Astronomy:Rho Pegasi
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 55m 13.66706s[1] |
| Declination | +08° 48′ 58.2387″[1] |
| Apparent magnitude (V) | 4.90[2] |
| Characteristics | |
| Spectral type | A1V[3] |
| U−B color index | +0.00[2] |
| B−V color index | +0.00[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.6±0.9[4] km/s |
| Proper motion (μ) | RA: +80.370[1] mas/yr Dec.: +13.282[1] mas/yr |
| Parallax (π) | 11.9131 ± 0.2232[1] mas |
| Distance | 274 ± 5 ly (84 ± 2 pc) |
| Absolute magnitude (MV) | +0.01[5] |
| Details | |
| Mass | 2.84[6] M☉ |
| Radius | 3.1[7] R☉ |
| Luminosity | 110[6] L☉ |
| Surface gravity (log g) | 3.90[8] cgs |
| Temperature | 9,484[6] K |
| Rotational velocity (v sin i) | 107[6] km/s |
| Age | 331[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho Pegasi, Latinized from ρ Pegasi, also named Leidian,[10] is a star in the northern constellation of Pegasus, near the southern constellation boundary with Pisces. This is a probable astrometric binary system, as determined by changes to the proper motion of the visible component.[11] It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.90.[2] The system is located at a distance of approximately 274 light years from the Sun based on parallax,[1] but it is drifting closer with a radial velocity of −10.6 km/s.[4]
This visible component is an A-type main-sequence star with a stellar classification of A1V.[3] The star is 331[8] million years old and is spinning with a projected rotational velocity of 107 km/s.[6] It has 2.8[6] times the mass of the Sun and 3.1[7] times the Sun's radius. The star is radiating 110[6] times the luminosity of the Sun from its photosphere at an effective temperature of 9,484 K.[6]
In Chinese astronomy, this star is part of the constellation Léi Diàn (Thunder and Lightning, 雷電). The IAU Working Group on Star Names adopted the name Leidian for this star on 13 August 2026, after this Chinese constellation.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ 4.0 4.1 Gontcharov, G. A. (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. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. Vizier catalog entry
- ↑ 7.0 7.1 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ↑ 8.0 8.1 8.2 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. Vizier catalog entry
- ↑ "rho Peg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+Peg.
- ↑ 10.0 10.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/.
- ↑ 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.
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