20312+1116 DA 1 BC
20h 31m 11.94s +11° 15' 33.7" P.A. 184.00 sep 0.3 mag 7.90,8.00 Sp Am dist. 59.99 pc (195.69 l.y.)
| Coord 2000 |
20312+1116 |
|
Discov num |
DA 1 |
|
Comp |
BC |
|
Coord arcsec 2000 |
20 31 11.94 +11 15 33.7 |
|
| Date first |
1840 |
|
Date last |
2016 |
|
Obs |
98 |
|
| Pa first |
209 |
|
Pa last |
183.7 |
|
P.A. Now (θ) |
190.8° |
|
| Sep first |
0.7 |
|
Sep last |
0.297 |
|
Sep. Now (ρ) |
0.393" |
|
| Mag pri |
7.90 |
|
Mag sec |
8.00 |
|
delta mag (ΔM) |
0.1 |
|
Spectral class |
Am (white) |
|
| Pri motion ra |
-006 |
|
Sec motion ra |
-006 |
|
| Pri motion dec |
-010 |
|
Sec motion dec |
-010 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
20312+1116 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
106195 |
20 31 12 +11 15 34 |
CHR 99 Aa,Ab |
2016 |
15 |
142 |
0.4 |
7.10 |
|
|
|
|
| Show |
HD 195482 |
106195 |
20 31 12 +11 15 34 |
STF 2690 A,BC |
2020 |
161 |
255 |
17.8 |
7.12 |
7.39 |
0.27 |
|
|
| Show |
|
106195 |
20 31 12 +11 15 34 |
HJ 269 AD |
2016 |
17 |
108 |
23.0 |
7.12 |
12.10 |
4.98 |
|
|
| Show |
|
|
20 31 12 +11 15 34 |
DA 1 BC |
2016 |
98 |
184 |
0.3 |
7.90 |
8.00 |
0.10 |
Y |
<=== |
Quintuple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Delphinus |
|
HIP |
101233 |
|
Tycho2 |
1095-01695-1 |
|
Gaia DR2 |
1755310188501616128 |
|
| HD |
195482 |
|
ADS |
13946 |
|
Distance |
59.99 |
|
Distance ly |
195.69 |
|
ORBITAL ELEMENTS
| Period (P) | 236.52y | |
Periastron (T) | 1998.22y | |
Semi-major axis (a) | 0.448a | |
| Eccentricity (e) | 0.875 | |
Inclination (i) | 68.6° | |
Longitude of periastron (ω) | 237° | |
| Node (Ω) | 180.3° | |
Notes | n | |
Reference | Hrt2014b | |
| Equinox | 2000 | |
Last observation | 2006 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
151.3 |
0.049 |
| 2001 |
164.8 |
0.081 |
| 2002 |
170.7 |
0.111 |
| 2003 |
174.3 |
0.136 |
| 2004 |
176.8 |
0.159 |
| 2005 |
178.7 |
0.180 |
| 2006 |
180.2 |
0.199 |
| 2007 |
181.4 |
0.216 |
| 2008 |
182.5 |
0.233 |
| 2009 |
183.4 |
0.248 |
| 2010 |
184.3 |
0.262 |
| 2011 |
185.0 |
0.275 |
| 2012 |
185.7 |
0.288 |
| 2013 |
186.3 |
0.300 |
| 2014 |
186.9 |
0.311 |
| 2015 |
187.4 |
0.322 |
| 2016 |
187.9 |
0.332 |
| 2017 |
188.4 |
0.342 |
| 2018 |
188.9 |
0.351 |
| 2019 |
189.3 |
0.360 |
| 2020 |
189.7 |
0.369 |
| 2021 |
190.1 |
0.377 |
| 2022 |
190.5 |
0.385 |
| 2023 |
190.8 |
0.393 |
| 2024 |
191.2 |
0.400 |
| 2025 |
191.5 |
0.407 |
| 2026 |
191.8 |
0.414 |
| 2027 |
192.1 |
0.420 |
| 2028 |
192.4 |
0.426 |
| 2029 |
192.7 |
0.433 |
| 2030 |
193.0 |
0.438 |
|
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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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