Categories
K2-371
Topic: Astronomy
From HandWiki - Reading time: 5 min
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 32m 16.1124s[1] |
| Declination | +11° 37′ 50.5893″[1] |
| Apparent magnitude (V) | 14.64±0.06[2] |
| Characteristics | |
| Spectral type | K3 V[3] |
| B−V color index | +1.00[2] |
| R−I color index | +0.28[2] |
| Variable type | Planetary transit[4] |
| Astrometry | |
| Proper motion (μ) | RA: −9.507[1] mas/yr Dec.: −2.164[1] mas/yr |
| Parallax (π) | 2.235 ± 0.0232[1] mas |
| Distance | 1,460 ± 20 ly (447 ± 5 pc) |
| Details | |
| Mass | 0.96+0.44−0.30[5] M☉ |
| Radius | 0.72+0.09−0.01[3] R☉ |
| Luminosity | 0.304[6] L☉ |
| Surface gravity (log g) | 4.68±0.15[5] cgs |
| Temperature | 4952±122[6] K |
| Metallicity [Fe/H] | −0.11±0.23[5] dex |
| Rotational velocity (v sin i) | 3.2[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
K2-371 (EPIC 211399359) is a star in the equatorial zodiac constellation Cancer. It has an apparent magnitude of 14.64, requiring a powerful telescope to be seen. Parallax measurements place the object at a distance of 1,460 light years.
K2-371 has a stellar classification of K3 V,[3] indicating that it is an ordinary K-type main-sequence star. It has 96% the mass of the Sun[5] and 72% the radius of the Sun.[5] It shines with a luminosity 30.4% that of the Sun[6] from its photosphere at an effective temperature of 4,952 K,[6] giving an orange hue. Unlike most planetary hosts, K2-371 is slightly metal deficent with a poorly constrained iron abundance 77% that of the Sun,[5] and spins modestly with a projected rotational velocity of 3.2 km/s.[7]
Planetary System
In 2016, K2-371 was selected as a target for exoplanets. A group of astronomers happened to find a hot Jupiter orbiting the star with a period of 3.115 days.[8] Unlike most transiting planets, K2-371b's orbital eccentricity and inclination is unknown.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | — | 0.08518[5] | 3.115[8] | — | — | 1.16±0.08[5] RJ |
Reference
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (14 January 2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal 145 (2): 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z.
- ↑ 3.0 3.1 3.2 Dressing, Courtney D.; Hardegree-Ullman, Kevin; Schlieder, Joshua E.; Newton, Elisabeth R.; Vanderburg, Andrew; Feinstein, Adina D.; Duvvuri, Girish M.; Arnold, Lauren et al. (30 July 2019). "Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. IV. Updated Properties for 86 Cool Dwarfs Observed during Campaigns 1–17". The Astronomical Journal 158 (2): 87. doi:10.3847/1538-3881/ab2895. PMID 35095106. Bibcode: 2019AJ....158...87D.
- ↑ Barros, S. C. C.; Demangeon, O.; Deleuil, M. (October 2016). "New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission". Astronomy & Astrophysics 594: A100. doi:10.1051/0004-6361/201628902. ISSN 0004-6361. Bibcode: 2016A&A...594A.100B.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Christiansen, Jessie L. et al. (9 May 2022). "Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2–18". The Astronomical Journal 163 (6): 244. doi:10.3847/1538-3881/ac5c4c. ISSN 0004-6256. Bibcode: 2022AJ....163..254C.
- ↑ 6.0 6.1 6.2 6.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 7.0 7.1 Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Fulton, Benjamin J.; Howard, Andrew W. et al. (14 December 2017). "Planet Candidates from K2 Campaigns 5–8 and Follow-up Optical Spectroscopy". The Astronomical Journal 155 (1): 21. doi:10.3847/1538-3881/aa9b83. Bibcode: 2018AJ....155...21P.
- ↑ 8.0 8.1 Pope, Benjamin J. S.; Parviainen, Hannu; Aigrain, Suzanne (8 June 2016). "Transiting exoplanet candidates fromK2Campaigns 5 and 6". Monthly Notices of the Royal Astronomical Society 461 (4): 3399–3409. doi:10.1093/mnras/stw1373. ISSN 0035-8711. Bibcode: 2016MNRAS.461.3399P.
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