18386+1632 HO 87 AB (HD 172246)
18h 38m 36.74s +16° 32' 27.7" P.A. 96.00 sep 0.4 mag 8.34,8.98 Sp G5 dist. 128.7 pc (419.82 l.y.)
Coord 2000 |
18386+1632 |
|
Discov num |
HO 87 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 38 36.74 +16 32 27.7 |
|
Date first |
1883 |
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Date last |
2019 |
|
Obs |
115 |
|
Pa first |
259 |
|
Pa last |
95.6 |
|
P.A. Now (θ) |
99.5° |
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Sep first |
0.3 |
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Sep last |
0.45 |
|
Sep. Now (ρ) |
0.446" |
|
Mag pri |
8.34 |
|
Mag sec |
8.98 |
|
delta mag (ΔM) |
0.64 |
|
Spectral class |
G5 (yellow) |
|
Pri motion ra |
-051 |
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Sec motion ra |
|
|
Pri motion dec |
-063 |
|
Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
18386+1632 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
HD 172246 |
103945 |
18 38 37 +16 32 28 |
HO 87 AB |
2019 |
115 |
96 |
0.4 |
8.34 |
8.98 |
0.64 |
Y |
<=== |
Show |
|
103945 |
18 38 37 +16 32 28 |
HO 87 AC |
2015 |
9 |
121 |
47.3 |
8.34 |
14.17 |
5.83 |
|
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Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 172246 |
|
Constellation |
Hercules |
|
SAO |
103945 |
|
HIP |
91413 |
|
Tycho2 |
1570-02103-1 |
|
Gaia DR2 |
4511604454282166912 |
|
HD |
172246 |
|
ADS |
11530 |
|
BD |
BD+16 3572 |
|
Distance |
128.7 |
|
Distance ly |
419.82 |
|
ORBITAL ELEMENTS
Period (P) | 119.39y | |
Periastron (T) | 1972.37y | |
Semi-major axis (a) | 0.299a | |
Eccentricity (e) | 0.599 | |
Inclination (i) | 19.6° | |
Longitude of periastron (ω) | 78.8° | |
Node (Ω) | 210.5° | |
Notes | n | |
Reference | Msn2019 | |
Equinox | 2000 | |
Last observation | 2019 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
71.9 |
0.363 |
2001 |
73.4 |
0.369 |
2002 |
74.9 |
0.375 |
2003 |
76.3 |
0.381 |
2004 |
77.7 |
0.386 |
2005 |
79.1 |
0.391 |
2006 |
80.4 |
0.396 |
2007 |
81.6 |
0.400 |
2008 |
82.9 |
0.405 |
2009 |
84.1 |
0.409 |
2010 |
85.3 |
0.413 |
2011 |
86.5 |
0.416 |
2012 |
87.7 |
0.420 |
2013 |
88.8 |
0.423 |
2014 |
90.0 |
0.426 |
2015 |
91.1 |
0.429 |
2016 |
92.2 |
0.432 |
2017 |
93.2 |
0.435 |
2018 |
94.3 |
0.437 |
2019 |
95.4 |
0.439 |
2020 |
96.4 |
0.441 |
2021 |
97.5 |
0.443 |
2022 |
98.5 |
0.445 |
2023 |
99.5 |
0.446 |
2024 |
100.5 |
0.447 |
2025 |
101.6 |
0.448 |
2026 |
102.6 |
0.449 |
2027 |
103.6 |
0.450 |
2028 |
104.6 |
0.451 |
2029 |
105.6 |
0.451 |
2030 |
106.6 |
0.451 |
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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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