18434-5546 B 398 AB
18h 43m 25.45s -55° 46' 00.8" P.A. 340.00 sep 0.3 mag 8.07,9.17 Sp F5+G2 dist. 62.38 pc (203.48 l.y.)
| Coord 2000 |
18434-5546 |
|
Discov num |
B 398 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 43 25.45 -55 46 00.8 |
|
| Date first |
1926 |
|
Date last |
2021 |
|
Obs |
27 |
|
| Pa first |
341 |
|
Pa last |
340.3 |
|
P.A. Now (θ) |
335.9° |
|
| Sep first |
0.2 |
|
Sep last |
0.253 |
|
Sep. Now (ρ) |
0.222" |
|
| Mag pri |
8.07 |
|
Mag sec |
9.17 |
|
delta mag (ΔM) |
1.1 |
|
Spectral class |
F5+G2 (yellow-white/yellow) |
|
| Pri motion ra |
-005 |
|
Sec motion ra |
|
|
| Pri motion dec |
-076 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
18434-5546 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
245656 |
18 43 25 -55 46 01 |
B 398 AB |
2021 |
27 |
340 |
0.3 |
8.07 |
9.17 |
1.10 |
Y |
<=== |
| Show |
HD 172447 |
245656 |
18 43 25 -55 46 01 |
HJ 5053 AB,C |
1999 |
12 |
197 |
32.6 |
7.71 |
10.16 |
2.45 |
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Telescopium |
|
SAO |
245656 |
|
HIP |
91837 |
|
Tycho2 |
8762-02325-1 |
|
| Gaia DR2 |
6649812789684607488 |
|
HD |
172447 |
|
GC |
25573 |
|
CP |
CP-55 8807 |
|
| Distance |
62.38 |
|
Distance ly |
203.48 |
|
ORBITAL ELEMENTS
| Period (P) | 47.04y | ± 0.68 |
Periastron (T) | 2013.95y | ± 0.45 |
Semi-major axis (a) | 0.279a | ± 0.005 |
| Eccentricity (e) | 0.124 | ± 0.005 |
Inclination (i) | 105.2° | ± 0.3 |
Longitude of periastron (ω) | 133.2° | ± 5.9 |
| Node (Ω) | 166.8° | ± 0.4 |
Notes | n | |
Reference | Doc2016i | |
| Equinox | 2000 | |
Last observation | 2015 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
163.2 |
0.285 |
| 2001 |
161.2 |
0.271 |
| 2002 |
159.0 |
0.254 |
| 2003 |
156.3 |
0.232 |
| 2004 |
153.1 |
0.207 |
| 2005 |
149.0 |
0.179 |
| 2006 |
143.2 |
0.149 |
| 2007 |
134.4 |
0.118 |
| 2008 |
119.6 |
0.089 |
| 2009 |
93.7 |
0.069 |
| 2010 |
59.2 |
0.069 |
| 2011 |
32.7 |
0.088 |
| 2012 |
17.3 |
0.116 |
| 2013 |
8.2 |
0.146 |
| 2014 |
2.1 |
0.175 |
| 2015 |
357.7 |
0.201 |
| 2016 |
354.3 |
0.222 |
| 2017 |
351.4 |
0.238 |
| 2018 |
348.8 |
0.249 |
| 2019 |
346.3 |
0.254 |
| 2020 |
343.9 |
0.253 |
| 2021 |
341.4 |
0.248 |
| 2022 |
338.8 |
0.237 |
| 2023 |
335.9 |
0.222 |
| 2024 |
332.4 |
0.203 |
| 2025 |
328.3 |
0.182 |
| 2026 |
322.9 |
0.158 |
| 2027 |
315.6 |
0.134 |
| 2028 |
305.2 |
0.111 |
| 2029 |
289.8 |
0.091 |
| 2030 |
268.2 |
0.080 |
| 2031 |
243.8 |
0.082 |
| 2032 |
223.4 |
0.095 |
| 2033 |
209.1 |
0.116 |
| 2034 |
199.5 |
0.140 |
| 2035 |
192.8 |
0.165 |
| 2036 |
187.8 |
0.189 |
| 2037 |
183.9 |
0.213 |
| 2038 |
180.8 |
0.234 |
| 2039 |
178.2 |
0.253 |
| 2040 |
175.9 |
0.269 |
| 2041 |
173.9 |
0.283 |
| 2042 |
172.0 |
0.293 |
| 2043 |
170.3 |
0.299 |
| 2044 |
168.6 |
0.302 |
| 2045 |
166.8 |
0.300 |
| 2046 |
165.1 |
0.295 |
| 2047 |
163.3 |
0.286 |
| 2048 |
161.3 |
0.272 |
| 2049 |
159.0 |
0.255 |
| 2050 |
156.4 |
0.233 |
|
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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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