18463-2721 B 405 (HD 173427)
18h 46m 16.27s -27° 20' 46.9" P.A. 136.00 sep 0.5 mag 8.66,9.30 Sp G2V dist. 72.15 pc (235.35 l.y.)
| Coord 2000 |
18463-2721 |
|
Discov num |
B 405 |
|
Comp |
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|
Coord arcsec 2000 |
18 46 16.27 -27 20 46.9 |
|
| Date first |
1927 |
|
Date last |
2018 |
|
Obs |
20 |
|
| Pa first |
143 |
|
Pa last |
135.8 |
|
P.A. Now (θ) |
135.8° |
|
| Sep first |
0.5 |
|
Sep last |
0.503 |
|
Sep. Now (ρ) |
0.503" |
|
| Mag pri |
8.66 |
|
Mag sec |
9.30 |
|
delta mag (ΔM) |
0.64 |
|
Spectral class |
G2V (yellow) |
|
| Pri motion ra |
-019 |
|
Sec motion ra |
-019 |
|
| Pri motion dec |
-063 |
|
Sec motion dec |
-063 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 173427 |
|
Constellation |
Sagittarius |
|
SAO |
187251 |
|
HIP |
92104 |
|
| Tycho2 |
6867-00158-1 |
|
Gaia DR2 |
4072177004404608640 |
|
HD |
173427 |
|
GC |
25681 |
|
| ADS |
11643 |
|
CD |
CD-2713181 |
|
CP |
CP-27 6516 |
|
Distance |
72.15 |
|
| Distance ly |
235.35 |
|
ORBITAL ELEMENTS
| Period (P) | 87.95y | |
Periastron (T) | 1967.62y | |
Semi-major axis (a) | 0.343a | |
| Eccentricity (e) | 0.559 | |
Inclination (i) | 135.3° | |
Longitude of periastron (ω) | 14° | |
| Node (Ω) | 336.5° | |
Notes | | |
Reference | Msn1999c | |
| Equinox | 2000 | |
Last observation | 1991 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
158.5 |
0.507 |
| 2001 |
157.4 |
0.512 |
| 2002 |
156.3 |
0.516 |
| 2003 |
155.2 |
0.520 |
| 2004 |
154.2 |
0.523 |
| 2005 |
153.2 |
0.525 |
| 2006 |
152.1 |
0.527 |
| 2007 |
151.1 |
0.528 |
| 2008 |
150.1 |
0.529 |
| 2009 |
149.1 |
0.529 |
| 2010 |
148.1 |
0.529 |
| 2011 |
147.1 |
0.528 |
| 2012 |
146.0 |
0.526 |
| 2013 |
145.0 |
0.524 |
| 2014 |
144.0 |
0.522 |
| 2015 |
142.9 |
0.519 |
| 2016 |
141.9 |
0.515 |
| 2017 |
140.8 |
0.511 |
| 2018 |
139.7 |
0.506 |
| 2019 |
138.6 |
0.501 |
| 2020 |
137.4 |
0.495 |
| 2021 |
136.2 |
0.489 |
| 2022 |
135.0 |
0.482 |
| 2023 |
133.8 |
0.475 |
| 2024 |
132.5 |
0.467 |
| 2025 |
131.2 |
0.459 |
| 2026 |
129.8 |
0.450 |
| 2027 |
128.4 |
0.441 |
| 2028 |
126.9 |
0.431 |
| 2029 |
125.3 |
0.420 |
| 2030 |
123.7 |
0.410 |
| 2031 |
121.9 |
0.398 |
| 2032 |
120.1 |
0.386 |
| 2033 |
118.1 |
0.374 |
| 2034 |
116.0 |
0.362 |
| 2035 |
113.8 |
0.348 |
| 2036 |
111.4 |
0.335 |
| 2037 |
108.7 |
0.321 |
| 2038 |
105.8 |
0.307 |
| 2039 |
102.7 |
0.293 |
| 2040 |
99.2 |
0.278 |
| 2041 |
95.3 |
0.263 |
| 2042 |
91.0 |
0.249 |
| 2043 |
86.1 |
0.234 |
| 2044 |
80.6 |
0.221 |
| 2045 |
74.4 |
0.207 |
| 2046 |
67.4 |
0.195 |
| 2047 |
59.5 |
0.184 |
| 2048 |
50.7 |
0.175 |
| 2049 |
41.0 |
0.168 |
| 2050 |
30.7 |
0.163 |
|
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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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