Omicron Sagittarii

From Wikipedia, the free encyclopedia
Jump to: navigation, search
ο Sagittarii
Omicron Sagittarii-small.png
ο Sagittarii's position in Sagittarius
(rendered in Celestia)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 04m 40.98s [1]
Declination −21° 44′ 29.4″ [1]
Apparent magnitude (V) + 3.771[2]
Characteristics
Spectral type K0III
Astrometry
Proper motion (μ) RA: 76.35 ± 0.31 [1] mas/yr
Dec.: −58.12 ± 0.18 [1] mas/yr
Parallax (π) 22.96 ± 0.24[1] mas
Distance 142 ± 1 ly
(43.6 ± 0.5 pc)
Absolute magnitude (MV) 0.625[2]
Details
Mass 2.14[2] M
Surface gravity (log g) 2.66[2] cgs
Temperature 4,759[2] K
Metallicity [Fe/H] −0.04[2] dex
Other designations
Manubrij, ο Sagittarii, ο Sgr, Omicron Sgr, 39 Sagittarii, BD-21 5237, CCDM J19047-2144A, GC 26224, HD 177241, HIP 93683, HR 7217, IDS 18587-2153, PPM 269274, SAO 187643, ADS 11996, WDS J19047-2144A.
Database references
SIMBAD data

Omicron Sagittarii (Omicron Sgr, ο Sagittarii, ο Sgr) is a binary star in the constellation Sagittarius. ο Sagittarii is located 142 light years from Earth[1] and is a spectral type K0 orange giant with an apparent magnitude of +3.77. It has a faint, 13th magnitude companion, ο Sagittarii B, 36 arc seconds away.

Because it is close to the ecliptic, ο Sagittarii can be occulted by the Moon and very rarely by planets. The last occultation of ο Sagittarii by a planet took place on 24 December 1937, when it was occulted by Mercury.[citation needed]

Name and etymology[edit]

References[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007). "HIP 93683". Hipparcos, the New Reduction. Retrieved 2009-12-04. 
  2. ^ a b c d e f Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x. 
  3. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 11 日