HD 3240

HD 3240
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 00h 36m 08.30992s[1]
Declination +54° 10′ 06.4147″[1]
Apparent magnitude (V) 5.08[2]
Characteristics
Spectral type B7 III[3]
B−V color index −0.098±0.003[2]
Variable type constant[4]
Astrometry
Radial velocity (Rv)+1.1±2.8[2] km/s
Proper motion (μ) RA: +23.133[1] mas/yr
Dec.: −1.584[1] mas/yr
Parallax (π)6.8287 ± 0.1447 mas[1]
Distance480 ± 10 ly
(146 ± 3 pc)
Absolute magnitude (MV)−1.03[3]
Details
Mass3.91±0.08[5] M☉
Luminosity405+43
−39[5] L☉
Surface gravity (log g)3.696±0.016[6] cgs
Temperature11885±82[5] K
Rotational velocity (v sin i)59[5] km/s
Age201[7] Myr
Other designations
BD+53°102, GC 708, HD 3240, HIP 2854, HR 144, SAO 21551, GSC 03654-02131[8]
Database references
SIMBADdata

HD 3240 is a single[9] star in the northern constellation of Cassiopeia, positioned near Zeta Cassiopeiae. This object has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.08.[2] The distance to HD 3240 is approximately 480 light years based on parallax. At that range, the visual magnitude of the star is diminished by an extinction of 0.22 due to interstellar dust.[7]

This star has a stellar classification of B7 III,[3] matching an aging giant star that has exhausted the supply of hydrogen at its core. It is around 201[7] million years old and is spinning with a projected rotational velocity of 59 km/s,[5] well below its critical velocity of 335 km/s.[6] The star has 3.9[5] times the mass of the Sun and is radiating 405 times the Sun's luminosity from its photosphere at an effective temperature of 11,885 K.[5]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference huang2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Jerzykiewicz1993 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Huang2010 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).