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 |
2022 |
|
Obs |
46 |
|
| Pa first |
200 |
|
Pa last |
177.5 |
|
P.A. Now (θ) |
177.5° |
|
| Sep first |
0.6 |
|
Sep last |
0.615 |
|
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 |
|
|
22 55 16 -48 27 57 |
I 22 AB |
2022 |
46 |
178 |
0.6 |
7.29 |
8.91 |
1.62 |
Y |
<=== |
| Show |
Tau2 Gru |
|
22 55 16 -48 27 57 |
I 22 AB,CD |
2017 |
25 |
181 |
93.9 |
7.14 |
6.71 |
0.43 |
|
|
| Show |
|
|
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 |
216655 |
|
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) | 151.9y | ± 2.7 |
Periastron (T) | 2001.6y | ± 0.17 |
Semi-major axis (a) | 0.805a | ± 0.017 |
| Eccentricity (e) | 0.734 | ± 0.016 |
Inclination (i) | 86.8° | ± 0.3 |
Longitude of periastron (ω) | 263.8° | ± 0.2 |
| Node (Ω) | 174.8° | ± 0.1 |
Notes | n | |
Reference | Tok2022g | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
358.5 |
0.151 |
| 2001 |
3.6 |
0.074 |
| 2002 |
126.7 |
0.016 |
| 2003 |
167.8 |
0.095 |
| 2004 |
171.3 |
0.170 |
| 2005 |
172.8 |
0.237 |
| 2006 |
173.6 |
0.295 |
| 2007 |
174.2 |
0.343 |
| 2008 |
174.6 |
0.385 |
| 2009 |
175.0 |
0.421 |
| 2010 |
175.3 |
0.452 |
| 2011 |
175.6 |
0.478 |
| 2012 |
175.8 |
0.501 |
| 2013 |
176.0 |
0.521 |
| 2014 |
176.2 |
0.538 |
| 2015 |
176.4 |
0.553 |
| 2016 |
176.6 |
0.565 |
| 2017 |
176.8 |
0.576 |
| 2018 |
177.0 |
0.585 |
| 2019 |
177.1 |
0.593 |
| 2020 |
177.3 |
0.599 |
| 2021 |
177.4 |
0.605 |
| 2022 |
177.6 |
0.609 |
| 2023 |
177.8 |
0.612 |
| 2024 |
177.9 |
0.614 |
| 2025 |
178.1 |
0.615 |
| 2026 |
178.2 |
0.615 |
| 2027 |
178.4 |
0.615 |
| 2028 |
178.5 |
0.614 |
| 2029 |
178.7 |
0.612 |
| 2030 |
178.8 |
0.610 |
| 2031 |
179.0 |
0.607 |
| 2032 |
179.2 |
0.604 |
| 2033 |
179.3 |
0.600 |
| 2034 |
179.5 |
0.595 |
| 2035 |
179.7 |
0.590 |
| 2036 |
179.8 |
0.585 |
| 2037 |
180.0 |
0.580 |
| 2038 |
180.2 |
0.574 |
| 2039 |
180.3 |
0.567 |
| 2040 |
180.5 |
0.560 |
| 2041 |
180.7 |
0.553 |
| 2042 |
180.9 |
0.546 |
| 2043 |
181.1 |
0.538 |
| 2044 |
181.3 |
0.530 |
| 2045 |
181.5 |
0.522 |
| 2046 |
181.7 |
0.514 |
| 2047 |
182.0 |
0.505 |
| 2048 |
182.2 |
0.496 |
| 2049 |
182.4 |
0.487 |
| 2050 |
182.7 |
0.477 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
