Astronomy:Rho1 Sagittarii
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Short description: Star in the constellation Sagittarius
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 21m 40.35942s[1] |
| Declination | −17° 50′ 49.9168″[1] |
| Apparent magnitude (V) | 3.93[2] |
| Characteristics | |
| Spectral type | A9IV[3] |
| U−B color index | +0.14[2] |
| B−V color index | +0.22[2] |
| Variable type | δ Sct[4] |
| Astrometry | |
| Radial velocity (Rv) | +1.20[5] km/s |
| Proper motion (μ) | RA: −25.87[1] mas/yr Dec.: +21.46[1] mas/yr |
| Parallax (π) | 25.69 ± 0.19[1] mas |
| Distance | 127.0 ± 0.9 ly (38.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 0.97[6] |
| Details | |
| Mass | 1.91[7] M☉ |
| Radius | 3.31+0.24 −0.26[8] R☉ |
| Luminosity | 30.7±0.8[8] L☉ |
| Surface gravity (log g) | 3.89[9] cgs |
| Temperature | 7,469+201 −261[8] K |
| Metallicity [Fe/H] | −0.02[10] dex |
| Rotational velocity (v sin i) | 68[11] km/s |
| Age | 893[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho1 Sagittarii, Latinized from ρ1 Sagittarii, is a single,[13] variable star in the southern constellation of Sagittarius. It has a white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around 3.93.[2] The distance to this star is approximately 127 light years based on parallax,[1] and it is drifting further away with a radial velocity of +1.2 km/s.[5] It is positioned near the ecliptic and so it can be occulted by the Moon.[14]
This object has a stellar classification of A9IV,[3] matching a subgiant star that is evolving away from the main sequence. It is a low amplitude Delta Scuti variable, ranging from 3.94 to 3.90 magnitude with a period of 0.05 days.[4] The star is 893[9] million years old and is spinning with a projected rotational velocity of 68 km/s.[11] It has 1.9[7] times the mass of the Sun and 3.3[8] times the Sun's radius. The star is radiating 31 times the luminosity of the Sun from its photosphere at an effective temperature of 7,469 K.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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
- ↑ 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 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. (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 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
- ↑ 5.0 5.1 Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). Bibcode: 1953GCRV..C......0W.
- ↑ 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
- ↑ 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 8.3 8.4 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.
- ↑ 9.0 9.1 9.2 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
- ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. Vizier catalog entry
- ↑ 11.0 11.1 Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H.
- ↑ "rho01 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho01+Sgr.
- ↑ 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.
- ↑ Edwards, D. A.; Evans, D. S.; Fekel, F. C.; Smith, B. W. (April 1980). "Photoelectric observations of lunar occultations. XI.". Astronomical Journal 85: 478–489. doi:10.1086/112700. Bibcode: 1980AJ.....85..478E.
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