Psi2 Piscium information

Psi² Piscium
	Location of ψ2 Piscium (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Pisces
Right ascension	01h 07m 57.16387s
Declination	+20° 44′ 20.8310″
Apparent magnitude (V)	+5.56
Characteristics
Spectral type	A3 V
B−V color index	+0.12
Astrometry
Radial velocity (Rv)	−15.2±0.9 km/s
Proper motion (μ)	RA: +86.72 mas/yr ; Dec.: −82.75 mas/yr
Parallax (π)	21.14 ± 0.77 mas
Distance	154 ± 6 ly ; (47 ± 2 pc)
Absolute magnitude (MV)	+2.19
Details
Mass	1.82 M☉
Radius	2.0 R☉
Luminosity	13 L☉
Surface gravity (log g)	4.36±0.14 cgs
Temperature	8,611±293 K
Rotational velocity (v sin i)	149 km/s
Age	250 Myr
Other designations
	ψ2 Psc, 79 Piscium, BD+19° 185, HD 6695, HIP 5310, HR 328, SAO 74506
Database references
SIMBAD	data

Psi² Piscium (ψ² Piscium) is a white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.56.^[2] Based upon an annual parallax shift of 8.66 mas as seen from Earth,^[1] it is located about 380 light years from the Sun. It has a peculiar velocity of 14.6±2.9 km/s, indicating it is a runaway star.^[9]

This is a suspected binary star system,^[10] with a companion star at an angular separation of 0.357±0.002 arc seconds along a position angle of 174.99°±0.30° from the primary, as of 2008. This corresponds to a projected separation of 16.88±0.62 AU.^[11] The brighter component is an A-type main sequence star with a stellar classification of A3 V.^[3] The system is a source of X-ray emission with a luminosity of 143.9×10²⁰ W, which is most likely originating from the cooler companion since A-type main sequence stars are not expected to be magnetically active.^[12]

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^ ^a ^b ^c ^d Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
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^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference David2015 was invoked but never defined (see the help page).
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^ Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^ Cite error: The named reference DeRosa2012 was invoked but never defined (see the help page).
^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).

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[Hog2000-2] Cite error: The named reference Hog2000 was invoked but never defined (see the help page).

[Zorec2012-3] Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).

[deBruijne2012-4] Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).

[Anderson2012-5] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[David2015-6] Cite error: The named reference David2015 was invoked but never defined (see the help page).

[aaa367_521-7] Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).

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

[Tetzlaff2011-9] Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).

[Eggleton2008-10] Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

[DeRosa2012-11] Cite error: The named reference DeRosa2012 was invoked but never defined (see the help page).

[Schroeder2007-12] Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ψ² Piscium (circled)
Constellation	Pisces
Right ascension	01^h 07^m 57.16387^s^[1]
Declination	+20° 44′ 20.8310″^[1]
Apparent magnitude (V)	+5.56^[2]
Characteristics
Spectral type	A3 V^[3]
B−V color index	+0.12^[2]
Astrometry

Radial velocity (R_v)	−15.2±0.9^[4] km/s
Proper motion (μ)	RA: +86.72^[1] mas/yr Dec.: −82.75^[1] mas/yr
Parallax (π)	21.14 ± 0.77 mas^[1]
Distance	154 ± 6 ly (47 ± 2 pc)
Absolute magnitude (M_V)	+2.19^[5]

Details

Mass	1.82^[6] `M`_☉
Radius	2.0^[7] `R`_☉
Luminosity	13^[3] `L`_☉
Surface gravity (log g)	4.36±0.14^[6] cgs
Temperature	8,611±293^[6] K
Rotational velocity (v sin i)	149^[3] km/s
Age	250^[6] Myr

Other designations
ψ² Psc, 79 Piscium, BD+19° 185, HD 6695, HIP 5310, HR 328, SAO 74506^[8]
Database references
SIMBAD	data