22553-4828 I 22 AB
22h 55m 16.15s -48° 27' 56.6" P.A. 178.00 sep 0.6 mag 7.29,8.91 Sp G3/6 dist. 47.69 pc (155.56 l.y.)
| Coord 2000 |
22553-4828 |
|
Discov num |
I 22 |
|
Comp |
AB |
|
Coord arcsec 2000 |
22 55 16.15 -48 27 56.6 |
|
| Date first |
1894 |
|
Date last |
2017 |
|
Obs |
45 |
|
| Pa first |
200 |
|
Pa last |
177.5 |
|
P.A. Now (θ) |
177.5° |
|
| Sep first |
0.6 |
|
Sep last |
0.56 |
|
Sep. Now (ρ) |
0.56" |
|
| Mag pri |
7.29 |
|
Mag sec |
8.91 |
|
delta mag (ΔM) |
1.62 |
|
Spectral class |
G3/6 (yellow) |
|
| Pri motion ra |
-224 |
|
Sec motion ra |
-224 |
|
| Pri motion dec |
+058 |
|
Sec motion dec |
+058 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
22553-4828 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
231354 |
22 55 16 -48 27 57 |
I 22 AB |
2017 |
45 |
178 |
0.6 |
7.29 |
8.91 |
1.62 |
Y |
<=== |
| Show |
Tau2 Gru |
231354 |
22 55 16 -48 27 57 |
I 22 AB,CD |
2017 |
25 |
181 |
93.9 |
7.14 |
6.71 |
0.43 |
|
|
| Show |
|
231353 |
22 55 16 -48 29 30 |
B 2506 CD |
1964 |
5 |
267 |
0.1 |
7.30 |
7.50 |
0.20 |
|
|
Quadruple system
6 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Grus |
|
SAO |
231354 |
|
HIP |
113191 |
|
Tycho2 |
8450-01347-1 |
|
| Gaia DR2 |
6515008644030385792 |
|
HD |
216555 |
|
GC |
31953 |
|
CD |
CD-4913996 |
|
| CP |
CP-4911675 |
|
Bayer |
Tau 2 Gruis |
|
Bayer name |
Tau2 Gru |
|
Distance |
47.69 |
|
| Distance ly |
155.56 |
|
Bayer greek |
τ2 Gru |
|
ORBITAL ELEMENTS
| Period (P) | 198.04y | |
Periastron (T) | 2001.69y | |
Semi-major axis (a) | 0.965a | |
| Eccentricity (e) | 0.763 | |
Inclination (i) | 87.3° | |
Longitude of periastron (ω) | 256.7° | |
| Node (Ω) | 175° | |
Notes | n | |
Reference | Zir2012c | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
357.5 |
0.180 |
| 2001 |
0.1 |
0.108 |
| 2002 |
16.5 |
0.029 |
| 2003 |
163.7 |
0.056 |
| 2004 |
170.5 |
0.134 |
| 2005 |
172.3 |
0.206 |
| 2006 |
173.3 |
0.271 |
| 2007 |
173.8 |
0.328 |
| 2008 |
174.3 |
0.378 |
| 2009 |
174.6 |
0.423 |
| 2010 |
174.8 |
0.464 |
| 2011 |
175.1 |
0.500 |
| 2012 |
175.3 |
0.532 |
| 2013 |
175.4 |
0.561 |
| 2014 |
175.6 |
0.587 |
| 2015 |
175.7 |
0.611 |
| 2016 |
175.9 |
0.633 |
| 2017 |
176.0 |
0.653 |
| 2018 |
176.1 |
0.671 |
| 2019 |
176.2 |
0.688 |
| 2020 |
176.3 |
0.703 |
| 2021 |
176.4 |
0.716 |
| 2022 |
176.5 |
0.729 |
| 2023 |
176.6 |
0.740 |
| 2024 |
176.7 |
0.750 |
| 2025 |
176.8 |
0.760 |
| 2026 |
176.9 |
0.768 |
| 2027 |
177.0 |
0.776 |
| 2028 |
177.1 |
0.783 |
| 2029 |
177.1 |
0.789 |
| 2030 |
177.2 |
0.794 |
|
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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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