61 Cygni

61 Cygni
	; Expanded view of the star field around 61 Cygni. This system is located at the end of the arrow above.
Data pengamatan; Epos J2000.0 Ekuinoks J2000.0
Rasi bintang	Cygnus
	61 Cygni A
Asensio rekta	21j 06m 53.9434d
Deklinasi	+38° 44′ 57.898″
Magnitudo semu (V)	5.21
	61 Cygni B
Asensio rekta	21j 06m 55.2648d"SIMBAD Query Result: NSV 13546 -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2007-07-15. (61 Cygni B)</ref>
Deklinasi	+38° 44′ 31.400″
Magnitudo semu (V)	6.03
Ciri-ciri
Kelas spektrum	K5V / K7V
Indeks warna U−B	+1.155 / +1.242
Indeks warna B−V	+1.139 / +1.320
Jenis variabel	A: BY Draconis; B: Flare star
Astrometri
Kecepatan radial (Rv)	-64.3/-63.5 km/s
Gerak diri (μ)	RA: 4156.93/; 4109.17 mdb/thn ; Dek.: 3259.39/; 3144.17 mdb/thn
Paralaks (π)	287,18±1,51 mdb
Jarak	11,36 ± 0,06 tc ; (3,48 ± 0,02 pc)
Magnitudo mutlak (MV)	7.48/8.33
Detail
61 Cygni A
Massa	0.70 M☉
Radius	0.665 ± 0.005 R☉
Luminositas	0.215 L☉
Gravitasi permukaan (log g)	4.40
Suhu	4,526 ± 66 K
Metalisitas	[Fe/H] = -0.20
Rotasi	35.37 d
61 Cygni B
Massa	0.63 M☉
Radius	0.595 ± 0.008 R☉
Luminositas	0.15 L☉
Gravitasi permukaan (log g)	4.20
Suhu	4,077 ± 59 K
Metalisitas	[Fe/H] = -0.27
Rotasi	37.84 d
Orbit bintang ganda visual
Bintang sekunder	61 Cygni B
Periode (P)	678 ± 34 tahun
Sumbu semi-mayor (a)	24.272 ± 0.592"
Eksentrisitas (e)	0.49 ± 0.03
Inklinasi (i)	51 ± 2°
Bujur node (Ω)	178 ± 2°
Epoch periastron (T)	1709 ± 16
Penamaan lain
	61 Cyg A/B GJ 820 A/B, Struve 2758 A/B, ADS 14636 A/B, GCTP 5077.00 A/B 61 Cyg A V1803 Cyg, HD 201091, HIP 104214, HR 8085, BD+38°4343, LHS 62 61 Cyg B HD 201092, HIP 104217, HR 8086, BD+38°4344, LHS 63

61 Cygni merupakan bintang ganda di rasi Cygnus. Bintang ini terdiri dari dua bintang katai tipe K (K-type dwarf) yang saling mengorbit. 61 Cygni adalah salah satu bintang yang menarik untuk diteliti oleh para astronom. Pada tahun 1838, Friedrich Wilhelm Bessel mengukur jarak antara keberadaanya dengan Bumi, dan menghasil angka sekitar 10.4 tahun cahaya, lebih dekat daripada hasil yang diperoleh pada pengujian terakhir (11.4 tahun cahaya).^[8] Setelah berbagai pengujian pada abad keduabelas, beberapa pelanet dilaporkan mengelilingi bintang ini, tetapi sejauh ini pernyataan tersebut belum teruji^[9]^[10]^[11] To date, no planets have been confirmed in this system and all of the past claims are now considered spurious.

Etimologi

Bintang ini disebut juga Bintang Bessel (Bessel's Star)^[12] atau Piazzi's Flying Star,^[13]

Selain rasi Cygnus, bintang ini juga merupakan anggota dari kelompok berikut:

nama rasi / asterisma / kelompok	asal	arti	anggota lainnya
61 Cygni Group^[14]			(antara lain): 31 Aql, HD 131111, HD 3443, β Col, π Men, HD 142, HD 55526, 14 Tau, HD 150275, 68 Vir, HD 53501

Referensi

^ ^a ^b Blanco, C.; Marilli, E.; Catalano, S. (1979). "Photoelectric observations of stars with variable H and K emission components. III". Astronomy and Astrophysics Supplement Series. 36: 297–306. Diakses tanggal 2007-02-04.
^ ^a ^b Staff (June 8, 2007). "List of the Nearest 100 Stellar Systems". Research Consortium on Nearby Stars, Georgia State University. Diakses tanggal 2007-07-15.
^ ^a ^b Kervella, P.; Mérand, A.; Pichon, B.; Thévenin, F.; Heiter, U.; Bigot, L.; Ten Brummelaar, T. A.; McAlister, H. A.; Ridgway, S. T.; Turner, N.; Sturmann, J.; Sturmann, L.; Goldfinger, P. J.; Farrington, C. (2008). "The radii of the nearby K5V and K7V stars 61 Cygni A & B. CHARA/FLUOR interferometry and CESAM2k modeling". Astronomy and Astrophysics. 488 (2): 667–674. doi:10.1051/0004-6361:200810080.
^ ^a ^b ^c ^d Luck, R. Earle; Heiter, Ulrike (2005). "Stars within 15 Parsecs: Abundances for a Northern Sample". The Astronomical Journal. 129 (2): 1063–1083. doi:10.1086/427250. Diakses tanggal 2007-07-17.
^ ^a ^b van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. doi:10.1088/0004-637X/694/2/1085.
^ ^a ^b Böhm-Vitense, Erika (2007). "Chromospheric Activity in G and K Main-Sequence Stars, and What It Tells Us about Stellar Dynamos". The Astrophysical Journal. 657 (1): 486–493. doi:10.1086/510482.
^ "SIMBAD Query Result: ADS 14636 AB -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2009-04-01. (61 Cygni)
^ Frommert, Hartmut; Kronberg, Christine. "Friedrich Wilhelm Bessel". Students for the Exploration and Development of Space. Diakses tanggal 2009-04-03.
^ Walker, G. A. H.; Walker, A. R.; Irwin, A. W.; Larson, A. M.; Yang, S. L. S.; Richardson, D. C (1995). "A search for Jupiter-mass companions to nearby stars". Icarus. 116 (2): 359–375. doi:10.1006/icar.1995.1130.
^ Cumming, A.; Marcy, G. W.; Butler, R. P. (1999). "The Lick planet search: detectability and mass thresholds". Astrophysical Journal. 526: 890–915. doi:10.1086/308020.
^ Wittenmyer, R. A.; Endl, M.; Cochran, W.D.; Hatzes, A.; Walker, G. A. H.; Yang, S. L. S.; Paulson, D. B. (2006). "Detection limits from the McDonald Observatory planet search program". Astronomical Journal. 132: 177–188. doi:10.1086/504942.
^ Pannekoek, Anton (1989). A History of Astronomy. Courier Dover Publications. hlm. 343. ISBN 0486659941.
^ Hirshfeld, Alan (2001). Parallax: The Race to Measure the Cosmos. Macmillan. ISBN 0716737116.
^ Eggen, O. J. (1959). "White dwarf members of the 61 Cygni group". The Observatory. 79: 135–39. Diakses tanggal 2007-07-17. – Gives space velocity components of U=+94, V=-53 and W=-7 for HD 201091/2.

Pranala luar

"61 Cygni 2". SolStation. Diakses tanggal 2007-07-16.
Kaler, James B. "61 Cygni". University of Illinois at Urbana-Champaign. Diarsipkan dari versi asli tanggal 2007-07-07. Diakses tanggal 2007-07-16.

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

[aass36-1] Blanco, C.; Marilli, E.; Catalano, S. (1979). "Photoelectric observations of stars with variable H and K emission components. III". Astronomy and Astrophysics Supplement Series. 36: 297–306. Diakses tanggal 2007-02-04.

[RECONS-2] Staff (June 8, 2007). "List of the Nearest 100 Stellar Systems". Research Consortium on Nearby Stars, Georgia State University. Diakses tanggal 2007-07-15.

[aaa488-3] Kervella, P.; Mérand, A.; Pichon, B.; Thévenin, F.; Heiter, U.; Bigot, L.; Ten Brummelaar, T. A.; McAlister, H. A.; Ridgway, S. T.; Turner, N.; Sturmann, J.; Sturmann, L.; Goldfinger, P. J.; Farrington, C. (2008). "The radii of the nearby K5V and K7V stars 61 Cygni A & B. CHARA/FLUOR interferometry and CESAM2k modeling". Astronomy and Astrophysics. 488 (2): 667–674. doi:10.1051/0004-6361:200810080.

[apj129-4] Luck, R. Earle; Heiter, Ulrike (2005). "Stars within 15 Parsecs: Abundances for a Northern Sample". The Astronomical Journal. 129 (2): 1063–1083. doi:10.1086/427250. Diakses tanggal 2007-07-17.

[apj694-5] van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. doi:10.1088/0004-637X/694/2/1085.

[apj657-6] Böhm-Vitense, Erika (2007). "Chromospheric Activity in G and K Main-Sequence Stars, and What It Tells Us about Stellar Dynamos". The Astrophysical Journal. 657 (1): 486–493. doi:10.1086/510482.

[simbadAB-7] "SIMBAD Query Result: ADS 14636 AB -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2009-04-01. (61 Cygni)

[Bessel-8] Frommert, Hartmut; Kronberg, Christine. "Friedrich Wilhelm Bessel". Students for the Exploration and Development of Space. Diakses tanggal 2009-04-03.

[Walker1995-9] Walker, G. A. H.; Walker, A. R.; Irwin, A. W.; Larson, A. M.; Yang, S. L. S.; Richardson, D. C (1995). "A search for Jupiter-mass companions to nearby stars". Icarus. 116 (2): 359–375. doi:10.1006/icar.1995.1130.

[Cumming1999-10] Cumming, A.; Marcy, G. W.; Butler, R. P. (1999). "The Lick planet search: detectability and mass thresholds". Astrophysical Journal. 526: 890–915. doi:10.1086/308020.

[Wittenmyer2006-11] Wittenmyer, R. A.; Endl, M.; Cochran, W.D.; Hatzes, A.; Walker, G. A. H.; Yang, S. L. S.; Paulson, D. B. (2006). "Detection limits from the McDonald Observatory planet search program". Astronomical Journal. 132: 177–188. doi:10.1086/504942.

[12] Pannekoek, Anton (1989). A History of Astronomy. Courier Dover Publications. hlm. 343. ISBN 0486659941.

[hirshfeld-13] Hirshfeld, Alan (2001). Parallax: The Race to Measure the Cosmos. Macmillan. ISBN 0716737116.

[14] Eggen, O. J. (1959). "White dwarf members of the 61 Cygni group". The Observatory. 79: 135–39. Diakses tanggal 2007-07-17. – Gives space velocity components of U=+94, V=-53 and W=-7 for HD 201091/2.

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Data pengamatan Epos J2000.0 Ekuinoks J2000.0
Expanded view of the star field around 61 Cygni. This system is located at the end of the arrow above.
Rasi bintang	Cygnus
61 Cygni A
Asensio rekta	21^j 06^m 53.9434^d
Deklinasi	+38° 44′ 57.898″
Magnitudo semu (V)	5.21
61 Cygni B
Asensio rekta	21^j 06^m 55.2648^d"SIMBAD Query Result: NSV 13546 -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2007-07-15. (61 Cygni B)</ref>
Deklinasi	+38° 44′ 31.400″
Magnitudo semu (V)	6.03
Ciri-ciri
Kelas spektrum	K5V / K7V
Indeks warna U−B	+1.155 / +1.242^[1]
Indeks warna B−V	+1.139 / +1.320^[1]
Jenis variabel	A: BY Draconis B: Flare star
Astrometri

Kecepatan radial (R_v)	-64.3/-63.5 km/s
Gerak diri (μ)	RA: 4156.93/ 4109.17 mdb/thn Dek.: 3259.39/ 3144.17 mdb/thn
Paralaks (π)	287,18±1,51 mdb
Jarak	11,36 ± 0,06 tc (3,48 ± 0,02 pc)
Magnitudo mutlak (M_V)	7.48/8.33

Detail
61 Cygni A
Massa	0.70^[2] M_☉
Radius	0.665 ± 0.005^[3] R_☉
Luminositas	0.215 L_☉
Gravitasi permukaan (log g)	4.40^[4]
Suhu	4,526 ± 66^[5] K
Metalisitas	[Fe/H] = -0.20^[4]
Rotasi	35.37 d^[6]
61 Cygni B
Massa	0.63^[2] M_☉
Radius	0.595 ± 0.008^[3] R_☉
Luminositas	0.15 L_☉
Gravitasi permukaan (log g)	4.20^[4]
Suhu	4,077 ± 59^[5] K
Metalisitas	[Fe/H] = -0.27^[4]
Rotasi	37.84 d^[6]
Orbit bintang ganda visual
Bintang sekunder	61 Cygni B
Periode (P)	678 ± 34 tahun
Sumbu semi-mayor (a)	24.272 ± 0.592"
Eksentrisitas (e)	0.49 ± 0.03
Inklinasi (i)	51 ± 2°
Bujur node (Ω)	178 ± 2°
Epoch periastron (T)	1709 ± 16
Penamaan lain
61 Cyg A/B GJ 820 A/B, Struve 2758 A/B, ADS 14636 A/B, GCTP 5077.00 A/B ^[7] 61 Cyg A V1803 Cyg, HD 201091, HIP 104214, HR 8085, BD+38°4343, LHS 62 61 Cyg B HD 201092, HIP 104217, HR 8086, BD+38°4344, LHS 63