52 Sagittarii

52 Sagittarii
Location of 52 Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 19h 36m 42.43288s[1]
Declination −24° 53′ 01.0288″[1]
Apparent magnitude (V) 4.59[2] + 9.2
Characteristics
Evolutionary stage main sequence[3]
Spectral type B8/9V[4] + K2–4V
U−B color index −0.15[5]
B−V color index −0.06[5]
Astrometry
Radial velocity (Rv)−19.00[6] km/s
Proper motion (μ) RA: +68.30[1] mas/yr
Dec.: −21.51[1] mas/yr
Parallax (π)17.20 ± 0.23 mas[1]
Distance190 ± 3 ly
(58.1 ± 0.8 pc)
Absolute magnitude (MV)0.77[2]
Details
52 Sgr A
Mass3.0±0.1[7] M☉
Radius2.1[8] R☉
Luminosity60.5+1.9
−1.8[3] L☉
Surface gravity (log g)4.19[9] cgs
Temperature10,592+74
−72[3] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)48[3] km/s
Age57.3±11.7[7] Myr
Other designations
h2 Sgr, 52 Sgr, NSV 12191, CD−25°14184, GC 27089, HD 184707, HIP 96465, HR 7440, SAO 188337, CCDM J19367-2453AB, WDS J19367-2453AB, GSC 06893-02132[11]
Database references
SIMBADdata

52 Sagittarii is a binary star[12] system in the southern constellation of Sagittarius. It has the Bayer designation h2 Sagittarii, while 52 Sagittarii is the Flamsteed designation. This system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.59.[2] It is located approximately 190 light years away based on parallax,[1] but is drifting closer with a radial velocity of −19 km/s.[6]

The primary component is a B-type main-sequence star with a stellar classification of B8/9V.[4] Garrison and Gray (1994) assigned it a class of kB8 hB9 HeA0 Va (Sr Fe II),[13] displaying the calcium K line of a B8 class star, the hydrogen lines of a B9 star, and the helium lines of an A0 star, along with overabundances of strontium and iron. It is around 57[7] million years old with three[7] times the mass of the Sun and about 2.1[8] times the Sun's radius. It is radiating 60.5[3] times the luminosity of the Sun from its photosphere at an effective temperature of 10,592 K.[3] The star is spinning with a projected rotational velocity of 48 km/s.[3]

52 Sagittarii has one companion at an angular separation of 2.4″. This object is magnitude 9.2 with a spectral class in the K2V-K4V range, and is believed to be the source of X-ray emissions from the system.[14][15]

  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 Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  9. ^ 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. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Garrison1994 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Hubrig2007 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).