17349+1234 MCY 4 (Rasalhague)
17h 34m 56.06s +12° 33' 36.1" P.A. 260.00 sep 0.3 mag 2.10,5.00 Sp A5III dist. 14.9 pc (48.6 l.y.)
Coord 2000 |
17349+1234 |
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Discov num |
MCY 4 |
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Comp |
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Coord arcsec 2000 |
17 34 56.06 +12 33 36.1 |
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Date first |
1982 |
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Date last |
2021 |
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Obs |
27 |
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Pa first |
243 |
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Pa last |
260 |
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P.A. Now (θ) |
249.6° |
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Sep first |
0.8 |
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Sep last |
0.343 |
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Sep. Now (ρ) |
0.637" |
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Mag pri |
2.10 |
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Mag sec |
5.00 |
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delta mag (ΔM) |
2.9 |
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Spectral class |
A5III (white) |
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Pri motion ra |
+110 |
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Sec motion ra |
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Pri motion dec |
-223 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Common name |
Rasalhague |
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Var name |
NSV9189 Oph |
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Constellation |
Ophiuchus |
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SAO |
102932 |
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HIP |
86032 |
|
Tycho2 |
1000-02508-1 |
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Gaia DR2 |
4493746564376278400 |
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HD |
159561 |
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HR |
6556 |
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GC |
23837 |
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GL |
Gl 681 |
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BD |
BD+12 3252 |
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Bayer |
Alpha Ophiuchi |
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Bayer name |
Alp Oph |
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Flamsteed |
55 Ophiuchi |
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Flamsteed name |
55 Oph |
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FK5 |
656 |
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Distance |
14.9 |
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Distance ly |
48.6 |
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Bayer greek |
α Oph |
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ORBITAL ELEMENTS
Period (P) | 3139.72d (8.6y) | ± 0.28 |
Periastron (T) | 56028.22d (2012.276y) | ± 0.029 |
Semi-major axis (a) | 409.8m | ± 0.3 |
Eccentricity (e) | 0.93912 | ± 0.00013 |
Inclination (i) | 130.679° | ± 0.067 |
Longitude of periastron (ω) | 170.21° | ± 0.23 |
Node (Ω) | 236.86° | ± 0.16 |
Notes | n | |
Reference | CIA2021e | |
Equinox | 2000 | |
Last observation | 2019 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000-01-01 |
241.7 |
0.780 |
2001-01-01 |
238.9 |
0.720 |
2002-01-01 |
235.3 |
0.590 |
2003-01-01 |
228.1 |
0.349 |
2004-01-01 |
269.0 |
0.185 |
2005-01-01 |
253.6 |
0.494 |
2006-01-01 |
248.9 |
0.663 |
2007-01-01 |
245.8 |
0.756 |
2008-01-01 |
243.2 |
0.788 |
2009-01-01 |
240.6 |
0.764 |
2010-01-01 |
237.6 |
0.677 |
2011-01-01 |
233.2 |
0.510 |
2012-01-01 |
218.6 |
0.185 |
2013-01-01 |
259.1 |
0.337 |
2014-01-01 |
251.4 |
0.574 |
2015-01-01 |
247.6 |
0.709 |
2016-01-01 |
244.8 |
0.776 |
2017-01-01 |
242.2 |
0.785 |
2018-01-01 |
239.5 |
0.737 |
2019-01-01 |
236.1 |
0.621 |
2020-01-01 |
230.2 |
0.408 |
2021-01-01 |
287.6 |
0.085 |
2022-01-01 |
255.0 |
0.449 |
2023-01-01 |
249.6 |
0.637 |
2024-01-01 |
246.4 |
0.743 |
2025-01-01 |
243.7 |
0.786 |
2026-01-01 |
241.1 |
0.773 |
2027-01-01 |
238.3 |
0.699 |
2028-01-01 |
234.3 |
0.550 |
2029-01-01 |
224.6 |
0.272 |
2030-01-01 |
262.4 |
0.271 |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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