Global Information Lookup Global Information

Theta1 Sagittarii information


For other stars with this Bayer designation, see θ Sagittarii.
Theta1 Sagittarii
Location of θ1 Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 19h 59m 44.17834s[1]
Declination −35° 16′ 34.7049″[1]
Apparent magnitude (V) 4.37[2]
Characteristics
Spectral type B3 IVp[3]
U−B color index −0.67[2]
B−V color index −0.15[2]
Astrometry
Proper motion (μ) RA: +5.60[1] mas/yr
Dec.: −25.81[1] mas/yr
Parallax (π)6.29 ± 0.21 mas[1]
Distance520 ± 20 ly
(159 ± 5 pc)
Absolute magnitude (MV)−1.63[4]
Orbit[5]
Period (P)2.1051 d
Eccentricity (e)0.00
Periastron epoch (T)2411140.645 JD
Argument of periastron (ω)
(secondary)		0.00°
Semi-amplitude (K1)
(primary)		15.9 km/s
Details
θ1 Sgr A
Mass6.6±0.1[6] M☉
Radius5.6[7] R☉
Luminosity (bolometric)2,271[8] L☉
Temperature17,900[8] K
Rotational velocity (v sin i)73[3] km/s
Age32.8±5.0[6] Myr
Other designations
θ1 Sgr, CD−35° 13831, HD 189103, HIP 98412, HR 7623, SAO 211716, WDS J19597-3517[9]
Database references
SIMBADdata

Theta1 Sagittarii (θ1 Sagittarii) is a close binary star[10] system in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent visual magnitude of 4.37.[2] Based upon an annual parallax shift of 6.29 mas as seen from Earth,[1] this star is located around 520 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.24 due to interstellar dust.[11]

This is a single-lined spectroscopic binary with an orbital period of just 2.1 days in a circular orbit.[5] The visible member, component A, is a B-type subgiant star with a stellar classification of B3 IVp.[3] It is around 33[6] million years old and is spinning with a projected rotational velocity of 73 km/s.[3] The primary has 6.6[6] times the mass of the Sun and about 5.6[7] times the Sun's radius. It is radiating 2,271[8] times the solar luminosity from its photosphere at an effective temperature of 17,900 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 Nicolet1978 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference levato1975 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Pourbaiz2004 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference hohle2010 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).

and 1 Related for: Theta1 Sagittarii information

Request time (Page generated in 0.755 seconds.)

Theta1 Sagittarii

Last Update:

Theta1 Sagittarii (θ1 Sagittarii) is a close binary star system in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent...

Word Count : 540
PDF Search Engine © AllGlobal.net