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Rho1 Sagittarii information


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 mas[1]
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

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Edwards1980 was invoked but never defined (see the help page).

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Rho1 Sagittarii

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Rho1 Sagittarii, Latinized from ρ1 Sagittarii, is a single, variable star in the southern constellation of Sagittarius. It has a white hue and is visible...

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