11297-0619 A 7 (HD 99917)
11h 29m 43.17s -06° 18' 31.3" P.A. 134.00 sep 0.2 mag 9.70,9.70 Sp F8
Coord 2000 |
11297-0619 |
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Discov num |
A 7 |
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Comp |
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Coord arcsec 2000 |
11 29 43.17 -06 18 31.3 |
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Date first |
1899 |
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Date last |
2018 |
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Obs |
20 |
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Pa first |
264 |
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Pa last |
134.1 |
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P.A. Now (θ) |
134.1° |
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Sep first |
0.5 |
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Sep last |
0.165 |
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Sep. Now (ρ) |
0.165" |
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Mag pri |
9.70 |
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Mag sec |
9.70 |
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delta mag (ΔM) |
0 |
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Spectral class |
F8 (yellow-white) |
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Pri motion ra |
-014 |
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Sec motion ra |
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Pri motion dec |
-012 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 99917 |
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Constellation |
Leo |
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SAO |
138235 |
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Tycho2 |
4929-01083-1 |
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Gaia DR2 |
3785426983187269632 |
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HD |
99917 |
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ADS |
8182 |
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ORBITAL ELEMENTS
Period (P) | 204.32y | ± 11.2 |
Periastron (T) | 2050.54y | ± 19.37 |
Semi-major axis (a) | 0.447a | ± 0.077 |
Eccentricity (e) | 0.656 | ± 0.017 |
Inclination (i) | 105.1° | ± 5.8 |
Longitude of periastron (ω) | 59.8° | ± 13.4 |
Node (Ω) | 93.3° | ± 4.9 |
Notes | | |
Reference | Tok2015c | |
Equinox | 2000 | |
Last observation | 2014 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
188.6 |
0.157 |
2001 |
185.8 |
0.155 |
2002 |
182.8 |
0.153 |
2003 |
179.9 |
0.152 |
2004 |
176.8 |
0.151 |
2005 |
173.8 |
0.150 |
2006 |
170.7 |
0.150 |
2007 |
167.6 |
0.150 |
2008 |
164.5 |
0.150 |
2009 |
161.5 |
0.151 |
2010 |
158.5 |
0.152 |
2011 |
155.5 |
0.154 |
2012 |
152.6 |
0.156 |
2013 |
149.8 |
0.158 |
2014 |
147.0 |
0.160 |
2015 |
144.4 |
0.163 |
2016 |
141.8 |
0.165 |
2017 |
139.3 |
0.168 |
2018 |
136.9 |
0.172 |
2019 |
134.6 |
0.175 |
2020 |
132.4 |
0.179 |
2021 |
130.3 |
0.182 |
2022 |
128.2 |
0.186 |
2023 |
126.3 |
0.190 |
2024 |
124.4 |
0.193 |
2025 |
122.6 |
0.197 |
2026 |
120.8 |
0.201 |
2027 |
119.1 |
0.204 |
2028 |
117.5 |
0.207 |
2029 |
115.9 |
0.211 |
2030 |
114.4 |
0.214 |
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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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