18439+0237 STF 2369 (HD 173174)
18h 43m 55.78s +02° 37' 16.6" P.A. 25.00 sep 0.3 mag 9.43,8.32 Sp G0 dist. 85.47 pc (278.8 l.y.)
| Coord 2000 |
18439+0237 |
|
Discov num |
STF2369 |
|
Comp |
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Coord arcsec 2000 |
18 43 55.78 +02 37 16.6 |
|
| Date first |
1830 |
|
Date last |
2016 |
|
Obs |
111 |
|
| Pa first |
98 |
|
Pa last |
24.8 |
|
P.A. Now (θ) |
24.8° |
|
| Sep first |
1.5 |
|
Sep last |
0.279 |
|
Sep. Now (ρ) |
0.279" |
|
| Mag pri |
9.43 |
|
Mag sec |
8.32 |
|
delta mag (ΔM) |
1.11 |
|
Spectral class |
G0 (yellow) |
|
| Pri motion ra |
-033 |
|
Sec motion ra |
-033 |
|
| Pri motion dec |
-060 |
|
Sec motion dec |
-060 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 173174 |
|
Constellation |
Serpens |
|
SAO |
123858 |
|
HIP |
91889 |
|
| Tycho2 |
0451-01023-1 |
|
Gaia DR2 |
4280130490399573248 |
|
HD |
173174 |
|
GC |
25622 |
|
| ADS |
11617 |
|
BD |
BD+02 3668 |
|
Distance |
85.47 |
|
Distance ly |
278.8 |
|
ORBITAL ELEMENTS
| Period (P) | 1458.9093y | ± 684.0089 |
Periastron (T) | 2066.3115y | ± 285.9756 |
Semi-major axis (a) | 3.70102a | ± 2.12697 |
| Eccentricity (e) | 0.95848 | ± 0.25228 |
Inclination (i) | 98.969° | ± 6.87 |
Longitude of periastron (ω) | 242.157° | ± 51.826 |
| Node (Ω) | 126.819° | ± 23.556 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2007 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
55.2 |
0.379 |
| 2001 |
54.1 |
0.373 |
| 2002 |
53.0 |
0.367 |
| 2003 |
51.9 |
0.361 |
| 2004 |
50.7 |
0.356 |
| 2005 |
49.5 |
0.350 |
| 2006 |
48.3 |
0.345 |
| 2007 |
47.0 |
0.340 |
| 2008 |
45.7 |
0.335 |
| 2009 |
44.3 |
0.330 |
| 2010 |
42.9 |
0.325 |
| 2011 |
41.5 |
0.321 |
| 2012 |
40.0 |
0.316 |
| 2013 |
38.5 |
0.312 |
| 2014 |
36.9 |
0.308 |
| 2015 |
35.3 |
0.304 |
| 2016 |
33.7 |
0.301 |
| 2017 |
32.0 |
0.297 |
| 2018 |
30.3 |
0.294 |
| 2019 |
28.5 |
0.291 |
| 2020 |
26.7 |
0.288 |
| 2021 |
24.9 |
0.286 |
| 2022 |
23.0 |
0.284 |
| 2023 |
21.1 |
0.282 |
| 2024 |
19.2 |
0.280 |
| 2025 |
17.3 |
0.278 |
| 2026 |
15.4 |
0.277 |
| 2027 |
13.4 |
0.276 |
| 2028 |
11.4 |
0.276 |
| 2029 |
9.5 |
0.275 |
| 2030 |
7.5 |
0.275 |
|
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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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