HD 1185

HD 1185
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
A
Right ascension 00h 16m 21.52890s[1]
Declination +43° 35′ 42.1834″[1]
Apparent magnitude (V) 6.150[2]
B
Right ascension 00h 16m 22.33562s[3]
Declination +43° 35′ 44.5452″[3]
Apparent magnitude (V) 9.76[4]
Characteristics
A
Evolutionary stage main sequence[1]
Spectral type A2VpSi[5]
U−B color index 0.03[6]
B−V color index 0.05[6]
Astrometry
A
Radial velocity (Rv)3.00±2.60[7] km/s
Proper motion (μ) RA: +35.421[1] mas/yr
Dec.: −23.037[1] mas/yr
Parallax (π)10.2349 ± 0.0329 mas[1]
Distance319 ± 1 ly
(97.7 ± 0.3 pc)
B
Radial velocity (Rv)4.48±0.22[3] km/s
Proper motion (μ) RA: +34.310[3] mas/yr
Dec.: −21.927[3] mas/yr
Parallax (π)10.1971 ± 0.0157 mas[3]
Distance319.9 ± 0.5 ly
(98.1 ± 0.2 pc)
Details
A
Mass2.4[1] M☉
Radius2.1[1] R☉
Luminosity38[1] L☉
Surface gravity (log g)4.02[1] cgs
Temperature9,103[8] K
Metallicity [Fe/H]−0.11[8] dex
Rotational velocity (v sin i)128[9] km/s
Age311[1] Myr
B
Mass1.0[3] M☉
Radius0.90[3] R☉
Luminosity0.76[3] L☉
Surface gravity (log g)4.50[3] cgs
Temperature5,712[8] K
Metallicity [Fe/H]−0.26[8] dex
Age224[3] Myr
Other designations
BD+42°41, HD 1185, HIP 1302, HR 56, SAO 36221, WDS 00164+4336[10]
Database references
SIMBADdata

HD 1185 is a double star[11] in the northern constellation of Andromeda. The primary, with an apparent magnitude of 6.15, is a white main-sequence star of spectral type A2VpSi,[5] indicating it has stronger silicon absorption lines than usual, thus making it also an Ap star.[6] The secondary companion, which is 9.08 arcseconds away, is not visible to the naked eye at an apparent magnitude of 9.76. It shares common proper motion and parallax with the primary star[10] but orbital parameters are still unknown.

  1. ^ a b c d e f g h i j k Cite error: The named reference dr3a was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k Cite error: The named reference dr3b was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference tycho was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference abt1981 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference starhorse2 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Binary was invoked but never defined (see the help page).