is-a-lasting-property-of-the-system-and-recurs)Still possible +[The 2025 TESS data contain one dip-like event: at BTJD 3778.5485 ± 0.0046 (BJD 2460778.549), 507 ± 105 ppm deep and 2.2 ± 0.3 h long, the only event above 4.5σ in the clean data. Its false-alarm probability is about 0.5–2 %, so it is marginal.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2FTX3HQBR/one-marginal-dip-like-event-in-tess-sector-91-at-btjd-3778)Speculative −[CHEOPS monitored HD 139139 for 12.75 days in 2021 and 2022 and saw no dips deeper than 150 ppm and longer than 1.5 hours. If the K2 behaviour had continued, the chance of missing them all was 4.8 %.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2FV93QK0J/cheops-saw-no-dips-in-12-75-days-in-20212022)Supported ## Artifacts The films, photos, papers and objects this mystery rests on, each with its own key and its distance from the original. **Artifacts** [See all 8](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts) Photo2 steps from object [K2 Campaign 15 light curve and pixel data of EPIC 249706694](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts/ART0D79S9CY4YRG/k2-campaign-15-light-curve-and-pixel-data-of-epic-249706694) PopePompus · CC BY-SA 4.0 Document2 steps from object [TRES and McDonald spectra of HD 139139](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts/ART0D79SAC665R1/tres-and-mcdonald-spectra-of-hd-139139) Saul Rappaport and colleagues · arXiv non-exclusive licence Document2 steps from object [Breakthrough Listen Green Bank Telescope observations of HD 139139](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts/ART0D79SAVT3V42/breakthrough-listen-green-bank-telescope-observations-of-hd) Bryan Brzycki and colleagues · publisher (licence not confirmed) Dataset1 step from object [TESS Sector 91 full-frame-image light curves at the position of HD 139139](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts/ART0D79SBBE1H5F/tess-sector-91-full-frame-image-light-curves-at-the-position) NASA TESS mission; MIT Quick-Look Pipeline · public-domain [See all 8 artifacts](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/artifacts) ## See also [ **Tabby's star (KIC 8462852)** A star in Cygnus that dimmed by up to 20 per cent at irregular times in Kepler data. ](https://mysteriesdept.com/mysteries/tabbys-star) [ **Mars methane puzzle** Methane reported at Gale crater by the Curiosity rover but not seen from orbit. ](https://mysteriesdept.com/mysteries/mars-methane) [ **Earth flyby anomaly** Small unexplained speed changes in spacecraft that swung past Earth from 1990. ](https://mysteriesdept.com/mysteries/flyby-anomaly) [ **Wow! signal** A 72-second radio signal recorded by Ohio State's Big Ear telescope in August 1977. ](https://mysteriesdept.com/mysteries/wow-signal) ## References 1. 1.[Howell, S., Sobeck, C., Haas, M. et al. 2014. The K2 Mission: Characterization and Early Results. Publications of the Astronomical Society of the Pacific 126(938), 398–408.](https://mysteriesdept.com/sources/SRC0D79RVQE0171/the-k2-mission-characterization-and-early-results)[doi](https://doi.org/10.1086/676406)cited 2 times here**SRC** 0D79RVQE0171 1. 2.[Rappaport, S., Vanderburg, A., Kristiansen, M. et al. 2019. The Random Transiter – EPIC 249706694/HD 139139. Monthly Notices of the Royal Astronomical Society 488(2), 2455–2465.](https://mysteriesdept.com/sources/SRC0D79RTR64N25/the-random-transiter-epic-249706694-hd-139139)[doi](https://doi.org/10.1093/mnras/stz1772)cited 45 times here**SRC** 0D79RTR64N25 1. 3.[Schneider, J. 2019. A Possible Scenario for the Random Transiter EPIC 249706694/HD 139139. Research Notes of the AAS 3(7), 108.](https://mysteriesdept.com/sources/SRC0D79RV000BDF/a-possible-scenario-for-the-random-transiter-epic-249706694)[doi](https://doi.org/10.3847/2515-5172/ab346a)cited 1 time here**SRC** 0D79RV000BDF 1. 4.[Schneider, J. 2019. What is Transiting HD 139139?. Research Notes of the AAS 3(9), 141.](https://mysteriesdept.com/sources/SRC0D79RV7T0TV6/what-is-transiting-hd-139139)[doi](https://doi.org/10.3847/2515-5172/ab465c)cited 1 time here**SRC** 0D79RV7T0TV6 1. 5.[Brzycki, B., Siemion, A., Croft, S. et al. 2019. Breakthrough Listen Follow-up of the Random Transiter (EPIC 249706694/HD 139139) with the Green Bank Telescope. Research Notes of the AAS 3(10), 147.](https://mysteriesdept.com/sources/SRC0D79RVFM3P1R/breakthrough-listen-follow-up-of-the-random-transiter-epic)[doi](https://doi.org/10.3847/2515-5172/ab4bd6)cited 5 times here**SRC** 0D79RVFM3P1R 1. 6.[Vanderburg, A., Johnson, J. 2014. A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission. Publications of the Astronomical Society of the Pacific 126(944), 948–958.](https://mysteriesdept.com/sources/SRC0D79RVZ83K4W/a-technique-for-extracting-highly-precise-photometry-for-the)[doi](https://doi.org/10.1086/678764)cited 4 times here**SRC** 0D79RVZ83K4W 1. 7.[Luger, R., Kruse, E., Foreman-Mackey, D. et al. 2018. An Update to the EVEREST K2 Pipeline: Short Cadence, Saturated Stars, and Kepler-like Photometry Down to Kp = 15. The Astronomical Journal 156(3), 99.](https://mysteriesdept.com/sources/SRC0D79RW722573/an-update-to-the-everest-k2-pipeline-short-cadence-saturated)[doi](https://doi.org/10.3847/1538-3881/aad230)cited 2 times here**SRC** 0D79RW722573 1. 8.[Space Telescope Science Institute 2026. Mikulski Archive for Space Telescopes (MAST): K2 and TESS light curves. 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