HD 73256

Not to be confused with HD 73526.
HD 73256
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pyxis
Right ascension 08h 36m 23.01654s[1]
Declination −30° 02′ 15.4462″[1]
Apparent magnitude (V) 8.08[2]
Characteristics
Spectral type G8 IV-V Fe+0.5[3]
B−V color index 0.782±0.002[2]
Variable type BY Dra[4]
Astrometry
Radial velocity (Rv)29.66±0.14[1] km/s
Proper motion (μ) RA: −182.193(17) mas/yr[1]
Dec.: 67.373(21) mas/yr[1]
Parallax (π)27.2441 ± 0.0217 mas[1]
Distance119.72 ± 0.10 ly
(36.71 ± 0.03 pc)
Absolute magnitude (MV)5.20[2]
Details[5]
Mass1.01±0.03 M☉
Radius0.94±0.02 R☉
Luminosity0.74±0.01 L☉
Surface gravity (log g)4.49±0.03 cgs
Temperature5,532±36 K
Metallicity [Fe/H]0.29±0.05[6] dex
Rotational velocity (v sin i)3.22±0.32[6] km/s
Age2.5±2.3 Gyr
Other designations
CS Pyx, CD−29°6456, HD 73256, HIP 42214, SAO 176159[7]
Database references
SIMBADdata

HD 73256 is a variable star in the southern constellation of Pyxis. It has the variable star designation CS Pyxidis. With a baseline apparent visual magnitude of 8.08,[2] it requires binoculars or a small telescope to view. The star is located at a distance of 120 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +30 km/s.[2]

The stellar classification of this star is G8IV-VFe+0.5, which suggests a slightly evolved G-type main-sequence star with a mild overabundance of iron in the spectrum. It is a BY Draconis variable with a period of 13.97 days, showing a variation of 0.03 in magnitude due to chromospheric activity.[4] The star appears overluminous for its class, which may be the result of a high metallicity.[6] The star has roughly the same mass and a slightly smaller radius as the Sun, but is radiating 74% of the Sun's luminosity.[5] It is around 2–3 billion years old and is spinning with a projected rotational velocity of 3.2 km/s.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Gray_et_al_2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Udry2003 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).