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 |
|
Discov num |
CHR 182 |
|
Comp |
|
|
Coord arcsec 2000 |
17 22 00.58 -24 59 58.2 |
|
| Date first |
1992 |
|
Date last |
2021 |
|
Obs |
11 |
|
| Pa first |
234 |
|
Pa last |
54.1 |
|
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 |
|
Sec motion ra |
|
|
| Pri motion dec |
-020 |
|
Sec motion dec |
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|
| Notes |
O
(Orbital solution) |
|
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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