18352+1812 CHR 74 (HD 171623)
18h 35m 12.59s +18° 12' 12.2" P.A. 25.00 sep 0.1 mag 5.78, Sp A0Vn dist. 198.41 pc (647.21 l.y.)
Coord 2000 |
18352+1812 |
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Discov num |
CHR 74 |
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Comp |
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Coord arcsec 2000 |
18 35 12.59 +18 12 12.2 |
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Date first |
1985 |
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Date last |
2021 |
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Obs |
19 |
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Pa first |
212 |
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Pa last |
24.6 |
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P.A. Now (θ) |
24.6° |
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Sep first |
0.2 |
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Sep last |
0.149 |
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Sep. Now (ρ) |
0.149" |
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Mag pri |
5.78 |
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Mag sec |
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delta mag (ΔM) |
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Spectral class |
A0Vn (white) |
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Pri motion ra |
+016 |
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Sec motion ra |
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Pri motion dec |
+008 |
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Sec motion dec |
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Notes |
N
(See Notes) |
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Nature of this double is uncertain.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 171623 |
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Constellation |
Hercules |
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SAO |
103879 |
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HIP |
91118 |
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Tycho2 |
1574-02056-1 |
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Gaia DR2 |
4524091573480285696 |
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HD |
171623 |
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HR |
6977 |
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GC |
25398 |
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BD |
BD+18 3740 |
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Distance |
198.41 |
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Distance ly |
647.21 |
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ORBITAL ELEMENTS
Period (P) | 68.4y | ± 1.6 |
Periastron (T) | 2042.1y | ± 2.3 |
Semi-major axis (a) | 168.4m | ± 1.5 |
Eccentricity (e) | 0 | ± 0.02 |
Inclination (i) | 116.6° | ± 0.6 |
Longitude of periastron (ω) | 139° | ± 12 |
Node (Ω) | 40.2° | ± 0.9 |
Notes | | |
Reference | Hor2015b | |
Equinox | 2000 | |
Last observation | 2014 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
114.0 |
0.078 |
2001 |
103.5 |
0.082 |
2002 |
94.3 |
0.089 |
2003 |
86.4 |
0.096 |
2004 |
79.7 |
0.104 |
2005 |
74.0 |
0.113 |
2006 |
69.1 |
0.121 |
2007 |
64.9 |
0.129 |
2008 |
61.1 |
0.137 |
2009 |
57.7 |
0.144 |
2010 |
54.7 |
0.151 |
2011 |
51.8 |
0.156 |
2012 |
49.2 |
0.161 |
2013 |
46.6 |
0.164 |
2014 |
44.2 |
0.167 |
2015 |
41.8 |
0.168 |
2016 |
39.5 |
0.168 |
2017 |
37.1 |
0.167 |
2018 |
34.7 |
0.165 |
2019 |
32.2 |
0.162 |
2020 |
29.6 |
0.158 |
2021 |
26.8 |
0.153 |
2022 |
23.9 |
0.147 |
2023 |
20.6 |
0.140 |
2024 |
17.0 |
0.132 |
2025 |
12.9 |
0.124 |
2026 |
8.3 |
0.116 |
2027 |
2.9 |
0.107 |
2028 |
356.6 |
0.099 |
2029 |
349.2 |
0.091 |
2030 |
340.5 |
0.085 |
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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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