16420+7353 MLR 198 (HD 151746)
16h 41m 57.22s +73° 53' 14.3" P.A. 51.00 sep 0.2 mag 7.30,7.60 Sp A2 dist. 107.87 pc (351.87 l.y.)
Coord 2000 |
16420+7353 |
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Discov num |
MLR 198 |
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Comp |
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Coord arcsec 2000 |
16 41 57.22 +73 53 14.3 |
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Date first |
1971 |
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Date last |
2012 |
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Obs |
34 |
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Pa first |
36 |
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Pa last |
50.8 |
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P.A. Now (θ) |
33.6° |
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Sep first |
0.3 |
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Sep last |
0.196 |
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Sep. Now (ρ) |
0.285" |
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Mag pri |
7.30 |
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Mag sec |
7.60 |
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delta mag (ΔM) |
0.3 |
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Spectral class |
A2 (white) |
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Pri motion ra |
-015 |
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Sec motion ra |
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Pri motion dec |
+041 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 151746 |
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Constellation |
Draco |
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SAO |
8602 |
|
HIP |
81757 |
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Tycho2 |
4426-00098-1 |
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HD |
151746 |
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GC |
22548 |
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BD |
BD+74 680 |
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Distance |
107.87 |
|
Distance ly |
351.87 |
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ORBITAL ELEMENTS
Period (P) | 51.16y | |
Periastron (T) | 1993.69y | |
Semi-major axis (a) | 0.199a | |
Eccentricity (e) | 0.542 | |
Inclination (i) | 135.3° | |
Longitude of periastron (ω) | 322.4° | |
Node (Ω) | 192.7° | |
Notes | n | |
Reference | Hrt2014b | |
Equinox | 2000 | |
Last observation | 2009 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
128.6 |
0.127 |
2001 |
118.8 |
0.134 |
2002 |
110.0 |
0.141 |
2003 |
102.1 |
0.150 |
2004 |
95.1 |
0.159 |
2005 |
88.9 |
0.169 |
2006 |
83.4 |
0.179 |
2007 |
78.5 |
0.188 |
2008 |
74.0 |
0.198 |
2009 |
69.9 |
0.207 |
2010 |
66.2 |
0.217 |
2011 |
62.8 |
0.225 |
2012 |
59.7 |
0.234 |
2013 |
56.7 |
0.242 |
2014 |
54.0 |
0.249 |
2015 |
51.3 |
0.256 |
2016 |
48.9 |
0.262 |
2017 |
46.5 |
0.267 |
2018 |
44.2 |
0.272 |
2019 |
42.0 |
0.276 |
2020 |
39.8 |
0.280 |
2021 |
37.7 |
0.282 |
2022 |
35.6 |
0.284 |
2023 |
33.6 |
0.285 |
2024 |
31.5 |
0.285 |
2025 |
29.5 |
0.284 |
2026 |
27.4 |
0.282 |
2027 |
25.3 |
0.280 |
2028 |
23.1 |
0.276 |
2029 |
20.9 |
0.271 |
2030 |
18.6 |
0.265 |
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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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