23270-1515 HU 297 (HD 220811)
23h 26m 57.04s -15° 14' 51.7" P.A. 304.00 sep 0.5 mag 7.24,8.52 Sp A4V dist. 116.69 pc (380.64 l.y.)
| Coord 2000 |
23270-1515 |
|
Discov num |
HU 297 |
|
Comp |
|
|
Coord arcsec 2000 |
23 26 57.04 -15 14 51.7 |
|
| Date first |
1900 |
|
Date last |
2018 |
|
Obs |
15 |
|
| Pa first |
312 |
|
Pa last |
303.5 |
|
P.A. Now (θ) |
303.5° |
|
| Sep first |
0.4 |
|
Sep last |
0.527 |
|
Sep. Now (ρ) |
0.527" |
|
| Mag pri |
7.24 |
|
Mag sec |
8.52 |
|
delta mag (ΔM) |
1.28 |
|
Spectral class |
A4V (white) |
|
| Pri motion ra |
+023 |
|
Sec motion ra |
|
|
| Pri motion dec |
-007 |
|
Sec motion dec |
|
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 220811 |
|
Constellation |
Aquarius |
|
SAO |
165698 |
|
HIP |
115742 |
|
| Tycho2 |
6396-00587-1 |
|
Gaia DR2 |
2407648994148333824 |
|
HD |
220811 |
|
GC |
32619 |
|
| ADS |
16758 |
|
BD |
BD-16 6291 |
|
Distance |
116.69 |
|
Distance ly |
380.64 |
|
ORBITAL ELEMENTS
| Period (P) | 92.6y | ± 2.9 |
Periastron (T) | 1983.5y | ± 1.8 |
Semi-major axis (a) | 0.374a | ± 0.067 |
| Eccentricity (e) | 0.9 | |
Inclination (i) | 111.5° | ± 7.8 |
Longitude of periastron (ω) | 48.6° | ± 11.3 |
| Node (Ω) | 142.5° | ± 3.2 |
Notes | | |
Reference | Tok2019c | |
| Equinox | | |
Last observation | 2018 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
310.1 |
0.439 |
| 2001 |
309.6 |
0.449 |
| 2002 |
309.2 |
0.458 |
| 2003 |
308.8 |
0.466 |
| 2004 |
308.4 |
0.474 |
| 2005 |
308.0 |
0.481 |
| 2006 |
307.7 |
0.488 |
| 2007 |
307.3 |
0.494 |
| 2008 |
307.0 |
0.499 |
| 2009 |
306.6 |
0.504 |
| 2010 |
306.3 |
0.508 |
| 2011 |
305.9 |
0.512 |
| 2012 |
305.6 |
0.515 |
| 2013 |
305.3 |
0.518 |
| 2014 |
305.0 |
0.521 |
| 2015 |
304.6 |
0.523 |
| 2016 |
304.3 |
0.524 |
| 2017 |
304.0 |
0.526 |
| 2018 |
303.7 |
0.526 |
| 2019 |
303.4 |
0.527 |
| 2020 |
303.1 |
0.527 |
| 2021 |
302.8 |
0.527 |
| 2022 |
302.4 |
0.526 |
| 2023 |
302.1 |
0.525 |
| 2024 |
301.8 |
0.524 |
| 2025 |
301.5 |
0.522 |
| 2026 |
301.2 |
0.520 |
| 2027 |
300.8 |
0.517 |
| 2028 |
300.5 |
0.515 |
| 2029 |
300.2 |
0.512 |
| 2030 |
299.9 |
0.508 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
