Astronomy:GJ 3305
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 04h 37m 37.4553s[2] |
| Declination | −02° 29′ 28.951″[2] |
| Apparent magnitude (V) | +10.59[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | M1.1V[5] |
| Astrometry | |
| Radial velocity (Rv) | +20.03+0.10 −0.09[6] km/s |
| Proper motion (μ) | RA: +54[2] mas/yr Dec.: –47[2] mas/yr |
| Parallax (π) | 36.0085 ± 0.4758[2] mas |
| Distance | 91 ± 1 ly (27.8 ± 0.4 pc) |
| Orbit[6] | |
| Period (P) | 29.39+0.53 −0.44 yr |
| Semi-major axis (a) | 0.335+0.004 −0.003" (9.30+0.24 −0.21 au) |
| Eccentricity (e) | 0.19±0.01 |
| Inclination (i) | 92.17+0.10 −0.12° |
| Longitude of the node (Ω) | 18.88±0.10° |
| Periastron epoch (T) | 2036.67±0.14 |
| Argument of periastron (ω) (secondary) | −66.2+2.5 −2.3° |
| Semi-amplitude (K1) (primary) | 4.01±0.38[4] km/s |
| Details | |
| GJ 3305 A | |
| Mass | 0.52±0.02[6] M☉ |
| Luminosity | 0.112±0.007[4] L☉ |
| Surface gravity (log g) | 4.5[4] cgs |
| Temperature | 3,500[4] K |
| Age | 20–30[6] Myr |
| GJ 3305 B | |
| Mass | 0.44±0.05[4] M☉ |
| Luminosity | 0.043±0.005[4] L☉ |
| Surface gravity (log g) | 4.5[4] cgs |
| Temperature | 3,500[4] K |
| Age | 20–30[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
GJ 3305 is a binary star system in the constellation of Eridanus, notable for being bound to 51 Eridani, an exoplanet-hosting F-type main-sequence star. Based on parallax measurements, it is located at a distance of 91 light-years (28 parsecs).
Characteristics
The two components of GJ 3305 are red dwarfs[4] with a combined spectral type of M1.1V.[5] They orbit around each other with a period of 29.4 years, following a slightly eccentric orbit with e = 0.19 and a semi-major axis of 9.3 au. The orbit is seen nearly edge-on, with an inclination of 92.1°. The primary, GJ 3305 A, has a mass of 0.52±0.02 M☉, while the secondary, GJ 3305 B, has a mass of 0.44±0.05 M☉. Both components are young, estimated to be between 20 and 30 million years old.[6]
GJ 3305 was first noted as a physical companion to 51 Eridani in 2006. The two systems are separated by 66", yielding a projected separation of ~2,000 au.[8]
See also
References
- ↑ 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.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ Reid, I. Neill; Cruz, Kelle L.; Allen, Peter; Mungall, F.; Kilkenny, D.; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J. et al. (July 2004). "Meeting the Cool Neighbors. VIII. A Preliminary 20 Parsec Census from the NLTT Catalogue". The Astronomical Journal 128 (1): 463–483. doi:10.1086/421374. ISSN 0004-6256.
- ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 Montet, Benjamin T.; Bowler, Brendan P.; Shkolnik, Evgenya L.; Deck, Katherine M.; Wang, Ji; Horch, Elliott P.; Liu, Michael C.; Hillenbrand, Lynne A. et al. (2015). "Dynamical Masses of Young M Dwarfs: Masses and Orbital Parameters of Gj 3305 Ab, the Wide Binary Companion to the Imaged Exoplanet Host 51 Eri". The Astrophysical Journal 813 (1): L11. doi:10.1088/2041-8205/813/1/L11. Bibcode: 2015ApJ...813L..11M.
- ↑ 5.0 5.1 Shkolnik, Evgenya; Liu, Michael C.; Reid, I. Neill (2009-06-16). "Identifying the Young Low-mass Stars within 25 pc. I. Spectroscopic Observations". The Astrophysical Journal 699 (1): 649–666. doi:10.1088/0004-637x/699/1/649. ISSN 0004-637X.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Calissendorff, Per; Janson, Markus; Rodet, Laetitia; Köhler, Rainer; Bonnefoy, Mickaël; Brandner, Wolfgang; Brown-Sevilla, Samantha; Chauvin, Gaël et al. (2022-10-01). "Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries" (in en). Astronomy & Astrophysics 666: A16. doi:10.1051/0004-6361/202142766. ISSN 0004-6361.
- ↑ "GJ 3305". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+3305.
- ↑ Feigelson, E. D.; Lawson, W. A.; Stark, M.; Townsley, L.; Garmire, G. P. (March 2006). "51 Eridani and GJ 3305: A 10-15 Myr old Binary Star System at 30 Parsecs". The Astronomical Journal 131 (3): 1730–1739. doi:10.1086/499923. ISSN 0004-6256.
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