18540+3723 BU 137 AB (HD 175491)
18h 53m 57.56s +37° 22' 49.7" P.A. 167.00 sep 1.6 mag 8.69,9.02 Sp G5III-IV
| Coord 2000 |
18540+3723 |
|
Discov num |
BU 137 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 53 57.56 +37 22 49.7 |
|
| Date first |
1873 |
|
Date last |
2022 |
|
Obs |
136 |
|
| Pa first |
140 |
|
Pa last |
166.5 |
|
P.A. Now (θ) |
166.5° |
|
| Sep first |
1.5 |
|
Sep last |
1.566 |
|
Sep. Now (ρ) |
1.566" |
|
| Mag pri |
8.69 |
|
Mag sec |
9.02 |
|
delta mag (ΔM) |
0.33 |
|
Spectral class |
G5III-IV (yellow) |
|
| Pri motion ra |
-016 |
|
Sec motion ra |
-016 |
|
| Pri motion dec |
+045 |
|
Sec motion dec |
+045 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
18540+3723 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 175491 |
67544 |
18 53 58 +37 22 50 |
BU 137 AB |
2022 |
136 |
167 |
1.6 |
8.69 |
9.02 |
0.33 |
Y |
<=== |
| Show |
|
67544 |
18 53 58 +37 22 50 |
BU 137 AC |
2015 |
20 |
146 |
23.6 |
8.69 |
12.00 |
3.31 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 175491 |
|
Constellation |
Lyra |
|
SAO |
67544 |
|
Tycho2 |
2650-01881-1 |
|
| Gaia DR2 |
2094001134684220800 |
|
HD |
175491 |
|
ORBITAL ELEMENTS
| Period (P) | 1135.7351y | ± 534.7085 |
Periastron (T) | 2080.596y | ± 24.2257 |
Semi-major axis (a) | 3.61436a | ± 1.77418 |
| Eccentricity (e) | 0.77425 | ± 0.20302 |
Inclination (i) | 76.953° | ± 8.455 |
Longitude of periastron (ω) | 69.393° | ± 20.21 |
| Node (Ω) | 177.051° | ± 6.145 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
160.3 |
1.554 |
| 2001 |
160.5 |
1.554 |
| 2002 |
160.8 |
1.555 |
| 2003 |
161.0 |
1.555 |
| 2004 |
161.3 |
1.555 |
| 2005 |
161.5 |
1.555 |
| 2006 |
161.8 |
1.555 |
| 2007 |
162.0 |
1.554 |
| 2008 |
162.2 |
1.554 |
| 2009 |
162.5 |
1.553 |
| 2010 |
162.7 |
1.552 |
| 2011 |
163.0 |
1.551 |
| 2012 |
163.2 |
1.550 |
| 2013 |
163.5 |
1.549 |
| 2014 |
163.7 |
1.547 |
| 2015 |
164.0 |
1.546 |
| 2016 |
164.2 |
1.544 |
| 2017 |
164.5 |
1.542 |
| 2018 |
164.7 |
1.539 |
| 2019 |
165.0 |
1.537 |
| 2020 |
165.2 |
1.534 |
| 2021 |
165.5 |
1.531 |
| 2022 |
165.7 |
1.528 |
| 2023 |
166.0 |
1.524 |
| 2024 |
166.2 |
1.521 |
| 2025 |
166.5 |
1.517 |
| 2026 |
166.7 |
1.513 |
| 2027 |
167.0 |
1.508 |
| 2028 |
167.3 |
1.503 |
| 2029 |
167.5 |
1.498 |
| 2030 |
167.8 |
1.493 |
|
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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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