Registry · deep sky

TRAPPIST-1

Low-Mass* SIMBAD LM* M7.5e 1,349 papers

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 23h 06m 29.37s
Declination: −05° 02′ 29.0″
Galactic l, b: 69.713, -56.64
Magnitude V: 18.8
Parallax: 80.212 mas
Redshift z: -0.00017345
Radial velocity: -52.003 km/s
Proper motion: 930.8, -479 mas/yr

Also known as

16 identifiers

2MASS J23062928-05022852MASSI J2306292-0502272MASSW J2306292-0502272MUCD 12171AP J23062928-0502285CNS5 5691EPIC 200164267EPIC 246199087Gaia DR2 2635476908753563008Gaia DR3 2635476908753563008K2-112Karmn J23064-050TIC 278892590WISEA J230630.02-050234.1TOI-6838TRAPPIST-1

Published measurements

3 quantities measured more than once

One object can carry a dozen published estimates of the same quantity. The register keeps them side by side rather than picking a winner — the citation is part of the value.

Mass 7 values

Value	Unit	Uncertainty	Source	Reference	Year
0.0898	M_sun	± 0.0023	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2025	2025
0.0898	M_sun	± 0.0023	NASA Exoplanet Archive	Agol et al. 2021	2021
0.0898	M_sun	± 0.0023	NASA Exoplanet Archive	Ducrot et al. 2020	2020
0.089	M_sun	± 0.007	NASA Exoplanet Archive	Grimm et al. 2018	2018
0.0802	M_sun	± 0.0073	NASA Exoplanet Archive	Gillon et al. 2017	2017
0.08	M_sun	± 0.009	NASA Exoplanet Archive	Gillon et al. 2016	2016
0.090778	M_sun	± 0.02001	NASA Exoplanet Archive	TICv8	2016

Radius 7 values

Value	Unit	Uncertainty	Source	Reference	Year
0.1192	R_sun	± 0.0013	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2025	2025
0.1192	R_sun	± 0.0013	NASA Exoplanet Archive	Agol et al. 2021	2021
0.1234	R_sun	± 0.0033	NASA Exoplanet Archive	Ducrot et al. 2020	2020
0.117	R_sun	± 0.0036	NASA Exoplanet Archive	Gillon et al. 2017	2017
0.117	R_sun	± 0.004	NASA Exoplanet Archive	Gillon et al. 2016	2016
0.114827	R_sun	± 0.003357	NASA Exoplanet Archive	TICv8	2016
0.114827	R_sun	± 0.003357	NASA Exoplanet Archive	ExoFOP	2016

Effective temperature 6 values

Value	Unit	Uncertainty	Source	Reference	Year
2,566	K	± 26	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2025	2025
2,566	K	± 26	NASA Exoplanet Archive	Agol et al. 2021	2021
2,520	K	± 39	NASA Exoplanet Archive	Ducrot et al. 2020	2020
2,559	K	± 50	NASA Exoplanet Archive	Gillon et al. 2017	2017
2,550	K	± 55	NASA Exoplanet Archive	Gillon et al. 2016	2016
5,780	K		NASA Exoplanet Archive	ExoFOP	2016

Related objects

Object	Type	Relation
TRAPPIST-1 b	Exoplanet	host
TRAPPIST-1 c	Exoplanet	host
TRAPPIST-1 d	Exoplanet	host
TRAPPIST-1 e	Exoplanet	host
TRAPPIST-1 f	Exoplanet	host
TRAPPIST-1 g	Exoplanet	host
TRAPPIST-1 h	Exoplanet	host

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
TRAPPIST-1 c	Exoplanet	16.23″	17.02
TRAPPIST-1 d	Exoplanet	16.23″	17.02
TRAPPIST-1 e	Exoplanet	16.23″	17.02
TRAPPIST-1 f	Exoplanet	16.23″	17.02
TRAPPIST-1 g	Exoplanet	16.23″	17.02
TRAPPIST-1 h	Exoplanet	16.23″	17.02
TRAPPIST-1 b	Exoplanet	16.23″	17.02
4C -05.95	Blazar	264.4″	19.5

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/trappist-1-1353525 · Registry entry updated 2026-08-14.