20536-7750 HDS 2977 AB (HD 197767)
20h 53m 34.76s -77° 50' 18.6" P.A. 296.00 sep 0.1 mag 10.19,10.31 Sp G8V dist. 97.28 pc (317.33 l.y.)
| Coord 2000 |
20536-7750 |
|
Discov num |
HDS2977 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 53 34.76 -77 50 18.6 |
|
| Date first |
1991 |
|
Date last |
2021 |
|
Obs |
9 |
|
| Pa first |
266 |
|
Pa last |
296.1 |
|
P.A. Now (θ) |
292.5° |
|
| Sep first |
0.3 |
|
Sep last |
0.123 |
|
Sep. Now (ρ) |
0.157" |
|
| Mag pri |
10.19 |
|
Mag sec |
10.31 |
|
delta mag (ΔM) |
0.12 |
|
Spectral class |
G8V (yellow) |
|
| Pri motion ra |
+050 |
|
Sec motion ra |
|
|
| Pri motion dec |
-057 |
|
Sec motion dec |
|
|
| Notes |
O
W
(Orbital solution, ) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 197767 |
|
Constellation |
Octans |
|
SAO |
257860 |
|
HIP |
103118 |
|
| Tycho2 |
9465-01119-1 |
|
HD |
197767 |
|
CP |
CP-78 1348 |
|
Distance |
97.28 |
|
| Distance ly |
317.33 |
|
ORBITAL ELEMENTS
| Period (P) | 67.8y | ± 14.7 |
Periastron (T) | 2018.44y | ± 0.09 |
Semi-major axis (a) | 0.227a | ± 0.024 |
| Eccentricity (e) | 0.825 | ± 0.024 |
Inclination (i) | 111.7° | ± 2.8 |
Longitude of periastron (ω) | 225.6° | ± 2.4 |
| Node (Ω) | 291.1° | ± 1.5 |
Notes | | |
Reference | Tok2021f | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
257.3 |
0.206 |
| 2001 |
255.9 |
0.196 |
| 2002 |
254.4 |
0.186 |
| 2003 |
252.6 |
0.176 |
| 2004 |
250.6 |
0.165 |
| 2005 |
248.4 |
0.154 |
| 2006 |
245.8 |
0.143 |
| 2007 |
242.7 |
0.131 |
| 2008 |
239.1 |
0.119 |
| 2009 |
234.6 |
0.108 |
| 2010 |
229.1 |
0.096 |
| 2011 |
222.1 |
0.085 |
| 2012 |
213.0 |
0.074 |
| 2013 |
201.2 |
0.065 |
| 2014 |
186.1 |
0.059 |
| 2015 |
168.4 |
0.055 |
| 2016 |
149.5 |
0.055 |
| 2017 |
130.8 |
0.055 |
| 2018 |
109.0 |
0.044 |
| 2019 |
9.2 |
0.018 |
| 2020 |
309.1 |
0.060 |
| 2021 |
299.6 |
0.099 |
| 2022 |
295.2 |
0.130 |
| 2023 |
292.5 |
0.157 |
| 2024 |
290.4 |
0.179 |
| 2025 |
288.8 |
0.199 |
| 2026 |
287.5 |
0.216 |
| 2027 |
286.3 |
0.231 |
| 2028 |
285.3 |
0.244 |
| 2029 |
284.4 |
0.256 |
| 2030 |
283.6 |
0.267 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
