HD 4628

HD 4628
Observation data
Epoch J2000      Equinox J2000
Constellation Pisces
Right ascension 00h 48m 22.97596s[1]
Declination +05° 16′ 50.2095″[1]
Apparent magnitude (V) 5.74[2]
Characteristics
Spectral type K2.5 V[3]
U−B color index +0.60[3]
B−V color index +0.89[3]
Astrometry
Radial velocity (Rv)−10.37±0.12[1] km/s
Proper motion (μ) RA: +755.894 mas/yr[1]
Dec.: −1141.019 mas/yr[1]
Parallax (π)134.4948 ± 0.0578 mas[1]
Distance24.25 ± 0.01 ly
(7.435 ± 0.003 pc)
Absolute magnitude (MV)6.37[4]
Details[5]
Mass0.778±0.007 M☉
Radius0.762±0.012 R☉
Luminosity0.292±0.007 L☉
Surface gravity (log g)4.64±0.01 cgs
Temperature5,093±33 K
Metallicity [Fe/H]−0.26±0.01 dex
Rotation38.0 days[6]
Age5.4[7] Gyr
Other designations
96 G. Piscium[8], BD+04°123, HD 4628, HIP 3765, HR 222, SAO 109471, LHS 121, LTT 10285, Wolf 25, Lalande 1299[9]
Database references
SIMBADdata

HD 4628 (96 G. Piscium) is a main sequence star in the equatorial constellation of Pisces. It has a spectral classification of K2.5 V and an effective temperature of 5,055 K, giving it an orange-red hue with a slightly smaller mass and girth than the Sun. HD 4628 lies at a distance of approximately 24.3 light years from the Sun based on parallax.[1] The apparent magnitude of 5.7[2] is just sufficient for this star to be viewed with the unaided eye. The star appears to be slightly older than the Sun—approximately 5.4 billion years in age.[7] The surface activity is low and, based upon the detection of UV emission, it may have a relatively cool corona with a temperature of one million K.[10]

The star has a relatively high proper motion of 1.4″ per year and is moving in our general direction with a radial velocity of −10.4 km/s.[1] HD 4628 will make its closest approach to the Sun in about 32,000 years, when it comes within 20 ly (7.3 pc).[11] No definitive companion has yet been found in orbit around this star. In 1958 it was thought to have stellar companion that was also a flare star, but this was subsequently disproved.[12]

  1. ^ a b c d e f g Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Soubiran2024 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference aaa521_A12 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference MH08 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference gould 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).
  10. ^ Cite error: The named reference aa291_2_517 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aa575_A35 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Hartkpof1984 was invoked but never defined (see the help page).