Epsilon Capricorni

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Epsilon Capricorni
Location of ε Capricorni (circled)
Observation data
ICRS
)
Constellation Capricornus
Right ascension 21h 37m 04.83068s[1]
Declination −19° 27′ 57.6464″[1]
Apparent magnitude (V) +4.62[2]
Characteristics
Spectral type B2.5 Vpe[3]
U−B color index −0.64[2]
B−V color index −0.19[2]
Variable type γ Cas[4]
Distance
1,060 ± 60 ly
(320 ± 20 pc)
Absolute magnitude (MV)−3.03[5]
Details
ε Cap A
Myr
HIP 106723, HR 8260, SAO 164520, WDS J21371-1928A[10]
Database references
SIMBADdata

Epsilon Capricorni,

apparent visual magnitude of 4.62.[2]

In

Chinese name for ε Capricorni itself is 壘壁陣二 (Lěi Bì Zhèn èr, English: the Second Star of Line of Ramparts.)[14]

A light curve for Epsilon Capricorni, adapted from Lefèvre et al. (2009)[15]

The binary system has an

emission lines in the spectrum. This circumstellar shell is inclined by 80° to the line of sight from the Earth.[6] The system is undergoing both short term and long term variations in luminosity, with the short period variations showing a phase cycle of 1.03 days.[4] It is classified as a Gamma Cassiopeiae variable with an amplitude of 0.16 in magnitude.[4]

Epsilon Capricorni Aa is a blue-white hued

oblate shape with an equatorial bulge that is 7% larger than the polar radius.[7]

The system has two visual companions. Component B is a visual magnitude 10.11 star at an

arc seconds along a position angle of 46°, as of 2013. Component C with visual magnitude of 14.1 lies at an angular separation of 62.7 arc seconds along a position angle of 164°, as of 1999.[12] Both stars are likely to be unrelated and at different distances to Epsilon Capricorni.[16]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    doi:10.1086/112600
    .
  3. ^
    Bibcode:2000IBVS.5008....1A
    .
  4. ^
    Bibcode:2002JAD.....8....1B
    .
  5. ^
    S2CID 119257644
    .
  6. ^
    S2CID 120167606
    , 82.
  7. ^
    S2CID 119273474
    .
  8. S2CID 118629873
    .
  9. Bibcode:2004yCat.4027....0K
    .
  10. Centre de Données astronomiques de Strasbourg
    , retrieved 2017-05-15.
  11. S2CID 14878976
    .
  12. ^
    doi:10.1086/323920
    , retrieved 2015-07-22
  13. ISBN 978-986-7332-25-7
    .
  14. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Archived 2011-05-21 at the Wayback Machine
  15. doi:10.1051/0004-6361/200912304
    . Retrieved 29 July 2022.
  16. S2CID 244398875
    .

External links

  • eps Cap, American Association of Variable Star Observers, retrieved 2017-05-17.
  • Kaler, James B. (October 9, 2015), "Epsilon Capricorni", Stars, University of Illinois, retrieved 2017-05-17.
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