9 Boötis

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9 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation
Boötes
Right ascension 13h 56m 34.18044s[1]
Declination +27° 29′ 31.4851″[1]
Apparent magnitude (V) 5.02[2]
Characteristics
Evolutionary stage giant
Spectral type K3 III[3]
B−V color index 1.441±0.005[2]
Variable type suspected irregular[4]
Distance
630 ± 20 ly
(192 ± 5 pc)
Absolute magnitude (MV)−1.23[2]
Details
Rotational velocity (v sin i)
1.5[6] km/s
HR 5247, SAO 83084[7]
Database references
SIMBADdata

9 Boötis is a single,

apparent visual magnitude of 5.02.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −41 km/s.[2]

This is an aging

luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,197 K.[6]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    ISSN 0067-0049
    .
  4. ^
    S2CID 125853869
    .
  5. ^
    doi:10.1086/191527
    .
  6. ^
    S2CID 46595131
    , 123.
  7. ^ a b "9 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 25, 2019.
  8. S2CID 14878976
    .
  9. ^ "NSV 6502", The International Variable Star Index, American Association of Variable Star Observers, retrieved 2019-04-26.
  10. doi:10.1086/172242
    .
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