17220-2500 CHR 182 (The Oph)
17h 22m 00.58s -24° 59' 58.2" P.A. 54.00 sep 0.2 mag 3.40,6.20 Sp B2IV dist. 133.69 pc (436.1 l.y.)
Coord 2000 |
17220-2500 |
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Discov num |
CHR 182 |
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Comp |
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Coord arcsec 2000 |
17 22 00.58 -24 59 58.2 |
|
Date first |
1992 |
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Date last |
2021 |
|
Obs |
11 |
|
Pa first |
234 |
|
Pa last |
54.1 |
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P.A. Now (θ) |
54.9° |
|
Sep first |
0.2 |
|
Sep last |
0.156 |
|
Sep. Now (ρ) |
0.119" |
|
Mag pri |
3.40 |
|
Mag sec |
6.20 |
|
delta mag (ΔM) |
2.8 |
|
Spectral class |
B2IV (blue-white) |
|
Pri motion ra |
-004 |
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Sec motion ra |
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Pri motion dec |
-020 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
The Oph |
|
Constellation |
Ophiuchus |
|
SAO |
185320 |
|
HIP |
84970 |
|
Tycho2 |
6829-00577-1 |
|
Gaia DR2 |
4110730486344995456 |
|
HD |
157056 |
|
HR |
6453 |
|
GC |
23451 |
|
CD |
CD-2413292 |
|
CP |
CP-24 5876 |
|
Bayer |
Theta Ophiuchi |
|
Bayer name |
The Oph |
|
Flamsteed |
42 Ophiuchi |
|
Flamsteed name |
42 Oph |
|
FK5 |
644 |
|
Distance |
133.69 |
|
Distance ly |
436.1 |
|
Bayer greek |
θ Oph |
|
ORBITAL ELEMENTS
Period (P) | 28.21y | |
Periastron (T) | 1995.29y | |
Semi-major axis (a) | 0.229a | |
Eccentricity (e) | 0.4 | |
Inclination (i) | 89.2° | |
Longitude of periastron (ω) | 47° | |
Node (Ω) | 54.4° | |
Notes | | |
Reference | Tok2021f | |
Equinox | | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
234.0 |
0.195 |
2001 |
234.2 |
0.231 |
2002 |
234.3 |
0.256 |
2003 |
234.5 |
0.272 |
2004 |
234.6 |
0.280 |
2005 |
234.7 |
0.281 |
2006 |
234.8 |
0.276 |
2007 |
234.9 |
0.265 |
2008 |
235.0 |
0.249 |
2009 |
235.2 |
0.228 |
2010 |
235.4 |
0.203 |
2011 |
235.6 |
0.175 |
2012 |
236.0 |
0.143 |
2013 |
236.5 |
0.108 |
2014 |
237.6 |
0.072 |
2015 |
241.2 |
0.033 |
2016 |
22.6 |
0.007 |
2017 |
50.0 |
0.045 |
2018 |
52.3 |
0.082 |
2019 |
53.2 |
0.116 |
2020 |
53.7 |
0.142 |
2021 |
54.1 |
0.156 |
2022 |
54.4 |
0.150 |
2023 |
54.9 |
0.119 |
2024 |
56.0 |
0.063 |
2025 |
218.5 |
0.008 |
2026 |
232.8 |
0.077 |
2027 |
233.6 |
0.137 |
2028 |
234.0 |
0.187 |
2029 |
234.2 |
0.224 |
2030 |
234.3 |
0.251 |
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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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