18126+3836 BU 1091
18h 12m 36.71s +38° 35' 51.0" P.A. 319.00 sep 0.7 mag 8.66,9.24 Sp F8 dist. 145.99 pc (476.22 l.y.)
| Coord 2000 |
18126+3836 |
|
Discov num |
BU 1091 |
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Comp |
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Coord arcsec 2000 |
18 12 36.71 +38 35 51.0 |
|
| Date first |
1888 |
|
Date last |
2016 |
|
Obs |
59 |
|
| Pa first |
38 |
|
Pa last |
319 |
|
P.A. Now (θ) |
319° |
|
| Sep first |
0.5 |
|
Sep last |
0.745 |
|
Sep. Now (ρ) |
0.745" |
|
| Mag pri |
8.66 |
|
Mag sec |
9.24 |
|
delta mag (ΔM) |
0.58 |
|
Spectral class |
F8 (yellow-white) |
|
| Pri motion ra |
-020 |
|
Sec motion ra |
-020 |
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| Pri motion dec |
-018 |
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Sec motion dec |
-018 |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Hercules |
|
HIP |
89237 |
|
Tycho2 |
3103-01620-1 |
|
Gaia DR2 |
2109170241915883776 |
|
| ADS |
11170 |
|
BD |
BD+38 3109 |
|
Distance |
145.99 |
|
Distance ly |
476.22 |
|
ORBITAL ELEMENTS
| Period (P) | 1297y | |
Periastron (T) | 1933y | |
Semi-major axis (a) | 1.175a | |
| Eccentricity (e) | 0.896 | |
Inclination (i) | 138.5° | |
Longitude of periastron (ω) | 77.8° | |
| Node (Ω) | 172.9° | |
Notes | n | |
Reference | Zir2012b | |
| Equinox | 2000 | |
Last observation | 2010 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
322.9 |
0.671 |
| 2001 |
322.7 |
0.677 |
| 2002 |
322.4 |
0.682 |
| 2003 |
322.1 |
0.688 |
| 2004 |
321.9 |
0.694 |
| 2005 |
321.6 |
0.700 |
| 2006 |
321.3 |
0.705 |
| 2007 |
321.1 |
0.711 |
| 2008 |
320.8 |
0.716 |
| 2009 |
320.6 |
0.722 |
| 2010 |
320.3 |
0.727 |
| 2011 |
320.1 |
0.732 |
| 2012 |
319.9 |
0.738 |
| 2013 |
319.6 |
0.743 |
| 2014 |
319.4 |
0.748 |
| 2015 |
319.2 |
0.754 |
| 2016 |
319.0 |
0.759 |
| 2017 |
318.7 |
0.764 |
| 2018 |
318.5 |
0.769 |
| 2019 |
318.3 |
0.774 |
| 2020 |
318.1 |
0.779 |
| 2021 |
317.9 |
0.784 |
| 2022 |
317.7 |
0.789 |
| 2023 |
317.5 |
0.794 |
| 2024 |
317.3 |
0.799 |
| 2025 |
317.1 |
0.804 |
| 2026 |
316.9 |
0.809 |
| 2027 |
316.7 |
0.814 |
| 2028 |
316.5 |
0.818 |
| 2029 |
316.3 |
0.823 |
| 2030 |
316.1 |
0.828 |
|
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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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