Eta Cephei

η Cephei
Location of η Cephei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cepheus
Right ascension 20h 45m 17.37517s[1]
Declination +61° 50′ 19.6142″[1]
Apparent magnitude (V) 3.426[2]
Characteristics
Spectral type K0 IV[3]
U−B color index +0.613[2]
B−V color index +0.918[2]
Astrometry
Radial velocity (Rv)−87.55±0.11[4] km/s
Proper motion (μ) RA: +85.993 mas/yr[1]
Dec.: +818.451 mas/yr[1]
Parallax (π)69.5976 ± 0.1279 mas[1]
Distance46.86 ± 0.09 ly
(14.37 ± 0.03 pc)
Absolute magnitude (MV)2.631[3]
Details
Mass1.6[5] M☉
Radius3.86±0.02[6] R☉
Luminosity8.4±0[6] L☉
Surface gravity (log g)3.41[7] cgs
Temperature5,000±9[6] K
Metallicity [Fe/H]−0.32[7] dex
Rotational velocity (v sin i)6.79[8] km/s
Age2.5±0.3[5] Gyr
Other designations
3 Cephei, BD+61 2050, FK5 783, HD 198149, HIP 102422, HR 7957, SAO 19019.[9]
Database references
SIMBADdata

Eta Cephei (η Cep, η Cephei) is a star in the northern circumpolar constellation of Cepheus. With an apparent visual magnitude of 3.4,[2] this is a third magnitude star that, according to the Bortle Dark-Sky Scale, is readily visible to the naked eye. Parallax measurements put it at a distance of 14.37 parsecs (46.9 light-years) from Earth.[1]

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aaa480_1_91 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference aaa430_165 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference aaa433_2_647 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference npoi was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa526_A100 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa520_A79 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).