20239-4225 BU 763 AB (Kap2 Sgr)
20h 23m 53.17s -42° 25' 22.2" P.A. 180.00 sep 0.5 mag 5.67,7.25 Sp A5V dist. 95.51 pc (311.55 l.y.)
| Coord 2000 |
20239-4225 |
|
Discov num |
BU 763 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 23 53.17 -42 25 22.2 |
|
| Date first |
1874 |
|
Date last |
2021 |
|
Obs |
55 |
|
| Pa first |
225 |
|
Pa last |
179.7 |
|
P.A. Now (θ) |
182.8° |
|
| Sep first |
1.5 |
|
Sep last |
0.488 |
|
Sep. Now (ρ) |
0.529" |
|
| Mag pri |
5.67 |
|
Mag sec |
7.25 |
|
delta mag (ΔM) |
1.58 |
|
Spectral class |
A5V (white) |
|
| Pri motion ra |
-006 |
|
Sec motion ra |
-006 |
|
| Pri motion dec |
+024 |
|
Sec motion dec |
+024 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
20239-4225 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Kap2 Sgr |
230184 |
20 23 53 -42 25 22 |
BU 763 AB |
2021 |
55 |
180 |
0.5 |
5.67 |
7.25 |
1.58 |
Y |
<=== |
| Show |
|
230184 |
20 23 53 -42 25 22 |
I 1626 AC |
1998 |
2 |
268 |
18.6 |
5.67 |
14.30 |
8.63 |
|
|
| Show |
|
230184 |
20 23 53 -42 25 22 |
SEE 511 AD |
2000 |
4 |
219 |
29.8 |
5.67 |
14.00 |
8.33 |
|
|
Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Kap2 Sgr |
|
Constellation |
Sagittarius |
|
SAO |
230184 |
|
HIP |
100591 |
|
| Tycho2 |
7957-01410-1 |
|
Gaia DR2 |
6679362821813065856 |
|
HD |
193807 |
|
HR |
7787 |
|
| GC |
28341 |
|
CD |
CD-4214847 |
|
CP |
CP-42 9068 |
|
Bayer |
Kappa 2 Sagittarii |
|
| Bayer name |
Kap2 Sgr |
|
Distance |
95.51 |
|
Distance ly |
311.55 |
|
Bayer greek |
κ2 Sgr |
|
ORBITAL ELEMENTS
| Period (P) | 180.2y | ± 2.7 |
Periastron (T) | 2003.82y | ± 0.09 |
Semi-major axis (a) | 0.609a | ± 0.006 |
| Eccentricity (e) | 0.806 | ± 0.003 |
Inclination (i) | 32.1° | ± 1.2 |
Longitude of periastron (ω) | 181.8° | ± 1.9 |
| Node (Ω) | 216.3° | ± 1.7 |
Notes | n | |
Reference | Tok2021f | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
316.7 |
0.165 |
| 2001 |
332.3 |
0.145 |
| 2002 |
352.3 |
0.129 |
| 2003 |
16.3 |
0.121 |
| 2004 |
42.6 |
0.118 |
| 2005 |
68.7 |
0.122 |
| 2006 |
91.9 |
0.133 |
| 2007 |
110.5 |
0.151 |
| 2008 |
124.8 |
0.173 |
| 2009 |
135.6 |
0.199 |
| 2010 |
144.0 |
0.225 |
| 2011 |
150.5 |
0.251 |
| 2012 |
155.9 |
0.278 |
| 2013 |
160.3 |
0.304 |
| 2014 |
164.0 |
0.329 |
| 2015 |
167.1 |
0.354 |
| 2016 |
169.9 |
0.378 |
| 2017 |
172.4 |
0.402 |
| 2018 |
174.5 |
0.424 |
| 2019 |
176.5 |
0.447 |
| 2020 |
178.3 |
0.468 |
| 2021 |
179.9 |
0.489 |
| 2022 |
181.4 |
0.509 |
| 2023 |
182.8 |
0.529 |
| 2024 |
184.1 |
0.548 |
| 2025 |
185.2 |
0.567 |
| 2026 |
186.4 |
0.585 |
| 2027 |
187.4 |
0.603 |
| 2028 |
188.4 |
0.620 |
| 2029 |
189.4 |
0.637 |
| 2030 |
190.2 |
0.653 |
|
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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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