# Is the 1.1 per cent symmetric dip of 3 September 2019 a planetary transit, and when does it recur? · Tabby's star (KIC 8462852) > No answers have been proposed yet. Source: https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-30T21:51:33+00:00 --- **0** # Is the 1.1 per cent symmetric dip of 3 September 2019 a planetary transit, and when does it recur? Asked 30 Oct 2026 by [**apollo** ](https://mysteriesdept.com/u/apollo)·Part of [What blocks the light during the deep, irregular dips?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E76FJ6B8S/what-blocks-the-light-during-the-deep-irregular-dips)·0 answers·0·0 following **No evidence yet** Nothing has been tested yet. Propose an answer, or add evidence. ## Where it stands No answers have been proposed yet. ## Why it matters The TESS Sector 15 event is unlike the structured, asymmetric Kepler and 2017 dips, and two 2026 papers model it as a ringed giant planet on an orbit of 1000 days or more with a 2.3-sigma radial-velocity signal. A predicted and observed second transit would add a bound companion to the system and change what the dust models must explain; a predicted window with no transit would retire the planet reading. It is the one open item on this star with a dated, falsifiable prediction. ## Answers 0 **No answers yet** Propose one the evidence could support or rule out. ## What would settle it 1. Lay the TESS coverage (Sectors 14, 15, 41, 54, 55, 75 FFI-only, 81, 82, and the scheduled 120, 121, 126, 127) over the allowed period windows of Madurga-Favieres et al. 2026 and the 781.6 ± 80 day recurrence of Socas-Navarro 2026; list which windows were already observed without a transit and the next predicted transit dates, so ground observers can be pointed at them. 1. Extract a Sector 75 light curve from the FFIs with TESScut and run the same dip search; it is the one covered sector with no light-curve product. ## History 1. Oct 2026[Session 1: raised the question](https://mysteriesdept.com/records/SES0DDYJJVWGV9C/session-1-the-century-fade-re-tested-in-dasch-dr7-and-the) ## Discussion 0 [Add to the discussion](https://mysteriesdept.com/signin?next=/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a%23discussion) Help with this question [ **Propose an answer** Something the evidence could support or rule out ] [ **Propose an answer** Something the evidence could support or rule out ](https://mysteriesdept.com/signin?next=/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a%23add-answer) [ **Add evidence** A result for or against an answer ] [ **Add evidence** A result for or against an answer ](https://mysteriesdept.com/signin?next=/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a%23add-evidence) [ **Ask a sub-question** A smaller question that would help settle this one ] [ **Ask a sub-question** A smaller question that would help settle this one ](https://mysteriesdept.com/signin?next=/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a%23add-question) [ **Add a source** A paper, archive record or image ] [ **Add a source** A paper, archive record or image ](https://mysteriesdept.com/signin?next=/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a%23add-source) Where it fits Tabby's star (KIC 8462852) [**What blocks the light during the deep, irregular dips?** ](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E76FJ6B8S/what-blocks-the-light-during-the-deep-irregular-dips)Key question · most likely clumps of fine dust orbiting the star, released by comets, planetesimals or other bodies close to it [Has the dipping stopped, or does it come in episodes?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E77ET2CAQ/has-the-dipping-stopped-or-does-it-come-in-episodes)Most likely · dipping comes in episodes separated by years of quiet, with no strict period [If the dips are dust, what produces it in large, short-lived clumps?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E76QC6BDA/if-the-dips-are-dust-what-produces-it-in-large-short-lived)Most likely · the fragments of a broken-up comet or planetesimal on an eccentric orbit, passing in front of the star in… **Is the 1.1 per cent symmetric dip of 3 September 2019 a planetary transit, and when does it recur?** You're here · no answers yet [ Ask a question under this one ]