12455-4552 HDS 1789 Aa,Ab (Iot Cru)
12h 45m 27.62s -45° 51' 45.2" P.A. 10.00 sep 0.1 mag 10.07,10.47 Sp G8V dist. 78.43 pc (255.84 l.y.)
| Coord 2000 |
12455-4552 |
|
Discov num |
HDS1789 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
12 45 27.62 -45 51 45.2 |
|
| Date first |
1991 |
|
Date last |
2023 |
|
Obs |
7 |
|
| Pa first |
52 |
|
Pa last |
9.8 |
|
P.A. Now (θ) |
76.5° (calc) |
|
| Sep first |
0.2 |
|
Sep last |
0.095 |
|
Sep. Now (ρ) |
0.094" (calc) |
|
| Mag pri |
10.07 |
|
Mag sec |
10.47 |
|
delta mag (ΔM) |
0.4 |
|
Spectral class |
G8V (yellow) |
|
| Pri motion ra |
-051 |
|
Sec motion ra |
|
|
| Pri motion dec |
-061 |
|
Sec motion dec |
|
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
12455-4552 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Iot Cru |
252016 |
12 45 28 -45 51 45 |
HDS 1789 Aa,Ab |
2023 |
7 |
10 |
0.1 |
10.07 |
10.47 |
0.40 |
Y |
<=== |
| Show |
|
223647 |
12 45 28 -45 51 45 |
DON 554 AB |
1948 |
3 |
313 |
1.3 |
10.07 |
13.60 |
3.53 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Iot Cru |
|
Constellation |
Centaurus |
|
SAO |
252016 |
|
HIP |
62252 |
|
| Tycho2 |
8245-00584-1 |
|
Gaia DR2 |
6129293062999434240 |
|
HD |
110861 |
|
HR |
4842 |
|
| GC |
17339 |
|
CD |
CD-45 7991 |
|
CP |
CP-45 6023 |
|
Bayer |
Iota Crucis |
|
| Bayer name |
Iot Cru |
|
Distance |
78.43 |
|
Distance ly |
255.84 |
|
Bayer greek |
ι Cru |
|
Bayer or Flamsteed indentifiers not always match the correct constellation because of procession and proper motion of the star. (Cru vs Cen)
ORBITAL ELEMENTS
| Period (P) | 23.41y | ± 0.45 |
Periastron (T) | 2024y | ± 0.38 |
Semi-major axis (a) | 0.127a | ± 0.005 |
| Eccentricity (e) | 0.248 | ± 0.059 |
Inclination (i) | 33.2° | ± 5.4 |
Longitude of periastron (ω) | 357.7° | ± 21.4 |
| Node (Ω) | 33.8° | ± 13.5 |
Notes | | |
Reference | Tok2024c | |
| Equinox | | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
18.8 |
0.095 |
| 2001 |
40.9 |
0.096 |
| 2002 |
63.1 |
0.095 |
| 2003 |
85.8 |
0.094 |
| 2004 |
108.2 |
0.096 |
| 2005 |
128.6 |
0.103 |
| 2006 |
146.2 |
0.112 |
| 2007 |
160.8 |
0.123 |
| 2008 |
173.0 |
0.134 |
| 2009 |
183.5 |
0.143 |
| 2010 |
192.8 |
0.151 |
| 2011 |
201.4 |
0.156 |
| 2012 |
209.5 |
0.158 |
| 2013 |
217.5 |
0.158 |
| 2014 |
225.7 |
0.155 |
| 2015 |
234.4 |
0.149 |
| 2016 |
243.9 |
0.141 |
| 2017 |
254.7 |
0.131 |
| 2018 |
267.5 |
0.120 |
| 2019 |
282.9 |
0.109 |
| 2020 |
301.5 |
0.100 |
| 2021 |
323.2 |
0.094 |
| 2022 |
346.4 |
0.093 |
| 2023 |
9.6 |
0.094 |
| 2024 |
31.9 |
0.095 |
| 2025 |
54.0 |
0.095 |
| 2026 |
76.5 |
0.094 |
| 2027 |
99.2 |
0.095 |
| 2028 |
120.6 |
0.100 |
| 2029 |
139.4 |
0.108 |
| 2030 |
155.1 |
0.118 |
| 2031 |
168.3 |
0.129 |
| 2032 |
179.4 |
0.139 |
| 2033 |
189.1 |
0.148 |
| 2034 |
197.9 |
0.154 |
| 2035 |
206.2 |
0.158 |
| 2036 |
214.2 |
0.158 |
| 2037 |
222.3 |
0.157 |
| 2038 |
230.7 |
0.152 |
| 2039 |
239.9 |
0.145 |
| 2040 |
250.1 |
0.135 |
| 2041 |
262.0 |
0.125 |
| 2042 |
276.2 |
0.113 |
| 2043 |
293.5 |
0.103 |
| 2044 |
314.0 |
0.096 |
| 2045 |
336.8 |
0.093 |
| 2046 |
0.2 |
0.093 |
| 2047 |
22.8 |
0.095 |
| 2048 |
44.9 |
0.095 |
| 2049 |
67.2 |
0.094 |
| 2050 |
89.9 |
0.094 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
