18178+4351 A 578 Aa,Ab
18h 17m 49.51s +43° 50' 32.0" P.A. 244.00 sep 0.3 mag 9.55,10.64 Sp F8 dist. 129.03 pc (420.9 l.y.)
Coord 2000 |
18178+4351 |
|
Discov num |
A 578 |
|
Comp |
Aa,Ab |
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Coord arcsec 2000 |
18 17 49.51 +43 50 32.0 |
|
Date first |
1903 |
|
Date last |
2014 |
|
Obs |
42 |
|
Pa first |
28 |
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Pa last |
243.7 |
|
P.A. Now (θ) |
243.7° |
|
Sep first |
0.2 |
|
Sep last |
0.33 |
|
Sep. Now (ρ) |
0.33" |
|
Mag pri |
9.55 |
|
Mag sec |
10.64 |
|
delta mag (ΔM) |
1.09 |
|
Spectral class |
F8 (yellow-white) |
|
Pri motion ra |
-019 |
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Sec motion ra |
|
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Pri motion dec |
-010 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
18178+4351 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
|
18 17 50 +43 50 32 |
A 578 Aa,Ab |
2014 |
42 |
244 |
0.3 |
9.55 |
10.64 |
1.09 |
Y |
<=== |
Show |
|
|
18 17 50 +43 50 32 |
A 578 AB |
2014 |
26 |
167 |
1.8 |
9.13 |
12.24 |
3.11 |
|
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Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Lyra |
|
HIP |
89655 |
|
Tycho2 |
3115-00363-1 |
|
Gaia DR2 |
2114710062530870912 |
|
ADS |
11247 |
|
BD |
BD+43 2938 |
|
Distance |
129.03 |
|
Distance ly |
420.9 |
|
ORBITAL ELEMENTS
Period (P) | 143.769y | |
Periastron (T) | 2032.26y | |
Semi-major axis (a) | 0.2859a | |
Eccentricity (e) | 0.6032 | |
Inclination (i) | 121.1° | |
Longitude of periastron (ω) | 262.7° | |
Node (Ω) | 27° | |
Notes | | |
Reference | Ole2001 | |
Equinox | | |
Last observation | 1997 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
249.6 |
0.235 |
2001 |
248.0 |
0.235 |
2002 |
246.5 |
0.235 |
2003 |
245.0 |
0.234 |
2004 |
243.4 |
0.234 |
2005 |
241.9 |
0.234 |
2006 |
240.3 |
0.233 |
2007 |
238.8 |
0.232 |
2008 |
237.2 |
0.232 |
2009 |
235.6 |
0.230 |
2010 |
234.0 |
0.229 |
2011 |
232.4 |
0.228 |
2012 |
230.8 |
0.226 |
2013 |
229.1 |
0.223 |
2014 |
227.4 |
0.221 |
2015 |
225.6 |
0.218 |
2016 |
223.8 |
0.215 |
2017 |
222.0 |
0.211 |
2018 |
220.0 |
0.206 |
2019 |
218.0 |
0.201 |
2020 |
215.9 |
0.196 |
2021 |
213.6 |
0.189 |
2022 |
211.2 |
0.182 |
2023 |
208.5 |
0.174 |
2024 |
205.5 |
0.164 |
2025 |
202.2 |
0.154 |
2026 |
198.3 |
0.142 |
2027 |
193.7 |
0.129 |
2028 |
188.1 |
0.115 |
2029 |
180.7 |
0.100 |
2030 |
170.7 |
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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