Delta Cassiopeiae

δ Cassiopeiae
	; Lokasi δ Cassiopeiae (dilingkari)
Data pengamatan; Epos J2000 Ekuinoks J2000
Rasi bintang	Cassiopeia
Asensio rekta	01j 25m 48,95147d
Deklinasi	+60° 14′ 07,0225″
Magnitudo tampak (V)	2,68
Ciri-ciri
Kelas spektrum	A5 IV
Indeks warna U−B	+0,13
Indeks warna B−V	+0,13
Jenis variabel	Algol
Astrometri
Kecepatan radial (Rv)	−6,7 km/s
Gerak diri (μ)	RA: 296,57 mdb/thn ; Dek.: –49,22 mdb/thn
Paralaks (π)	32,81±0,14 mdb
Jarak	99,4 ± 0,4 tc ; (30,5 ± 0,1 pc)
Magnitudo mutlak (MV)	+0,28
Detail
Massa	2,49 M☉
Radius	3,90 R☉
Luminositas	72,88 L☉
Suhu	7.980 K
Kecepatan rotasi (v sin i)	123 km/s
Usia	6,0×108 tahun
Penamaan lain
	Ruchbah, Ksora, Rucba, Rucbar, 37 Cassiopeiae, BD+59°248, FK5 48, HD 8538, HIP 6686, HR 403, SAO 22268, WDS J01258+6014A.
Referensi basis data
SIMBAD	data

Delta Cassiopeiae (δ Cas / δ Cassiopeiae) adalah salah satu bintang di rasi Cassiopeia. Delta Cassiopeiae merupakan bintang ganda dengan periode orbit 759 hari. Bintang ini memilikki magnitudo sekitar +2.68 - +2.74. Delta Cassiopeia berada pada jarak 99 tahun cahaya dari Bumi.

Etimologi

Ruchbah adalah nama tradisional dari bintang ini, berasal dari bahasa Arabركبة rukbah yang berarti "lutut", merefleksikan posisi bintang ini pada lutut sang ratu. Kadang-kadang bintang ini disebut juga dengan nama Ksora. Nama lain dari para astronom terdahulu adalah :

nama lain	asal bahasa	arti
閣道三 / Gédàosān	China	bintang ketiga pada rasi Lorong Terbang^[12]
奎西南大星 / Gédàonándàxīng	China	bintang besar di selatan rasi Lorong Terbang^[13]
Quae in genibus (Almagest)	Latin	yang berada di lutut (sang ratu)^[14]

Selain rasi Cassiopeia, bintang ini juga merupakan anggota dari berbagai rasi atau asterisma berikut :

nama rasi / asterisma	asal	arti	anggota lainnya
閣道	China	Lorong Terbang	ι Cas, ε Cas, θ Cas, ν Cas, ο Cas ,
W		huruf W	β Cas, α Cas, γ Cas, ε Cas

The Sun would appear close to Cassiopeia from Alpha Centauri

Referensi

^ ^a ^b ^c ^d ^e van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1  , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 Note: see VizieR catalogue I/311.
^ ^a ^b ^c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
^ Gray, R. O.; Garrison, R. F. (1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
^ Malkov, O. Yu.; et al. (February 2006), "A catalogue of eclipsing variables", Astronomy and Astrophysics, 446 (2): 785–789, Bibcode:2006A&A...446..785M, doi:10.1051/0004-6361:20053137
^ Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Washington, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W
^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
^ ^a ^b ^c ^d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052  . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
^ ^a ^b Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, arXiv:astro-ph/0609555  , Bibcode:2007ApJ...660.1556R, doi:10.1086/509912
^ Bakich, Michael E. (1995), The Cambridge guide to the constellations, Cambridge University Press, hlm. 170, ISBN 0-521-44921-9
^ Allen, Richard Hinckley (1899), Star-names and their meanings, G.E. Stechert, hlm. 148
^ "V* del Cas -- Variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, diakses tanggal 2010-02-21
^ salah satu rasi bintang menurut bangsa Cina
^ http://www.chinese-tools.com/tools/sinograms.html
^ http://www.atlascoelestis.com/alsufi%2010.htm

Artikel bertopik bintang ini adalah sebuah rintisan. Anda dapat membantu Wikipedia dengan mengembangkannya.

[aaa474_2_653-1] van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1  , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 Note: see VizieR catalogue I/311.

[clpl4_99-2] Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J

[gray-3] Gray, R. O.; Garrison, R. F. (1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.

[aaa446_2_785-4] Malkov, O. Yu.; et al. (February 2006), "A catalogue of eclipsing variables", Astronomy and Astrophysics, 446 (2): 785–789, Bibcode:2006A&A...446..785M, doi:10.1051/0004-6361:20053137

[wilson1953-5] Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Washington, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W

[Eggen1998-6] Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.

[zorec-7] Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052  . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.

[apj660_2_1556-8] Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, arXiv:astro-ph/0609555  , Bibcode:2007ApJ...660.1556R, doi:10.1086/509912

[bakich1995-9] Bakich, Michael E. (1995), The Cambridge guide to the constellations, Cambridge University Press, hlm. 170, ISBN 0-521-44921-9

[hinkley1899-10] Allen, Richard Hinckley (1899), Star-names and their meanings, G.E. Stechert, hlm. 148

[SIMBAD-11] "V* del Cas -- Variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, diakses tanggal 2010-02-21

[12] salah satu rasi bintang menurut bangsa Cina

[13] ttp://www.chinese-tools.com/tools/sinograms.html

[14] ttp://www.atlascoelestis.com/alsufi%2010.htm

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Data pengamatan Epos J2000 Ekuinoks J2000
Lokasi δ Cassiopeiae (dilingkari)
Rasi bintang	Cassiopeia
Asensio rekta	01^j 25^m 48,95147^d^[1]
Deklinasi	+60° 14′ 07,0225″^[1]
Magnitudo tampak (V)	2,68^[2]
Ciri-ciri
Kelas spektrum	A5 IV^[3]
Indeks warna U−B	+0,13^[2]
Indeks warna B−V	+0,13^[2]
Jenis variabel	Algol^[4]
Astrometri

Kecepatan radial (R_v)	−6,7^[5] km/s
Gerak diri (μ)	RA: 296,57^[1] mdb/thn Dek.: –49,22^[1] mdb/thn
Paralaks (π)	32,81±0,14^[1] mdb
Jarak	99,4 ± 0,4 tc (30,5 ± 0,1 pc)
Magnitudo mutlak (M_V)	+0,28^[6]

Detail

Massa	2,49^[7] M_☉
Radius	3,90^[8] R_☉
Luminositas	72,88^[7] L_☉
Suhu	7.980^[7] K
Kecepatan rotasi (v sin i)	123^[7] km/s
Usia	6,0×10⁸^[8] tahun

Penamaan lain
Ruchbah, Ksora,^[9] Rucba, Rucbar,^[10] 37 Cassiopeiae, BD+59°248, FK5 48, HD 8538, HIP 6686, HR 403, SAO 22268, WDS J01258+6014A.^[11]
Referensi basis data
SIMBAD	data