Eta Piscium

Eta Piscium
Location of η Piscium(circled)


Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Pisces
Right ascension	01^h 31^m 29.0^s
Declination	+15° 20' 45"
Apparent magnitude (V)	+3.62
Distance	294 ly (90 pc)
Spectral type	G7IIIa
Other designations
η Piscium, η Psc, Eta Psc, 99 Piscium, BD+14 231, CCDM J01315+1521AB, FK5 50, GC 1839, HD 9270, HIP 7097, HR 437, IDS 01261+1450, PPM 117418, SAO 92484, WDS J01315+1521AB.

Eta Piscium (Eta Psc, η Piscium, η Psc), also named Alpherg,^[1] is the brightest star in the constellation Pisces. Eta Piscium is located at a distance of about 294 light years from Earth, and shines at magnitude +3.62. It is of Spectral type G7 III.

The total luminosity of this star is 316 times that of the Sun, while its surface temperature is 4930 kelvin. The star has a radius of 26 ± 2^[2] solar radii, while its mass is 3.5 to 4 solar masses.

Eta Piscium has a faint companion star with a separation of about 1".

Name and etymology

The star had an obscure Babylonian name Kullat Nūnu−the latter being the Babylonian word for fish and the former "Kullat" referring to either a bucket or the cord that ties the fish together.^[3]
In Chinese, 右更 (Yòu Gèng), meaning Official in Charge of the Pasturing, refers to an asterism consisting of η Piscium, ρ Piscium, π Piscium, ο Piscium and 104 Piscium. Consequently, η Piscium itself is known as 右更二 (Yòu Gèng èr, English: the Second Star of Official in Charge of the Pasturing.)^[4]

References

↑ "Pisces Constellation: Facts About the Fishes". Retrieved 29 September 2016.
↑ Nordgren, Tyler E.; et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal, 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114
↑ Allen, Richard Hinckley, (1963) [1899]. Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc. pp. 328–29. ISBN 0-486-21079-0.
↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日

External links

Eta Psc

Stars of Pisces

Bayer	α (Alrescha) β (Fum al Samakah) γ δ ε ζ η (Kullat Nunu) θ ι κ λ μ ν ξ ο (Torcularis Septentrionalis) π ρ σ τ υ φ χ ψ¹ ψ² ψ³ ω

Flamsteed	1 2 3 5 7 9 11 12 13 14 15 16 20 21 22 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 51 52 53 54 55 57 58 59 60 61 62 64 65 66 67 68 70 72 73 75 76 77 78 80 82 87 88 89 91 92 94 95 96 97 100 101 103 104 105 107 109 112 4 Cet 5 Cet

Variable	R Y RU RV RZ SS SV SZ TX (19) TY UV UZ VY (3 Ari) VZ WW WX WZ XZ AO AQ AR AY AZ BE BK BR BT BU CY DT DV DZ EO FL GU

HR	2 29 67 69 94 107 141 145 161 222 243 259 276 277 303 341 344 356 371 374 397 407 426 450 457 484 527 8730 8734 8735 8738 8751 8776 8785 8897 8983 9015

HD	26 1502 2358 4203 4313 5418 5891 7107 8574 8733 9496 9986 10262 12730 217590 217786 218566 219188 224690

Gliese	GJ 1286 GJ 3076 GJ 3128

Other	Bond's flare star CS 22949-037 Feige 110 G 29-38 2MASS 0036+1821 NGC 33 NGC 46 PG 0014+067 PG 0122+200 PSR J0030+0451 1RXS J232953.9+062814 SIMP J013656.5+093347 van Maanen 2 WASP-28 WASP-32

List

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