17115-1630 HU 169 (HD 155317)
17h 11m 29.58s -16° 29' 30.8" P.A. 181.00 sep 0.3 mag 8.61,8.12 Sp A4V dist. 120.63 pc (393.5 l.y.)
Coord 2000 |
17115-1630 |
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Discov num |
HU 169 |
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Comp |
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Coord arcsec 2000 |
17 11 29.58 -16 29 30.8 |
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Date first |
1900 |
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Date last |
2018 |
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Obs |
27 |
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Pa first |
223 |
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Pa last |
181.2 |
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P.A. Now (θ) |
172.6° |
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Sep first |
0.1 |
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Sep last |
0.265 |
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Sep. Now (ρ) |
0.254" |
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Mag pri |
8.61 |
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Mag sec |
8.12 |
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delta mag (ΔM) |
0.49 |
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Spectral class |
A4V (white) |
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Pri motion ra |
-011 |
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Sec motion ra |
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Pri motion dec |
-003 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 155317 |
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Constellation |
Ophiuchus |
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SAO |
160347 |
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HIP |
84092 |
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Tycho2 |
6232-00807-1 |
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Gaia DR2 |
4135708882188315776 |
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HD |
155317 |
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ADS |
10385 |
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BD |
BD-16 4436 |
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Distance |
120.63 |
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Distance ly |
393.5 |
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ORBITAL ELEMENTS
Period (P) | 79.08y | ± 0.08 |
Periastron (T) | 1992y | ± 0.2 |
Semi-major axis (a) | 0.223a | ± 0.005 |
Eccentricity (e) | 0.452 | ± 0.006 |
Inclination (i) | 124.4° | ± 1 |
Longitude of periastron (ω) | 61.8° | ± 1 |
Node (Ω) | 22° | ± 1 |
Notes | n | |
Reference | Doc2018l | |
Equinox | 2000 | |
Last observation | 2018 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
222.5 |
0.152 |
2001 |
218.0 |
0.166 |
2002 |
214.2 |
0.180 |
2003 |
210.9 |
0.192 |
2004 |
208.0 |
0.203 |
2005 |
205.3 |
0.213 |
2006 |
202.9 |
0.222 |
2007 |
200.7 |
0.230 |
2008 |
198.6 |
0.237 |
2009 |
196.6 |
0.243 |
2010 |
194.7 |
0.248 |
2011 |
192.9 |
0.252 |
2012 |
191.1 |
0.255 |
2013 |
189.4 |
0.258 |
2014 |
187.7 |
0.260 |
2015 |
186.0 |
0.262 |
2016 |
184.4 |
0.262 |
2017 |
182.7 |
0.263 |
2018 |
181.1 |
0.262 |
2019 |
179.4 |
0.261 |
2020 |
177.7 |
0.260 |
2021 |
176.0 |
0.259 |
2022 |
174.3 |
0.257 |
2023 |
172.6 |
0.254 |
2024 |
170.8 |
0.251 |
2025 |
168.9 |
0.248 |
2026 |
167.1 |
0.245 |
2027 |
165.1 |
0.241 |
2028 |
163.1 |
0.237 |
2029 |
161.1 |
0.233 |
2030 |
159.0 |
0.229 |
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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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