Astronomy:Rho Serpentis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 51m 15.90985s[3] |
| Declination | +20° 58′ 40.5166″[3] |
| Apparent magnitude (V) | 4.78[4] |
| Characteristics | |
| Spectral type | K4.5III[5] |
| U−B color index | +1.88[4] |
| B−V color index | +1.54[4] |
| Astrometry | |
| Radial velocity (Rv) | −61.96[6] km/s |
| Proper motion (μ) | RA: −53.32[3] mas/yr Dec.: +18.87[3] mas/yr |
| Parallax (π) | 8.70 ± 0.30[3] mas |
| Distance | 370 ± 10 ly (115 ± 4 pc) |
| Absolute magnitude (MV) | −0.56[7] |
| Details | |
| Radius | 47.84+0.49 −1.19[8] R☉ |
| Luminosity | 491.9±22.3[8] L☉ |
| Surface gravity (log g) | 1.68[9] cgs |
| Temperature | 3,930+50 −20[8] K |
| Metallicity [Fe/H] | −0.08[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho Serpentis, Latinized from ρ Serpentis, is a single[11] star in the Caput section of the equatorial Serpens constellation. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.78.[4] The distance to this star is approximately 375 light years based on parallax,[3] but it is drifting closer to the Sun with a radial velocity of −62 km/s.[6]
This is an aging giant star with a stellar classification of K4.5III.[5] It is a suspected variable star of unknown type, with an I-band brightness ranging from 3.29 down to 3.44 magnitude.[12] Hipparcos photometry revealed a microvariability with a frequency of 0.17017 cycles per day and an amplitude of 0.0080.[2] With the supply of hydrogen exhausted at its core, it has expanded and now has 48[8] times the Sun's girth. The star is radiating 492[8] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,930 K.[8]
References
- ↑ /ftp/cats/more/HIP/cdroms/cats, Strasbourg astronomical Data Center, https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats, retrieved 15 October 2022.
- ↑ 2.0 2.1 Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 4.0 4.1 4.2 4.3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 5.0 5.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 6.0 6.1 Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F
- ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series 74: 1075–1128. doi:10.1086/191527. Bibcode: 1990ApJS...74.1075M.
- ↑ "rho Ser". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+Ser.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
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