Astronomy:GJ 1002
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus[2] |
| Right ascension | 00h 06m 43.19732s[3] |
| Declination | −07° 32′ 17.0191″[3] |
| Apparent magnitude (V) | 13.837±0.003[4] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M5.5V[4] |
| Apparent magnitude (V) | 13.837±0.003[4] |
| Apparent magnitude (G) | 11.774±0.003[3] |
| Apparent magnitude (J) | 8.323±0.019[4] |
| Apparent magnitude (H) | 7.792±0.034[5] |
| Apparent magnitude (K) | 7.439±0.021[5] |
| Astrometry | |
| Radial velocity (Rv) | −40.46±0.30[3] km/s |
| Proper motion (μ) | RA: −811.566[3] mas/yr Dec.: −1893.251[3] mas/yr |
| Parallax (π) | 206.3500 ± 0.0474[3] mas |
| Distance | 15.806 ± 0.004 ly (4.846 ± 0.001 pc) |
| Details[4] | |
| Mass | 0.120±0.010 M☉ |
| Radius | 0.137±0.005 R☉ |
| Luminosity (bolometric) | 0.001406±0.000019 L☉ |
| Surface gravity (log g) | 5.10±0.06 cgs |
| Temperature | 3024±52 K |
| Metallicity [Fe/H] | −0.25±0.19 dex |
| Rotation | 161.28±2.93[6] days |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
GJ 1002, or LHS 2, is a nearby red dwarf star, located 15.8 light-years (4.8 parsecs) away from the Solar System in the constellation of Cetus. At an apparent magnitude of 13.8, it is much too faint to be visible to the naked eye. It hosts a system of two known exoplanets.
With a spectral type of M5.5V, this star is a red dwarf similar to Proxima Centauri. It has 12% the mass and 14% the radius of the Sun, and a temperature of 3,024 K (2,751 °C; 4,984 °F).[4] It is a slowly rotating star with a low level of magnetic activity.[7] Prior to the discovery of planets, it was an object of interest for the study of molecular features in its spectrum.[7][8]
Planetary system
Two planetary companions to GJ 1002 were discovered in 2022 via radial velocity. Both have minimum masses close to that of Earth and orbit within the habitable zone of their star. While these planets do not transit their host star, it may be possible to determine the presence and composition of atmospheres with future instruments such as the ANDES spectrograph for the Extremely Large Telescope.[4]
As of 2023[update], GJ 1002 b & c are the fourth- and fifth-closest known Earth-mass exoplanets within the conservatively defined habitable zone, after Proxima Centauri b, GJ 1061 d, and Teegarden's Star c, and followed by Wolf 1069 b.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.08±0.13 M⊕ | 0.0457±0.0013 | 10.3465±0.027 | — | — | — |
| c | ≥1.36±0.17 M⊕ | 0.0738±0.0021 | 21.202±0.013 | — | — | — |
See also
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Suárez Mascareño, A. et al. (December 2022). "Two temperate Earth-mass planets orbiting the nearby star GJ 1002". Astronomy & Astrophysics 670: A5. doi:10.1051/0004-6361/202244991. Bibcode: 2023A&A...670A...5S.
- ↑ 5.0 5.1 5.2 "GJ 1002". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+1002.
- ↑ Kemmer, J.; Lafarga, M.; Fuhrmeister, B.; Shan, Y.; Schöfer, P.; Jeffers, S. V.; Caballero, J. A.; Quirrenbach, A. et al. (2025-04-11). "The CARMENES search for exoplanets around M dwarfs. Cluster analysis of signals from spectral activity indicators to search for shared periods". Astronomy and Astrophysics 697. doi:10.1051/0004-6361/202347056. Bibcode: 2025A&A...697A.225K.
- ↑ 7.0 7.1 Wende, S.; Reiners, A.; Seifahrt, A.; Bernath, P. F. (November 2010). "CRIRES spectroscopy and empirical line-by-line identification of FeH molecular absorption in an M dwarf". Astronomy and Astrophysics 523: A58. doi:10.1051/0004-6361/201015220. Bibcode: 2010A&A...523A..58W.
- ↑ Serindag, Dilovan B.; Snellen, Ignas A. G.; Mollière, Paul (November 2021). "Measuring titanium isotope ratios in exoplanet atmospheres". Astronomy & Astrophysics 655: A69. doi:10.1051/0004-6361/202141941. Bibcode: 2021A&A...655A..69S.
- ↑ Kossakowski, D. et al. (January 2023). "The CARMENES search for exoplanets around M dwarfs, Wolf 1069 b: Earth-mass planet in the habitable zone of a nearby, very low-mass star". Astronomy & Astrophysics 670: A84. doi:10.1051/0004-6361/202245322. Bibcode: 2023A&A...670A..84K.
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