21538-2000 HU 380 BC
21h 53m 46.85s -20° 00' 23.7" P.A. 247.00 sep 0.4 mag 10.34,10.56 Sp F5V dist. 74.29 pc (242.33 l.y.)
| Coord 2000 |
21538-2000 |
|
Discov num |
HU 380 |
|
Comp |
BC |
|
Coord arcsec 2000 |
21 53 46.85 -20 00 23.7 |
|
| Date first |
1901 |
|
Date last |
2007 |
|
Obs |
26 |
|
| Pa first |
236 |
|
Pa last |
247.4 |
|
P.A. Now (θ) |
226.3° |
|
| Sep first |
0.4 |
|
Sep last |
0.397 |
|
Sep. Now (ρ) |
0.325" |
|
| Mag pri |
10.34 |
|
Mag sec |
10.56 |
|
delta mag (ΔM) |
0.22 |
|
Spectral class |
F5V (yellow-white) |
|
| Pri motion ra |
+041 |
|
Sec motion ra |
+041 |
|
| Pri motion dec |
+139 |
|
Sec motion dec |
+139 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21538-2000 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 208011 |
190716 |
21 53 46 -20 00 26 |
BU 168 A,BC |
2020 |
33 |
73 |
5.5 |
8.14 |
10.34 |
2.20 |
|
|
| Show |
|
190716 |
21 53 46 -20 00 26 |
BU 168 AD |
1999 |
4 |
136 |
39.8 |
8.12 |
14.00 |
5.88 |
|
|
| Show |
|
|
21 53 47 -20 00 24 |
HU 380 BC |
2007 |
26 |
247 |
0.4 |
10.34 |
10.56 |
0.22 |
Y |
<=== |
Quadruple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Capricornus |
|
HIP |
108072 |
|
Tycho2 |
6382-00016-2 |
|
Gaia DR2 |
6824222344899920640 |
|
| HD |
208011 |
|
ADS |
15419 |
|
BD |
BD-20 6313 |
|
Distance |
74.29 |
|
| Distance ly |
242.33 |
|
ORBITAL ELEMENTS
| Period (P) | 116.61y | |
Periastron (T) | 1949.62y | |
Semi-major axis (a) | 0.315a | |
| Eccentricity (e) | 0.279 | |
Inclination (i) | 128° | |
Longitude of periastron (ω) | 14.8° | |
| Node (Ω) | 76.1° | |
Notes | n | |
Reference | Hrt2014b | |
| Equinox | 2000 | |
Last observation | 2007 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
255.9 |
0.398 |
| 2001 |
254.8 |
0.399 |
| 2002 |
253.6 |
0.400 |
| 2003 |
252.5 |
0.400 |
| 2004 |
251.4 |
0.399 |
| 2005 |
250.2 |
0.399 |
| 2006 |
249.1 |
0.398 |
| 2007 |
247.9 |
0.396 |
| 2008 |
246.8 |
0.394 |
| 2009 |
245.6 |
0.392 |
| 2010 |
244.4 |
0.390 |
| 2011 |
243.2 |
0.387 |
| 2012 |
242.0 |
0.383 |
| 2013 |
240.8 |
0.380 |
| 2014 |
239.5 |
0.376 |
| 2015 |
238.2 |
0.371 |
| 2016 |
236.9 |
0.367 |
| 2017 |
235.5 |
0.361 |
| 2018 |
234.1 |
0.356 |
| 2019 |
232.6 |
0.350 |
| 2020 |
231.1 |
0.344 |
| 2021 |
229.6 |
0.338 |
| 2022 |
228.0 |
0.332 |
| 2023 |
226.3 |
0.325 |
| 2024 |
224.5 |
0.318 |
| 2025 |
222.7 |
0.311 |
| 2026 |
220.8 |
0.304 |
| 2027 |
218.8 |
0.296 |
| 2028 |
216.6 |
0.288 |
| 2029 |
214.4 |
0.281 |
| 2030 |
212.0 |
0.273 |
|
|
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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