18305-2848 HDS 2624 (HD 170415)
18h 30m 31.02s -28° 47' 42.9" P.A. 230.00 sep 0.1 mag 8.47,8.71 Sp A1IV/V dist. 158.98 pc (518.59 l.y.)
Coord 2000 |
18305-2848 |
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Discov num |
HDS2624 |
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Comp |
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Coord arcsec 2000 |
18 30 31.02 -28 47 42.9 |
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Date first |
1991 |
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Date last |
2021 |
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Obs |
10 |
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Pa first |
197 |
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Pa last |
229.8 |
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P.A. Now (θ) |
226.3° |
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Sep first |
0.1 |
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Sep last |
0.125 |
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Sep. Now (ρ) |
0.141" |
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Mag pri |
8.47 |
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Mag sec |
8.71 |
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delta mag (ΔM) |
0.24 |
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Spectral class |
A1IV/V (white) |
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Pri motion ra |
-008 |
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Sec motion ra |
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Pri motion dec |
-016 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 170415 |
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Constellation |
Sagittarius |
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SAO |
186892 |
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HIP |
90715 |
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Tycho2 |
6869-00432-1 |
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Gaia DR2 |
4048486716386440192 |
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HD |
170415 |
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GC |
25243 |
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CD |
CD-2814648 |
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CP |
CP-28 6576 |
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Distance |
158.98 |
|
Distance ly |
518.59 |
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ORBITAL ELEMENTS
Period (P) | 42.93y | ± 10.94 |
Periastron (T) | 2007.53y | ± 1.05 |
Semi-major axis (a) | 0.0979a | ± 0.0211 |
Eccentricity (e) | 0.531 | ± 0.104 |
Inclination (i) | 144.5° | ± 33.2 |
Longitude of periastron (ω) | 14° | ± 24.7 |
Node (Ω) | 42.3° | ± 22.1 |
Notes | | |
Reference | Tok2015c | |
Equinox | 2000 | |
Last observation | 2014 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
157.5 |
0.085 |
2001 |
149.1 |
0.077 |
2002 |
138.7 |
0.070 |
2003 |
125.9 |
0.062 |
2004 |
110.1 |
0.056 |
2005 |
91.1 |
0.052 |
2006 |
69.1 |
0.049 |
2007 |
44.7 |
0.047 |
2008 |
18.0 |
0.045 |
2009 |
349.6 |
0.044 |
2010 |
322.9 |
0.048 |
2011 |
301.6 |
0.055 |
2012 |
285.8 |
0.064 |
2013 |
274.1 |
0.074 |
2014 |
265.1 |
0.084 |
2015 |
258.0 |
0.093 |
2016 |
252.1 |
0.102 |
2017 |
247.1 |
0.109 |
2018 |
242.8 |
0.117 |
2019 |
238.9 |
0.123 |
2020 |
235.4 |
0.129 |
2021 |
232.2 |
0.133 |
2022 |
229.2 |
0.138 |
2023 |
226.3 |
0.141 |
2024 |
223.6 |
0.144 |
2025 |
220.9 |
0.146 |
2026 |
218.4 |
0.148 |
2027 |
215.8 |
0.148 |
2028 |
213.3 |
0.149 |
2029 |
210.8 |
0.148 |
2030 |
208.3 |
0.147 |
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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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