21355+2427 HU 371 (HD 205541)
21h 35m 27.03s +24° 27' 07.9" P.A. 319.00 sep 0.3 mag 6.83,7.27 Sp A3V dist. 197.63 pc (644.67 l.y.)
| Coord 2000 |
21355+2427 |
|
Discov num |
HU 371 |
|
Comp |
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|
Coord arcsec 2000 |
21 35 27.03 +24 27 07.9 |
|
| Date first |
1901 |
|
Date last |
2009 |
|
Obs |
124 |
|
| Pa first |
163 |
|
Pa last |
318.8 |
|
P.A. Now (θ) |
333.3° |
|
| Sep first |
0.2 |
|
Sep last |
0.264 |
|
Sep. Now (ρ) |
0.217" |
|
| Mag pri |
6.83 |
|
Mag sec |
7.27 |
|
delta mag (ΔM) |
0.44 |
|
Spectral class |
A3V (white) |
|
| Pri motion ra |
+015 |
|
Sec motion ra |
|
|
| Pri motion dec |
-007 |
|
Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 205541 |
|
Constellation |
Pegasus |
|
SAO |
89819 |
|
HIP |
106605 |
|
| Tycho2 |
2192-01904-1 |
|
Gaia DR2 |
1797854485265424512 |
|
HD |
205541 |
|
HR |
8258 |
|
| GC |
30231 |
|
ADS |
15115 |
|
BD |
BD+23 4346 |
|
Distance |
197.63 |
|
| Distance ly |
644.67 |
|
ORBITAL ELEMENTS
| Period (P) | 178.6y | |
Periastron (T) | 1870.2y | |
Semi-major axis (a) | 0.272a | |
| Eccentricity (e) | 0.31 | |
Inclination (i) | 59.7° | |
Longitude of periastron (ω) | 296.6° | |
| Node (Ω) | 136.9° | |
Notes | n | |
Reference | WSI2006b | |
| Equinox | 2000 | |
Last observation | 2005 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
310.1 |
0.301 |
| 2001 |
310.9 |
0.300 |
| 2002 |
311.7 |
0.298 |
| 2003 |
312.5 |
0.297 |
| 2004 |
313.3 |
0.295 |
| 2005 |
314.1 |
0.293 |
| 2006 |
314.9 |
0.291 |
| 2007 |
315.8 |
0.289 |
| 2008 |
316.7 |
0.286 |
| 2009 |
317.5 |
0.283 |
| 2010 |
318.4 |
0.280 |
| 2011 |
319.4 |
0.277 |
| 2012 |
320.3 |
0.273 |
| 2013 |
321.3 |
0.270 |
| 2014 |
322.3 |
0.266 |
| 2015 |
323.3 |
0.261 |
| 2016 |
324.4 |
0.257 |
| 2017 |
325.5 |
0.252 |
| 2018 |
326.6 |
0.247 |
| 2019 |
327.8 |
0.241 |
| 2020 |
329.1 |
0.236 |
| 2021 |
330.4 |
0.230 |
| 2022 |
331.8 |
0.224 |
| 2023 |
333.3 |
0.217 |
| 2024 |
334.8 |
0.211 |
| 2025 |
336.5 |
0.204 |
| 2026 |
338.3 |
0.197 |
| 2027 |
340.2 |
0.189 |
| 2028 |
342.3 |
0.182 |
| 2029 |
344.5 |
0.175 |
| 2030 |
347.0 |
0.167 |
|
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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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