HD 9289

HD 9289
Location of HD 9289 (circled)
Observation data
Epoch J2000.0[1]      Equinox J2000.0[1]
Constellation Cetus
Right ascension 01h 31m 16.47427s
Declination −11° 07′ 07.9356″
Apparent magnitude (V) 9.38[2] (combined)
Characteristics
Evolutionary stage Main-sequence star
Spectral type A3V,[3] A3 SrEuCr[4]
Apparent magnitude (K) 9.08 ± 0.03 (A), 10.77 ± 0.05 (B)[5]
B−V color index 0.25[2]
J−H color index 0.086[6]
J−K color index 0.095[6]
Variable type Rapidly oscillating Ap star
Astrometry
Radial velocity (Rv)11.352±0.0017[7] km/s
Proper motion (μ) RA: -8.756[1] mas/yr
Dec.: −24.435[1] mas/yr
Parallax (π)3.2569 ± 0.1379 mas[1]
Distance1,000 ± 40 ly
(310 ± 10 pc)
Orbit[5]
PrimaryHD 9289 A
CompanionHD 9289 B
Semi-major axis (a)0.441±0.003″
Details
Luminosity8.7+1.5
−1.3[3] L☉
Surface gravity (log g)4.50±0.20[3] cgs
Temperature8710+410
−392,[3] 7750[8] K
Rotation8.660±0.006 d[8]
Rotational velocity (v sin i)10.50[9] km/s
Other designations
BW Ceti, BD−11° 286, Gaia DR2 2458519750738240768, Gaia DR3 2458519755033679360, HD 9289, SAO 147854, PPM 210286, TIC 136842396, TYC 5274-240-1, GSC 05274-00240, 2MASS J01311648-1107078[6]
Database references
SIMBADdata

HD 9289 is a white-hued variable star in the constellation of Cetus. It has the variable-star designation BW Ceti (abbreviated to BW Cet). With an apparent magnitude of 9.38, it is too faint to be observed by the naked eye from Earth. It is located at a distance of approximately 1,000 light-years (310 parsecs) according to Gaia EDR3 parallax measurements, and is moving away from the Solar System at a heliocentric radial velocity of 11.352 km/s.

  1. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference TYC2000 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Shen2023 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Scholler2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Soubiran2018 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Holdsworth2021 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Joshi2016 was invoked but never defined (see the help page).