Astronomy:HD 31975
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 04h 53m 05.6446s[1] |
| Declination | −72° 24′ 27.6449″[1] |
| Apparent magnitude (V) | 6.28[2] |
| Characteristics | |
| Spectral type | F9 V Fe−0.5[3] |
| U−B color index | +0.01[4] |
| B−V color index | +0.52[4] |
| Astrometry | |
| Radial velocity (Rv) | 26.8 ± 0.3[5] km/s |
| Proper motion (μ) | RA: −46.178[1] mas/yr Dec.: +270.916[1] mas/yr |
| Parallax (π) | 30.8217 ± 0.0217[1] mas |
| Distance | 105.82 ± 0.07 ly (32.44 ± 0.02 pc) |
| Absolute magnitude (MV) | +3.72[2] |
| Details | |
| Mass | 1.13[6] M☉ |
| Radius | 1.46[6] R☉ |
| Luminosity | 2.77[6] L☉ |
| Surface gravity (log g) | 4.16[6] cgs |
| Temperature | 6.165[6] K |
| Metallicity [Fe/H] | 0.00[7] dex |
| Rotational velocity (v sin i) | 6[8] km/s |
| Age | 3.5[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 31975 (HR 1606) is a star situated in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.28, which is near the threshold of naked eye visibility. It is relatively close at a distance of about 106 light years[1] but is receding with a heliocentric radial velocity of 26.9 km/s.[5]
HD 31975 has a stellar classification of F9 V Fe−0.5, indicating that it is a F-type main-sequence star with a mild under abundance of iron in its atmosphere.[3] At present it has 120% the mass of the Sun and 146% the radius of the Sun.[6] It shines at double the luminosity of the Sun from its photosphere at an effective temperature of 6,165 K,[6] giving it a yellow-white glow. HD 31975 has a similar metallicity to the Sun[7] and at an age of 3.5 billion years[7] it spins slowly with a projected rotational velocity of 6 km/s.[8]
The Washington Double Star Catalog lists a faint M5 companion 16.5" away, which is related to the star.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; De Lee, Nathan; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane et al. (2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal 156 (3): 102. doi:10.3847/1538-3881/aad050. Bibcode: 2018AJ....156..102S.
- ↑ 7.0 7.1 7.2 7.3 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics 530: A138. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode: 2011A&A...530A.138C.
- ↑ 8.0 8.1 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S. et al. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs". Astronomy and Astrophysics 418: 989–1019. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. Bibcode: 2004A&A...418..989N.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
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