19098-1948 B 427 (HD 178555)
19h 09m 48.13s -19° 48' 12.4" P.A. 183.00 sep 0.1 mag 7.00,7.10 Sp K2IV dist. 118.48 pc (386.48 l.y.)
Coord 2000 |
19098-1948 |
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Discov num |
B 427 |
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Comp |
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Coord arcsec 2000 |
19 09 48.13 -19 48 12.4 |
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Date first |
1925 |
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Date last |
2007 |
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Obs |
19 |
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Pa first |
276 |
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Pa last |
182.9 |
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P.A. Now (θ) |
182.9° |
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Sep first |
0.1 |
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Sep last |
0.05 |
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Sep. Now (ρ) |
0.05" |
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Mag pri |
7.00 |
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Mag sec |
7.10 |
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delta mag (ΔM) |
0.1 |
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Spectral class |
K2IV (yellow-orange) |
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Pri motion ra |
+028 |
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Sec motion ra |
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Pri motion dec |
-084 |
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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 178555 |
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Constellation |
Sagittarius |
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SAO |
162260 |
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HIP |
94144 |
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Tycho2 |
6291-01794-1 |
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Gaia DR2 |
4083941366486236288 |
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HD |
178555 |
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HR |
7265 |
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GC |
26389 |
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ADS |
12096 |
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BD |
BD-20 5415 |
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Distance |
118.48 |
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Distance ly |
386.48 |
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ORBITAL ELEMENTS
Period (P) | 2.68y | |
Periastron (T) | 1931.81y | |
Semi-major axis (a) | 0.129a | |
Eccentricity (e) | 0.53 | |
Inclination (i) | 45.6° | |
Longitude of periastron (ω) | 86.1° | |
Node (Ω) | 45° | |
Notes | n | |
Reference | Vor1934 | |
Equinox | | |
Last observation | | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
299.1 |
0.140 |
2001 |
13.8 |
0.120 |
2002 |
251.2 |
0.127 |
2003 |
321.3 |
0.137 |
2004 |
54.9 |
0.079 |
2005 |
274.7 |
0.139 |
2006 |
344.6 |
0.133 |
2007 |
204.5 |
0.072 |
2008 |
296.4 |
0.140 |
2009 |
10.2 |
0.123 |
2010 |
247.8 |
0.124 |
2011 |
318.5 |
0.137 |
2012 |
47.2 |
0.087 |
2013 |
271.9 |
0.138 |
2014 |
341.6 |
0.134 |
2015 |
192.4 |
0.061 |
2016 |
293.7 |
0.140 |
2017 |
6.8 |
0.125 |
2018 |
244.2 |
0.120 |
2019 |
315.7 |
0.138 |
2020 |
40.8 |
0.094 |
2021 |
269.2 |
0.137 |
2022 |
338.6 |
0.134 |
2023 |
175.3 |
0.051 |
2024 |
291.0 |
0.140 |
2025 |
3.4 |
0.126 |
2026 |
240.4 |
0.116 |
2027 |
312.9 |
0.138 |
2028 |
35.2 |
0.101 |
2029 |
266.3 |
0.136 |
2030 |
335.7 |
0.135 |
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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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