21511+6650 HU 972 (HD 208074)
21h 51m 04.93s +66° 50' 14.7" P.A. 255.00 sep 0.3 mag 9.09,9.54 Sp F8IV/V dist. 162.07 pc (528.67 l.y.)
| Coord 2000 |
21511+6650 |
|
Discov num |
HU 972 |
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Comp |
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Coord arcsec 2000 |
21 51 04.93 +66 50 14.7 |
|
| Date first |
1904 |
|
Date last |
2008 |
|
Obs |
26 |
|
| Pa first |
303 |
|
Pa last |
255.1 |
|
P.A. Now (θ) |
255.1° |
|
| Sep first |
0.3 |
|
Sep last |
0.341 |
|
Sep. Now (ρ) |
0.341" |
|
| Mag pri |
9.09 |
|
Mag sec |
9.54 |
|
delta mag (ΔM) |
0.45 |
|
Spectral class |
F8IV/V (yellow-white) |
|
| Pri motion ra |
-002 |
|
Sec motion ra |
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|
| Pri motion dec |
-026 |
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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 208074 |
|
Constellation |
Cepheus |
|
SAO |
19680 |
|
HIP |
107855 |
|
| Tycho2 |
4274-01174-1 |
|
HD |
208074 |
|
ADS |
15398 |
|
BD |
BD+66 1446 |
|
| Distance |
162.07 |
|
Distance ly |
528.67 |
|
ORBITAL ELEMENTS
| Period (P) | 150.81y | |
Periastron (T) | 1963.65y | |
Semi-major axis (a) | 0.321a | |
| Eccentricity (e) | 0.633 | |
Inclination (i) | 47.3° | |
Longitude of periastron (ω) | 276.1° | |
| Node (Ω) | 189.1° | |
Notes | n | |
Reference | Hrt2014b | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
244.2 |
0.313 |
| 2001 |
245.5 |
0.315 |
| 2002 |
246.8 |
0.317 |
| 2003 |
248.1 |
0.318 |
| 2004 |
249.3 |
0.320 |
| 2005 |
250.6 |
0.322 |
| 2006 |
251.8 |
0.324 |
| 2007 |
253.1 |
0.325 |
| 2008 |
254.3 |
0.327 |
| 2009 |
255.5 |
0.328 |
| 2010 |
256.7 |
0.330 |
| 2011 |
257.8 |
0.331 |
| 2012 |
259.0 |
0.333 |
| 2013 |
260.2 |
0.334 |
| 2014 |
261.3 |
0.335 |
| 2015 |
262.5 |
0.337 |
| 2016 |
263.6 |
0.338 |
| 2017 |
264.7 |
0.339 |
| 2018 |
265.9 |
0.340 |
| 2019 |
267.0 |
0.341 |
| 2020 |
268.1 |
0.342 |
| 2021 |
269.2 |
0.343 |
| 2022 |
270.3 |
0.345 |
| 2023 |
271.3 |
0.346 |
| 2024 |
272.4 |
0.347 |
| 2025 |
273.5 |
0.347 |
| 2026 |
274.6 |
0.348 |
| 2027 |
275.6 |
0.349 |
| 2028 |
276.7 |
0.350 |
| 2029 |
277.7 |
0.351 |
| 2030 |
278.8 |
0.352 |
|
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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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