Astronomy:HD 84117
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | 09h 42m 14.4162s[2] |
| Declination | −23° 54′ 56.042″[2] |
| Apparent magnitude (V) | 4.918±0.046[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | F8V[4] |
| U−B color index | 0.00[5] |
| B−V color index | +0.53[5] |
| R−I color index | +0.28[5] |
| Astrometry | |
| Radial velocity (Rv) | 34.70±0.13[2] km/s |
| Proper motion (μ) | RA: −399.497[2] mas/yr Dec.: +262.319[2] mas/yr |
| Parallax (π) | 66.8827 ± 0.1123[2] mas |
| Distance | 48.77 ± 0.08 ly (14.95 ± 0.03 pc) |
| Absolute magnitude (MV) | 4.05[1] |
| Details | |
| Mass | 1.15±0.01[6] M☉ |
| Radius | 1.302±0.003[2] R☉ |
| Luminosity | 2.049+0.009 −0.008[2] L☉ |
| Habitable zone inner limit | 1.03[7] AU |
| Habitable zone outer limit | 2.41[7] AU |
| Surface gravity (log g) | 4.46±0.03[6] cgs |
| Temperature | 6,229±8[6] K |
| Metallicity [Fe/H] | −0.045±0.007[6] dex |
| Rotational velocity (v sin i) | 7.0[8] km/s |
| Age | 2.60+0.24 −0.19[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 84117 is a star in the constellation of Hydra. It has an apparent visual magnitude of 4.92, hence can be seen from the naked eye in sufficiently dark skies, far from light pollution. Based on parallax measurements, it lies 48.77 light-years away. It is drifting away from the Solar System at a radial velocity of 34.7 km/s.
With a spectral class of F8V,[4] this is a F star which is in the main sequence, fusing atoms of hydrogen into helium. Stellar evolution models suggest it is approaching the end of its main sequence lifetime.[2] The star has about 1.15 times the Sun's mass[6] and 1.30 times the Sun's radius. It radiates 2.05 times the Sun's luminosity from the photosphere[2] at an effective temperature of 6,229 K. Its age is estimated at 2.6 billion years.[6]
This star has a cold debris disk with a radius of 27.27 astronomical units. The temperature of the debris is estimated at 60 K (−213.2 °C), and the total mass of the disk is estimated at 1.2×10−5 Earth masses.[10] Unlike other debris disk hosts, HD 84117 does not display an infrared excess. The disk contributes to less than 1.7%×10−4 of the system's luminosity.[11]
HD 84117 presents a significant difference on proper motion measurements taken by the Hipparcos and Gaia spacecrafts, suggesting it may be orbited by a giant planet.[7]
See also
- List of nearest F-type stars
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 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.
- ↑ Paunzen, E. (2015-08-01). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy and Astrophysics 580: A23. doi:10.1051/0004-6361/201526413. ISSN 0004-6361. Bibcode: 2015A&A...580A..23P.
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars" (in en). The Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. ISSN 0067-0049. Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 5.2 HR 3862, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line January 20, 2011.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Carvalho-Silva, Gabriela; Meléndez, Jorge; Rathsam, Anne; Shejeelammal, J.; Martos, Giulia; Lorenzo-Oliveira, Diego; Spina, Lorenzo; Ribeiro Alves, Débora (April 2025). "A New Age–Activity Relation For Solar Analogs that Accounts for Metallicity" (in en). The Astrophysical Journal Letters 983 (2): L31. doi:10.3847/2041-8213/adc382. ISSN 2041-8205. Bibcode: 2025ApJ...983L..31C.
- ↑ 7.0 7.1 7.2 Painter, Katie E.; Bowler, Brendan P.; Franson, Kyle; Becker, Juliette C.; Burt, Jennifer A. (2025-06-26). "Astrometric Accelerations of Provisional Targets for the Habitable Worlds Observatory". The Astronomical Journal.
- ↑ Luck, R. Earle (December 2016). "Abundances in the Local Region II: F, G and K Dwarfs and Subgiants" (in en). The Astronomical Journal 153 (1): 21. doi:10.3847/1538-3881/153/1/21. ISSN 1538-3881.
- ↑ "HD 84117". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+84117.
- ↑ Gáspár, András; Rieke, George H.; Ballering, Nicholas (August 2016). "The Correlation between Metallicity and Debris Disk Mass" (in en). The Astrophysical Journal 826 (2): 171. doi:10.3847/0004-637X/826/2/171. ISSN 0004-637X. Bibcode: 2016ApJ...826..171G. HD 84117's database entry in VizieR.
- ↑ Yelverton, Ben; Kennedy, Grant M.; Su, Kate Y. L. (June 2020). "No significant correlation between radial velocity planet presence and debris disc properties" (in en). Monthly Notices of the Royal Astronomical Society 495 (2): 1943–1957. doi:10.1093/mnras/staa1316. ISSN 0035-8711. Bibcode: 2020MNRAS.495.1943Y. HD 84117's database entry in VizieR.
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