17305-1446 HU 177 (HD 158561)
17h 30m 32.15s -14° 46' 21.3" P.A. 172.00 sep 0.3 mag 8.50,9.60 Sp F0V dist. 197.63 pc (644.67 l.y.)
Coord 2000 |
17305-1446 |
|
Discov num |
HU 177 |
|
Comp |
|
|
Coord arcsec 2000 |
17 30 32.15 -14 46 21.3 |
|
Date first |
1900 |
|
Date last |
2018 |
|
Obs |
17 |
|
Pa first |
85 |
|
Pa last |
171.5 |
|
P.A. Now (θ) |
171.5° |
|
Sep first |
0.4 |
|
Sep last |
0.273 |
|
Sep. Now (ρ) |
0.273" |
|
Mag pri |
8.50 |
|
Mag sec |
9.60 |
|
delta mag (ΔM) |
1.1 |
|
Spectral class |
F0V (yellow-white) |
|
Pri motion ra |
-002 |
|
Sec motion ra |
|
|
Pri motion dec |
+003 |
|
Sec motion dec |
|
|
Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 158561 |
|
Constellation |
Serpens |
|
SAO |
160594 |
|
HIP |
85679 |
|
Tycho2 |
5671-00844-1 |
|
Gaia DR2 |
4137248232844261632 |
|
HD |
158561 |
|
ADS |
10595 |
|
BD |
BD-14 4665 |
|
Distance |
197.63 |
|
Distance ly |
644.67 |
|
ORBITAL ELEMENTS
Period (P) | 220.41y | |
Periastron (T) | 1987.21y | |
Semi-major axis (a) | 0.293a | |
Eccentricity (e) | 0.541 | |
Inclination (i) | 156.3° | |
Longitude of periastron (ω) | 252.6° | |
Node (Ω) | 179.5° | |
Notes | | |
Reference | Msn2017a | |
Equinox | 2000 | |
Last observation | 2015 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
215.1 |
0.169 |
2001 |
211.4 |
0.175 |
2002 |
208.0 |
0.180 |
2003 |
204.8 |
0.186 |
2004 |
201.8 |
0.192 |
2005 |
199.0 |
0.198 |
2006 |
196.3 |
0.204 |
2007 |
193.8 |
0.210 |
2008 |
191.4 |
0.215 |
2009 |
189.1 |
0.221 |
2010 |
186.9 |
0.227 |
2011 |
184.9 |
0.232 |
2012 |
182.9 |
0.237 |
2013 |
181.1 |
0.243 |
2014 |
179.3 |
0.248 |
2015 |
177.5 |
0.253 |
2016 |
175.9 |
0.258 |
2017 |
174.3 |
0.263 |
2018 |
172.8 |
0.268 |
2019 |
171.3 |
0.272 |
2020 |
169.9 |
0.277 |
2021 |
168.5 |
0.281 |
2022 |
167.1 |
0.286 |
2023 |
165.8 |
0.290 |
2024 |
164.6 |
0.294 |
2025 |
163.3 |
0.298 |
2026 |
162.1 |
0.302 |
2027 |
161.0 |
0.306 |
2028 |
159.8 |
0.310 |
2029 |
158.7 |
0.314 |
2030 |
157.6 |
0.317 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|