00446-1856 HDS 99 Aa,Ab
00h 44m 37.15s -18° 56' 48.2" P.A. 316.00 sep 0.1 mag 11.46,11.74 Sp dM2 dist. 31.44 pc (102.56 l.y.)
Coord 2000 |
00446-1856 |
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Discov num |
HDS 99 |
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Comp |
Aa,Ab |
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Coord arcsec 2000 |
00 44 37.15 -18 56 48.2 |
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Date first |
1991 |
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Date last |
2021 |
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Obs |
15 |
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Pa first |
13 |
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Pa last |
315.6 |
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P.A. Now (θ) |
273.6° |
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Sep first |
0.2 |
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Sep last |
0.11 |
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Sep. Now (ρ) |
0.166" |
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Mag pri |
11.46 |
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Mag sec |
11.74 |
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delta mag (ΔM) |
0.28 |
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Spectral class |
dM2 |
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Pri motion ra |
+271 |
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Sec motion ra |
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Pri motion dec |
+183 |
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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.
00446-1856 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
|
00 44 37 -18 56 48 |
HDS 99 Aa,Ab |
2021 |
15 |
316 |
0.1 |
11.46 |
11.74 |
0.28 |
Y |
<=== |
Show |
|
|
00 44 37 -18 56 48 |
LDS 3195 AB |
2007 |
6 |
242 |
146.6 |
10.93 |
10.42 |
0.51 |
|
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Show |
|
|
00 44 37 -18 56 48 |
LDS 3195 AC |
2015 |
7 |
240 |
35.4 |
10.74 |
15.90 |
5.16 |
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Quadruple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Cetus |
|
HIP |
3493 |
|
Tycho2 |
5849-00610-1 |
|
GL |
Gl 31.2A |
|
BD |
BD-19 111 |
|
Distance |
31.44 |
|
Distance ly |
102.56 |
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ORBITAL ELEMENTS
Period (P) | 8.667y | ± 0.065 |
Periastron (T) | 2011.977y | ± 0.023 |
Semi-major axis (a) | 132.4m | ± 1.2 |
Eccentricity (e) | 0.493 | ± 0.01 |
Inclination (i) | 171.5° | ± 6.6 |
Longitude of periastron (ω) | 8° | ± 26 |
Node (Ω) | 66° | ± 25 |
Notes | n | |
Reference | Hor2017 | |
Equinox | 2000 | |
Last observation | 2015 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
221.2 |
0.189 |
2001 |
201.4 |
0.164 |
2002 |
170.9 |
0.123 |
2003 |
98.8 |
0.073 |
2004 |
340.2 |
0.090 |
2005 |
291.3 |
0.141 |
2006 |
266.5 |
0.176 |
2007 |
248.5 |
0.194 |
2008 |
232.3 |
0.197 |
2009 |
215.2 |
0.183 |
2010 |
193.0 |
0.152 |
2011 |
154.7 |
0.105 |
2012 |
54.9 |
0.067 |
2013 |
318.6 |
0.108 |
2014 |
281.7 |
0.155 |
2015 |
260.1 |
0.184 |
2016 |
243.1 |
0.197 |
2017 |
226.9 |
0.194 |
2018 |
208.6 |
0.175 |
2019 |
183.2 |
0.138 |
2020 |
132.0 |
0.088 |
2021 |
11.8 |
0.074 |
2022 |
303.1 |
0.125 |
2023 |
273.6 |
0.166 |
2024 |
254.2 |
0.190 |
2025 |
237.7 |
0.198 |
2026 |
221.2 |
0.189 |
2027 |
201.4 |
0.164 |
2028 |
170.9 |
0.123 |
2029 |
99.0 |
0.073 |
2030 |
340.2 |
0.090 |
2031 |
291.3 |
0.141 |
2032 |
266.5 |
0.176 |
2033 |
248.5 |
0.194 |
2034 |
232.4 |
0.197 |
2035 |
215.2 |
0.183 |
2036 |
193.1 |
0.152 |
2037 |
154.8 |
0.105 |
2038 |
55.0 |
0.067 |
2039 |
318.6 |
0.108 |
2040 |
281.8 |
0.155 |
2041 |
260.1 |
0.184 |
2042 |
243.1 |
0.197 |
2043 |
226.9 |
0.194 |
2044 |
208.7 |
0.175 |
2045 |
183.2 |
0.138 |
2046 |
132.1 |
0.088 |
2047 |
12.0 |
0.074 |
2048 |
303.2 |
0.125 |
2049 |
273.7 |
0.166 |
2050 |
254.2 |
0.190 |
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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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