# Alonso 2023: No random transits in CHEOPS observations of HD 139139

> R. Alonso, S. Hoyer, M. Deleuil et al., 2023. 7 records on Mysteries Department cite it. The only independent search for the dips; it found none.

Source: https://mysteriesdept.com/sources/SRC0D79RXE47SN4/no-random-transits-in-cheops-observations-of-hd-139139  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Sources](https://mysteriesdept.com/sources)[HD 139139, the "Random Transiter"](https://mysteriesdept.com/mysteries/hd-139139-random-transiter)Alonso 2023

**0**

# No random transits in CHEOPS observations of HD 139139

R. Alonso, S. Hoyer, M. Deleuil et al., 2023. _Astronomy & Astrophysics 680, A78_.

CHEOPS watched the star for 12.75 days in 15 visits of about 20 hours, in 2021 and 2022, sensitive to dips deeper than about 150 ppm and longer than about 1.5 hours. Simulations from the K2 dips predicted at least one detection with 95 per cent probability; none was seen. The authors leave three explanations: bad luck, dipping that had stopped or grown shallower, or unidentified, infrequent instrumental noise in the K2 data.

**HD 139139, the "Random Transiter"** **Primary source** Articledoi: **[10.1051/0004-6361/202347779](https://doi.org/10.1051/0004-6361/202347779)** Checked against the original0

## What it's used for here

The only independent search for the dips; it found none.

## Cited by on this site 7 records

[CHEOPS saw no dips in 12.75 days in 2021–2022](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2FV93QK0J/cheops-saw-no-dips-in-12-75-days-in-20212022)

Evidence

EVD

[K2 pixels can't separate real dimming from a glitch in the saturated bleed column](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2G5TEHHJB/k2-pixels-cant-separate-real-dimming-from-a-glitch-in-the)

Evidence

EVD

[The dips don't behave like a single telegraph pixel or follow the spacecraft's motion](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2G555HMN8/the-dips-dont-behave-like-a-single-telegraph-pixel-or-follow)

Evidence

EVD

[CHEOPS watches the star for 12.75 days in 2021 and 2022 and sees no dips](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/events/EVT0D79S0VG25BD/cheops-watches-the-star-for-12-75-days-in-2021-and-2022-and)

EVT

[K2 pixel forensics for a saturated star](https://mysteriesdept.com/methods/MTH0DD2FKPWB8AP/k2-pixel-forensics-for-a-saturated-star)

Method

MTH

[Single-event dip search with injection-recovery and fair nulls](https://mysteriesdept.com/methods/MTH0DD2FEM3PXJB/single-event-dip-search-with-injection-recovery-and-fair)

Method

MTH

[HD 139139, the "Random Transiter"](https://mysteriesdept.com/mysteries/hd-139139-random-transiter)

The mystery article

MYS

## Cite it

```
Alonso, R., Hoyer, S., Deleuil, M., Simon, A. E., Beck, M., Benz, W., & et al. (2023). No random transits in CHEOPS observations of HD 139139. Astronomy & Astrophysics 680, A78. https://doi.org/10.1051/0004-6361/202347779
```

[Read it free at doi.org](https://doi.org/10.1051/0004-6361/202347779)

Key

**SRC** 0D79RXE47SN4

Kind

Journal article

Rights

The publisher's

Kept

27 Oct 2026, for editors

Checked

Against the published article

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

Bibliographic records are CC0. Take this one as CSL-JSON, BibTeX or RIS.

[CSL-JSON](https://mysteriesdept.com/sources/SRC0D79RXE47SN4/no-random-transits-in-cheops-observations-of-hd-139139/csl.json)