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 |
|
Discov num |
MCY 4 |
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Comp |
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Coord arcsec 2000 |
17 34 56.06 +12 33 36.1 |
|
| Date first |
1982 |
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Date last |
2021 |
|
Obs |
27 |
|
| Pa first |
243 |
|
Pa last |
260 |
|
P.A. Now (θ) |
249.6° |
|
| Sep first |
0.8 |
|
Sep last |
0.343 |
|
Sep. Now (ρ) |
0.637" |
|
| Mag pri |
2.10 |
|
Mag sec |
5.00 |
|
delta mag (ΔM) |
2.9 |
|
Spectral class |
A5III (white) |
|
| Pri motion ra |
+110 |
|
Sec motion ra |
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| Pri motion dec |
-223 |
|
Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Rasalhague |
|
Var name |
NSV9189 Oph |
|
Constellation |
Ophiuchus |
|
SAO |
102932 |
|
| HIP |
86032 |
|
Tycho2 |
1000-02508-1 |
|
Gaia DR2 |
4493746564376278400 |
|
HD |
159561 |
|
| HR |
6556 |
|
GC |
23837 |
|
GL |
Gl 681 |
|
BD |
BD+12 3252 |
|
| Bayer |
Alpha Ophiuchi |
|
Bayer name |
Alp Oph |
|
Flamsteed |
55 Ophiuchi |
|
Flamsteed name |
55 Oph |
|
| FK5 |
656 |
|
Distance |
14.9 |
|
Distance ly |
48.6 |
|
Bayer greek |
α Oph |
|
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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