64 Eridani information

64 Eridani
	; A light curve for S Eridani, adapted from Koen and Eyer (2002)
Observation data; Epoch J2000 Equinox
Constellation	Eridanus
Right ascension	04h 59m 55.73677s
Declination	−12° 32′ 14.6983″
Apparent magnitude (V)	4.77
Characteristics
Spectral type	F0 V
B−V color index	0.266
Variable type	δ Sct
Astrometry
Radial velocity (Rv)	−8.9±4.2 km/s
Proper motion (μ)	RA: +39.67 mas/yr ; Dec.: −87.04 mas/yr
Parallax (π)	12.0106 ± 0.2199 mas
Distance	272 ± 5 ly ; (83 ± 2 pc)
Absolute magnitude (MV)	0.03
Details
Mass	1.52 M☉
Luminosity	80.17 L☉
Surface gravity (log g)	3.37 cgs
Temperature	7,346±250 K
Rotational velocity (v sin i)	212 km/s
Age	644 Myr
Other designations
	64 Eri, S Eri, BD−12° 1047, HD 32045, HIP 23231, HR 1611, SAO 150064
Database references
SIMBAD	data

64 Eridani is a single,^[12] yellow-white hued star in the constellation Eridanus having variable star designation S Eridani. It is faintly visible to the naked eye with an apparent visual magnitude of 4.77.^[3] The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 272 light years.^[7] In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.^[6]

This is an F-type main-sequence star with a stellar classification of F0 V.^[4] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.^[5] It was originally classified, tentatively, as an RR Lyrae variable of type 'c'.^[13]

64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.^[10] This is giving the star an oblate shape with an equatorial bulge; its equatorial radius is 8% larger than its polar radius.^[14] The star is an estimated 644 million years old with 1.5 times the mass of the Sun.^[9] It is radiating 80^[8] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,346 K.^[9]

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^ ^a ^b Cite error: The named reference Rodriguez2001 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
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^ ^a ^b ^c ^d ^e ^f Cite error: The named reference David2015 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
^ "64 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-29.
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^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
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[Koen-1] Cite error: The named reference Koen was invoked but never defined (see the help page).

[vanLeeuwen2007-2] Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[tycho2-3] Cite error: The named reference tycho2 was invoked but never defined (see the help page).

[houk1978-4] Cite error: The named reference houk1978 was invoked but never defined (see the help page).

[Rodriguez2001-5] Cite error: The named reference Rodriguez2001 was invoked but never defined (see the help page).

[deBruijne2012-6] Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).

[dr2-7] Cite error: The named reference dr2 was invoked but never defined (see the help page).

[Anderson2012-8] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[David2015-9] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference David2015 was invoked but never defined (see the help page).

[Royer2007-10] Cite error: The named reference Royer2007 was invoked but never defined (see the help page).

[SIMBAD-11] "64 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-29.

[Eggleton2008-12] Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

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

[belle2012-14] Cite error: The named reference belle2012 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox
A light curve for S Eridani, adapted from Koen and Eyer (2002)^[1]
Constellation	Eridanus
Right ascension	04^h 59^m 55.73677^s^[2]
Declination	−12° 32′ 14.6983″^[2]
Apparent magnitude (V)	4.77^[3]
Characteristics
Spectral type	F0 V^[4]
B−V color index	0.266^[3]
Variable type	δ Sct^[5]
Astrometry

Radial velocity (R_v)	−8.9±4.2^[6] km/s
Proper motion (μ)	RA: +39.67^[2] mas/yr Dec.: −87.04^[2] mas/yr
Parallax (π)	12.0106 ± 0.2199 mas^[7]
Distance	272 ± 5 ly (83 ± 2 pc)
Absolute magnitude (M_V)	0.03^[8]

Details

Mass	1.52^[9] `M`_☉
Luminosity	80.17^[8] `L`_☉
Surface gravity (log g)	3.37^[9] cgs
Temperature	7,346±250^[9] K
Rotational velocity (v sin i)	212^[10] km/s
Age	644^[9] Myr

Other designations
64 Eri, S Eri, BD−12° 1047, HD 32045, HIP 23231, HR 1611, SAO 150064^[11]
Database references
SIMBAD	data

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