HD 4628 information

HD 4628
Observation data; Epoch J2000 Equinox J2000
Constellation	Pisces
Right ascension	00h 48m 22.97634s
Declination	+05° 16′ 50.2096″
Apparent magnitude (V)	5.74
Characteristics
Spectral type	K2.5 V
U−B color index	+0.60
B−V color index	+0.89
Astrometry
Radial velocity (Rv)	−10.41±0.15 km/s
Proper motion (μ)	RA: 755.561 mas/yr ; Dec.: −1,141.745 mas/yr
Parallax (π)	134.4948 ± 0.0578 mas
Distance	24.25 ± 0.01 ly ; (7.435 ± 0.003 pc)
Absolute magnitude (MV)	6.37
Details
Mass	0.70±0.10 M☉
Radius	0.749±0.051 R☉
Luminosity	0.28 L☉
Surface gravity (log g)	4.39±0.16 cgs
Temperature	5,055±40 K
Metallicity [Fe/H]	–0.22 dex
Rotation	38.0 days
Age	5.4 Gyr
Other designations
	96 G. Piscium[10], BD+04°123, HD 4628, HIP 3765, HR 222, SAO 109471, LHS 121, LTT 10285, Wolf 25, Lal 1299
Database references
SIMBAD	data

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.^[9] 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.^[12]

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).^[13] 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.^[14]

^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference apj720_2_1290 was invoked but never defined (see the help page).
^ Cite error: The named reference van Belle2009 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aaa521_A12 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference MH08 was invoked but never defined (see the help page).
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^ Cite error: The named reference aa291_2_517 was invoked but never defined (see the help page).
^ Cite error: The named reference aa575_A35 was invoked but never defined (see the help page).
^ Cite error: The named reference Hartkpof1984 was invoked but never defined (see the help page).

[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).

[Mermilliod1986-2] Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).

[aj132_1_161-3] Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).

[GaiaEDR3-4] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[Holmberg2009-5] Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).

[apj720_2_1290-6] Cite error: The named reference apj720_2_1290 was invoked but never defined (see the help page).

[van_Belle2009-7] Cite error: The named reference van Belle2009 was invoked but never defined (see the help page).

[aaa521_A12-8] Cite error: The named reference aaa521_A12 was invoked but never defined (see the help page).

[MH08-9] Cite error: The named reference MH08 was invoked but never defined (see the help page).

[gould-10] Cite error: The named reference gould was invoked but never defined (see the help page).

[SIMBAD-11] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[aa291_2_517-12] Cite error: The named reference aa291_2_517 was invoked but never defined (see the help page).

[aa575_A35-13] Cite error: The named reference aa575_A35 was invoked but never defined (see the help page).

[Hartkpof1984-14] Cite error: The named reference Hartkpof1984 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Constellation	Pisces
Right ascension	00^h 48^m 22.97634^s^[1]
Declination	+05° 16′ 50.2096″^[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 (R_v)	−10.41±0.15^[1] km/s
Proper motion (μ)	RA: 755.561^[1] mas/yr Dec.: −1,141.745^[1] mas/yr
Parallax (π)	134.4948 ± 0.0578 mas^[4]
Distance	24.25 ± 0.01 ly (7.435 ± 0.003 pc)
Absolute magnitude (M_V)	6.37^[5]

Details

Mass	0.70±0.10^[6] `M`_☉
Radius	0.749±0.051^[7] `R`_☉
Luminosity	0.28^[6] `L`_☉
Surface gravity (log g)	4.39±0.16^[6] cgs
Temperature	5,055±40^[6] K
Metallicity [Fe/H]	–0.22^[8] dex
Rotation	38.0 days^[8]
Age	5.4^[9] Gyr

Other designations
96 G. Piscium[10], BD+04°123, HD 4628, HIP 3765, HR 222, SAO 109471, LHS 121, LTT 10285, Wolf 25, Lal 1299^[11]
Database references
SIMBAD	data

HD 4628 information

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HD 4628

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