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 |
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Discov num |
BU 1091 |
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Comp |
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Coord arcsec 2000 |
18 12 36.71 +38 35 51.0 |
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Date first |
1888 |
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Date last |
2016 |
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Obs |
59 |
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Pa first |
38 |
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Pa last |
319 |
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P.A. Now (θ) |
319° |
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Sep first |
0.5 |
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Sep last |
0.745 |
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Sep. Now (ρ) |
0.745" |
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Mag pri |
8.66 |
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Mag sec |
9.24 |
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delta mag (ΔM) |
0.58 |
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Spectral class |
F8 (yellow-white) |
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Pri motion ra |
-020 |
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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 |
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HIP |
89237 |
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Tycho2 |
3103-01620-1 |
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Gaia DR2 |
2109170241915883776 |
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ADS |
11170 |
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BD |
BD+38 3109 |
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Distance |
145.99 |
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Distance ly |
476.22 |
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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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