Epsilon Cephei

Source: Wikipedia, the free encyclopedia.
Epsilon Cephei

A visual band light curve for Epsilon Cephei, adapted from Bruntt et al. (2007)[1]
Observation data
ICRS
)
Constellation Cepheus
Right ascension 22h 15m 02.19530s[2]
Declination +57° 02′ 36.8771″[2]
Apparent magnitude (V) 4.15 - 4.21[3]
Characteristics
Spectral type F0 V (Sr II)[4] or F0 IV[5]
U−B color index +0.073[6]
B−V color index +0.277[6]
Variable type δ Sct[3]
Distance
85 ± 2 ly
(26.2 ± 0.7 pc)
Absolute magnitude (MV)+2.13[8]
Details
ε Cep Aa
Gyr
ε Cep Ab
Mass0.57[12] M☉
HIP 109857, HR 8494, SAO 34227[13]
Database references
SIMBADdata

Epsilon Cephei,

apparent visual magnitude of 4.18.[6]

Properties

Physical Characteristics

This is a yellow-white hued,

AU. This dust has a combined mass equal to 6.6% of the Earth's mass.[10]

Binary

There is a faint companion star at an

AU. The probability of a random star being situated this close to Epsilon Cephei is about one in a million, so it is most likely physically associated. If so, then the debris disk is probably circumbinary. The fact that this companion was not detected during the Hipparcos mission may indicate its orbit has a high eccentricity. The companion star has a K-band magnitude of 7.8 and is probably of class K8–M2.[5]

Naming

In

Chinese name for ε Cephei itself is 螣蛇九 (Téng Shé jiǔ, English: the Ninth Star of Flying Serpent)[14]

References

  1. doi:10.1051/0004-6361:20065766
    .
  2. ^
    S2CID 18759600
    .
  3. ^ a b c "eps Cep", AAVSO Website, American Association of Variable Star Observers, retrieved 2017-05-07.
  4. ^
    doi:10.1086/319956
    .
  5. ^
    S2CID 37505271
    , L12.
  6. ^
    doi:10.1086/110602
    .
  7. S2CID 119231169
  8. ^
    S2CID 119257644
    .
  9. ^
    S2CID 33401607
    .
  10. ^
    S2CID 11879505
    .
  11. S2CID 18475298
    .
  12. doi:10.1093/mnras/stt1932
    .
  13. Centre de Données astronomiques de Strasbourg
    , retrieved 2017-05-06.
  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
Retrieved from "https://en.wikipedia.org/w/index.php?title=Epsilon_Cephei&oldid=1213258652"