16198+2647 A 225 (HD 147251)
16h 19m 49.63s +26° 46' 38.7" P.A. 101.00 sep 0.1 mag 10.04,9.79 Sp G5 dist. 129.37 pc (422 l.y.)
| Coord 2000 |
16198+2647 |
|
Discov num |
A 225 |
|
Comp |
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Coord arcsec 2000 |
16 19 49.63 +26 46 38.7 |
|
| Date first |
1901 |
|
Date last |
2007 |
|
Obs |
35 |
|
| Pa first |
107 |
|
Pa last |
100.8 |
|
P.A. Now (θ) |
122.6° |
|
| Sep first |
0.2 |
|
Sep last |
0.053 |
|
Sep. Now (ρ) |
0.182" |
|
| Mag pri |
10.04 |
|
Mag sec |
9.79 |
|
delta mag (ΔM) |
0.25 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
-021 |
|
Sec motion ra |
|
|
| Pri motion dec |
-097 |
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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
| Name |
HD 147251 |
|
Constellation |
Corona Borealis |
|
SAO |
84305 |
|
HIP |
79999 |
|
| Tycho2 |
2051-00593-1 |
|
Gaia DR2 |
1303718222983012480 |
|
HD |
147251 |
|
ADS |
10007 |
|
| BD |
BD+27 2622 |
|
Distance |
129.37 |
|
Distance ly |
422 |
|
ORBITAL ELEMENTS
| Period (P) | 43.34y | ± 1.68 |
Periastron (T) | 2005.9y | ± 0.54 |
Semi-major axis (a) | 0.129a | ± 0.003 |
| Eccentricity (e) | 0.489 | ± 0.038 |
Inclination (i) | 114.4° | ± 1 |
Longitude of periastron (ω) | 183.1° | ± 2.3 |
| Node (Ω) | 117.5° | ± 1 |
Notes | n | |
Reference | Doc2008a | |
| Equinox | 2000 | |
Last observation | 2005 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
57.5 |
0.053 |
| 2001 |
35.2 |
0.043 |
| 2002 |
5.9 |
0.041 |
| 2003 |
339.2 |
0.047 |
| 2004 |
320.3 |
0.056 |
| 2005 |
306.7 |
0.064 |
| 2006 |
295.1 |
0.066 |
| 2007 |
282.6 |
0.060 |
| 2008 |
266.0 |
0.050 |
| 2009 |
240.9 |
0.041 |
| 2010 |
208.4 |
0.039 |
| 2011 |
181.1 |
0.048 |
| 2012 |
164.0 |
0.062 |
| 2013 |
153.4 |
0.077 |
| 2014 |
146.4 |
0.092 |
| 2015 |
141.4 |
0.107 |
| 2016 |
137.5 |
0.120 |
| 2017 |
134.4 |
0.133 |
| 2018 |
131.8 |
0.144 |
| 2019 |
129.5 |
0.154 |
| 2020 |
127.6 |
0.163 |
| 2021 |
125.8 |
0.171 |
| 2022 |
124.1 |
0.177 |
| 2023 |
122.6 |
0.182 |
| 2024 |
121.1 |
0.186 |
| 2025 |
119.7 |
0.189 |
| 2026 |
118.3 |
0.191 |
| 2027 |
117.0 |
0.192 |
| 2028 |
115.6 |
0.192 |
| 2029 |
114.3 |
0.190 |
| 2030 |
112.9 |
0.187 |
|
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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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