Omicron Sagittarii

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Omicron Sagittarii
Location of ο Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 04m 40.98177s[1]
Declination −21° 44′ 29.3845″[1]
Apparent magnitude (V) +3.771[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type G9IIIb[4]
B−V color index +1.012±0.008[5]
Distance
142 ± 1 ly
(43.6 ± 0.5 pc)
Absolute magnitude (MV)0.625[2]
Details
Gyr
PPM 269274, ADS 11996, CCDM J19047-2144A, WDS J19047-2144A[8]
Database references
SIMBADdata

ο Sagittarii, Latinized as Omicron Sagittarii, is a single

light years based on parallax.[1] It is drifting further away from the Sun with a radial velocity of +26 km/s, having come to within 86 ly around a million years ago.[5]

This object is position 0.86 degrees north of the ecliptic, so ο Sagittarii can be occulted by the Moon and very rarely by planets. The last occultation by a planet took place on 24 December 1937, when it was occulted by Mercury.[citation needed] It was almost eclipsed by the sun, which occupies a mean, rounded, half of one degree of the sky, on 5 January.[10] Thus the star can be viewed the whole night, crossing the sky, in early July.

This is an aging

Sun's luminosity from its swollen photosphere at an effective temperature of 4,744 K.[7]

It has a faint, magnitude 13.8 companion, designated component B and positioned 38.4

″ away along a position angle of 252°, as of 2010.[11]

Name and etymology

  • In
    Chinese name for ο Sagittarii itself is 建二 (Jiàn èr, English: the Second Star of Establishment.)[12]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    doi:10.1111/j.1365-2966.2007.11852.x
    .
  3. ^
    S2CID 16673121
    .
  4. ^
    doi:10.1086/191373
    .
  5. ^
    S2CID 119257644
    .
  6. ^
    S2CID 118505114
    .
  7. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  8. ^ "omi Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-09.
  9. S2CID 14878976
    .
  10. ^ In the Sky Earth astronomy reference utility showing the ecliptic and relevant date as at J2000 - present
  11. doi:10.1086/323920
    .
  12. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 11 日
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