Rho1 Sagittarii

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]

For other star systems with this Bayer designation, see ρ Sagittarii.
ρ1 Sagittarii
Location of ρ1 Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
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
Distance127.0 ± 0.9 ly
(38.9 ± 0.3 pc)
Absolute magnitude (MV)0.97[6]
Details
Mass1.91[7] M☉
Radius3.31+0.24
−0.26[8] R☉
Luminosity30.7±0.8[8] L☉
Surface gravity (log g)3.89[9] cgs
Temperature7,469+201
−261[8] K
Metallicity [Fe/H]−0.02[10] dex
Rotational velocity (v sin i)68[11] km/s
Age893[9] Myr
Other designations
ρ Pav, 44 Sagittarii, BD−18° 5322, GC 26694, GJ 4107, HD 181577, HIP 95168, HR 7340, SAO 162512, PPM 235882, GSC 06301-02457[12]
Database references
SIMBADdata

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. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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. 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: 161. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
  4. Samus, N. N.; Durlevich, O. V.; 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....1.2025S.
  5. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  7. 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  8. 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.
  9. 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. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. Vizier catalog entry
  10. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. Vizier catalog entry
  11. Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H (5th Revised ed.). 5050. Bibcode:1995yCat.5050....0H.
  12. "rho01 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-16.
  13. 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  14. 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. Bibcode:1980AJ.....85..478E. doi:10.1086/112700.
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