21209+0307 BU 838 (HD 203235)
21h 20m 55.78s +03° 07' 05.6" P.A. 156.00 sep 1.6 mag 7.92,10.02 Sp F8 dist. 70.97 pc (231.5 l.y.)
| Coord 2000 |
21209+0307 |
|
Discov num |
BU 838 |
|
Comp |
|
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Coord arcsec 2000 |
21 20 55.78 +03 07 05.6 |
|
| Date first |
1881 |
|
Date last |
2016 |
|
Obs |
63 |
|
| Pa first |
90 |
|
Pa last |
156 |
|
P.A. Now (θ) |
156° |
|
| Sep first |
1.3 |
|
Sep last |
1.644 |
|
Sep. Now (ρ) |
1.644" |
|
| Mag pri |
7.92 |
|
Mag sec |
10.02 |
|
delta mag (ΔM) |
2.1 |
|
Spectral class |
F8 (yellow-white) |
|
| Pri motion ra |
+133 |
|
Sec motion ra |
+133 |
|
| Pri motion dec |
+004 |
|
Sec motion dec |
+004 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 203235 |
|
Constellation |
Equuleus |
|
HIP |
105399 |
|
Tycho2 |
0532-00314-1 |
|
| Gaia DR2 |
2692691366400681216 |
|
HD |
203235 |
|
ADS |
14880 |
|
BD |
BD+02 4343 |
|
| Distance |
70.97 |
|
Distance ly |
231.5 |
|
ORBITAL ELEMENTS
| Period (P) | 1023.3887y | ± 492.068 |
Periastron (T) | 2050.7451y | ± 43.9035 |
Semi-major axis (a) | 5.36256a | ± 3.03216 |
| Eccentricity (e) | 0.85848 | ± 0.19487 |
Inclination (i) | 77.217° | ± 11.019 |
Longitude of periastron (ω) | 68.921° | ± 25.091 |
| Node (Ω) | 169.101° | ± 10.014 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2007 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
147.6 |
1.640 |
| 2001 |
148.0 |
1.639 |
| 2002 |
148.5 |
1.639 |
| 2003 |
148.9 |
1.639 |
| 2004 |
149.3 |
1.638 |
| 2005 |
149.7 |
1.637 |
| 2006 |
150.2 |
1.635 |
| 2007 |
150.6 |
1.634 |
| 2008 |
151.0 |
1.632 |
| 2009 |
151.5 |
1.629 |
| 2010 |
151.9 |
1.627 |
| 2011 |
152.3 |
1.623 |
| 2012 |
152.8 |
1.620 |
| 2013 |
153.2 |
1.616 |
| 2014 |
153.6 |
1.611 |
| 2015 |
154.1 |
1.606 |
| 2016 |
154.5 |
1.601 |
| 2017 |
155.0 |
1.594 |
| 2018 |
155.4 |
1.588 |
| 2019 |
155.9 |
1.580 |
| 2020 |
156.4 |
1.572 |
| 2021 |
156.8 |
1.563 |
| 2022 |
157.3 |
1.553 |
| 2023 |
157.8 |
1.543 |
| 2024 |
158.3 |
1.531 |
| 2025 |
158.8 |
1.518 |
| 2026 |
159.3 |
1.505 |
| 2027 |
159.8 |
1.490 |
| 2028 |
160.3 |
1.474 |
| 2029 |
160.8 |
1.456 |
| 2030 |
161.4 |
1.437 |
|
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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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