16416+1513 USN 2
16h 41m 36.62s +15° 12' 37.0" P.A. 88.00 sep 0.1 mag 16.40,16.40 Sp DA+DA
Coord 2000 |
16416+1513 |
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Discov num |
USN 2 |
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Comp |
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Coord arcsec 2000 |
16 41 36.62 +15 12 37.0 |
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Date first |
2008 |
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Date last |
2010 |
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Obs |
3 |
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Pa first |
276 |
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Pa last |
88.3 |
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P.A. Now (θ) |
88.3° |
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Sep first |
0.0 |
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Sep last |
0.124 |
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Sep. Now (ρ) |
0.124" |
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Mag pri |
16.40 |
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Mag sec |
16.40 |
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delta mag (ΔM) |
0 |
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Spectral class |
DA+DA (white dwarf/white dwarf) |
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Pri motion ra |
+020 |
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Sec motion ra |
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Pri motion dec |
-673 |
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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
ORBITAL ELEMENTS
Period (P) | 4.03y | ± 0.018 |
Periastron (T) | 2008.54y | ± 0.03 |
Semi-major axis (a) | 98.76m | ± 5.65 |
Eccentricity (e) | 0.74 | ± 0.032 |
Inclination (i) | 83.2° | ± 0.3 |
Longitude of periastron (ω) | 49.4° | ± 1.6 |
Node (Ω) | 91.6° | ± 0.3 |
Notes | n | |
Reference | USN2013b | |
Equinox | 2000 | |
Last observation | 2012 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
38.4 |
0.014 |
2001 |
272.4 |
0.097 |
2002 |
277.1 |
0.128 |
2003 |
283.1 |
0.084 |
2004 |
26.0 |
0.012 |
2005 |
272.1 |
0.093 |
2006 |
277.0 |
0.128 |
2007 |
282.8 |
0.087 |
2008 |
12.0 |
0.012 |
2009 |
271.9 |
0.090 |
2010 |
276.9 |
0.129 |
2011 |
282.5 |
0.088 |
2012 |
357.6 |
0.012 |
2013 |
271.6 |
0.086 |
2014 |
276.8 |
0.129 |
2015 |
282.2 |
0.090 |
2016 |
344.5 |
0.013 |
2017 |
271.3 |
0.082 |
2018 |
276.6 |
0.129 |
2019 |
282.0 |
0.092 |
2020 |
333.6 |
0.015 |
2021 |
271.0 |
0.078 |
2022 |
276.5 |
0.130 |
2023 |
281.8 |
0.094 |
2024 |
325.0 |
0.016 |
2025 |
270.6 |
0.073 |
2026 |
276.4 |
0.130 |
2027 |
281.5 |
0.096 |
2028 |
318.2 |
0.019 |
2029 |
270.2 |
0.068 |
2030 |
276.3 |
0.130 |
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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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