82 Virginis
82 Virginis, also known as m Virginis, is a star in the constellation Virgo. It is located 160 pc (520 light-years) from Earth based on a parallax of 6.249±0.2611 mas from Gaia DR2.[1] It is a red giant, based on its spectral type of M1III.[2] Its apparent magnitude is 5.01.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 41m 36.77s[1] |
| Declination | −08° 42′ 10.73″[1] |
| Apparent magnitude (V) | 5.01[3] |
| Characteristics | |
| Evolutionary stage | Red giant |
| Spectral type | M1III |
| Apparent magnitude (U) | 8.59[2] |
| Apparent magnitude (B) | 6.64[2] |
| Apparent magnitude (G) | 4.149[2] |
| Apparent magnitude (J) | 1.68[2] |
| Apparent magnitude (H) | 0.88[2] |
| Apparent magnitude (K) | 0.64[2] |
| B−V color index | 1.623±0.009[4] |
| Astrometry | |
| Radial velocity (Rv) | −36.6±2[2] km/s |
| Proper motion (μ) | RA: -91.65 mas/yr[4] Dec.: 40.28 mas/yr[4] |
| Parallax (π) | 6.2490 ± 0.2611 mas[1] |
| Distance | 521.7 ly (160.03 pc)[1] |
| Details | |
| Radius | 70.81[1] R☉ |
| Luminosity | 887.925[1] L☉ |
| Surface gravity (log g) | 0.714[3] cgs |
| Temperature | 3675[3] K |
| Rotational velocity (v sin i) | 2.3±1[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Characteristics
[edit]82 Virginis is a red giant star, based on its spectral type of M1III,[2] where M means that it is an M-type star and III is the luminosity class, meaning it is a giant star. The star is 70.8 times larger than the Sun and 890 times more voluminous.[1] The effective temperature of the star is 3675 K,[3] which is 2197 degrees colder than the solar temperature of 5772 K. Its rotational velocity is 2.3 km/s.[5] The angular diameter of the star, as measured from the CHARM survey, is of 4.48±0.28 mas.[6] At the current distance, this would lead to a radius of 77 R☉, which is similar to the radius derived by Gaia DR2.
The parallax of the star is measured at 6.249±0.2611 mas from Gaia DR2, translating to a distance of 160 parsecs (520 light-years) from Earth.[1] The star is moving towards Earth at a velocity of 36.6 km/s.[2] Its apparent magnitude is 5.01,[3] making it visible to the naked eye.[a]
Notes
[edit]- ^ According to the Bortle scale
References
[edit]- ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g h i j "82 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-05-01.
- ^ a b c d e f Ghosh, Supriyo; Mondal, Soumen; Das, Ramkrishna; Khata, Dhrimadri (2019-01-29). "Spectral Calibration of K$-$M Giants from medium resolution near-infrared HK-band spectra". Monthly Notices of the Royal Astronomical Society. arXiv:1901.09170. doi:10.1093/mnras/stz299. ISSN 0035-8711.
- ^ a b van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos record for this source at VizieR.
- ^ a b Zamanov, R. K.; Bode, M. F.; Melo, C. H. F.; Stateva, I. K.; Bachev, R.; Gomboc, A.; Konstantinova-Antova, R.; Stoyanov, K. A. (2008-10-11). "Rotational velocities of the giants in symbiotic stars: III. Evidence of fast rotation in S-type symbiotics". Monthly Notices of the Royal Astronomical Society. 390 (1): 377–382. arXiv:0807.3817. Bibcode:2008MNRAS.390..377Z. doi:10.1111/j.1365-2966.2008.13751.x.
- ^ Richichi, A.; Percheron, I. (2002-05-01). "CHARM: A Catalog of High Angular Resolution Measurements". Astronomy and Astrophysics. 386 (2): 492–503. Bibcode:2002A&A...386..492R. doi:10.1051/0004-6361:20020236. hdl:1887/7492. ISSN 0004-6361.