18374+7741 STT 363 (HD 173831)
18h 37m 23.92s +77° 41' 12.4" P.A. 335.00 sep 0.6 mag 7.52,8.10 Sp F0IV dist. 110.25 pc (359.64 l.y.)
| Coord 2000 |
18374+7741 |
|
Discov num |
STT 363 |
|
Comp |
|
|
Coord arcsec 2000 |
18 37 23.92 +77 41 12.4 |
|
| Date first |
1843 |
|
Date last |
2018 |
|
Obs |
71 |
|
| Pa first |
18 |
|
Pa last |
335.1 |
|
P.A. Now (θ) |
335.1° |
|
| Sep first |
0.6 |
|
Sep last |
0.555 |
|
Sep. Now (ρ) |
0.555" |
|
| Mag pri |
7.52 |
|
Mag sec |
8.10 |
|
delta mag (ΔM) |
0.58 |
|
Spectral class |
F0IV (yellow-white) |
|
| Pri motion ra |
+013 |
|
Sec motion ra |
|
|
| Pri motion dec |
+023 |
|
Sec motion dec |
|
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 173831 |
|
Constellation |
Draco |
|
SAO |
9199 |
|
HIP |
91298 |
|
| Tycho2 |
4574-01312-1 |
|
HD |
173831 |
|
GC |
25585 |
|
ADS |
11584 |
|
| BD |
BD+77 702 |
|
Distance |
110.25 |
|
Distance ly |
359.64 |
|
ORBITAL ELEMENTS
| Period (P) | 641.9y | ± 506 |
Periastron (T) | 1987.038y | ± 0.72 |
Semi-major axis (a) | 0.95a | ± 0.244 |
| Eccentricity (e) | 0.89 | ± 0.057 |
Inclination (i) | 78.3° | ± 1.7 |
Longitude of periastron (ω) | 55.9° | ± 4.8 |
| Node (Ω) | 159.7° | ± 1.5 |
Notes | | |
Reference | Sca2009a | |
| Equinox | 2000 | |
Last observation | 2006 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
337.5 |
0.298 |
| 2001 |
337.9 |
0.317 |
| 2002 |
338.4 |
0.334 |
| 2003 |
338.8 |
0.351 |
| 2004 |
339.1 |
0.368 |
| 2005 |
339.5 |
0.383 |
| 2006 |
339.8 |
0.398 |
| 2007 |
340.1 |
0.413 |
| 2008 |
340.3 |
0.427 |
| 2009 |
340.6 |
0.441 |
| 2010 |
340.8 |
0.454 |
| 2011 |
341.0 |
0.467 |
| 2012 |
341.2 |
0.480 |
| 2013 |
341.4 |
0.492 |
| 2014 |
341.6 |
0.504 |
| 2015 |
341.8 |
0.516 |
| 2016 |
342.0 |
0.527 |
| 2017 |
342.2 |
0.538 |
| 2018 |
342.3 |
0.549 |
| 2019 |
342.5 |
0.559 |
| 2020 |
342.6 |
0.569 |
| 2021 |
342.8 |
0.579 |
| 2022 |
342.9 |
0.589 |
| 2023 |
343.0 |
0.599 |
| 2024 |
343.1 |
0.608 |
| 2025 |
343.3 |
0.618 |
| 2026 |
343.4 |
0.627 |
| 2027 |
343.5 |
0.635 |
| 2028 |
343.6 |
0.644 |
| 2029 |
343.7 |
0.653 |
| 2030 |
343.8 |
0.661 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
