00446-1856 HDS  99Aa,Ab

 
 
00H 44M 37.15S -18 56' 48.2" P.A. 248 SEP 0.2 MAG 11.46,11.74 SP DM2 DIST. 31.44 PC (102.56 L.Y.)
 
 
Coord 2000
00446-1856
Discov num
HDS  99
Comp
Aa,Ab
Coord arcsec 2000
00 44 37.15 -18 56 48.2
Date first
1991
Date last
2015
Obs
8
Pa first
13
Pa last
248
P.A. Now (θ)
248°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.2"
Mag pri
11.46
Mag sec
11.74
delta mag (ΔM)
0.28
Spectral class
dM2
Pri motion ra
+271
Sec motion ra
Pri motion dec
+183
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
00446-1856 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 00446-1856 HDS 99 Aa,Ab 1991 2015 8 248 0.2 11.46 11.74 0.28 Y <===
Show 00446-1856 LDS3195 AB 1960 2007 6 242 146.6 10.93 10.42 0.51
Show 00446-1856 LDS3195 AC 1960 2010 6 240 35.4 10.74 15.90 5.16
Quadruple system
3 visible 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
last precise pa
247.6
last precise sep
0.193
 
 
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)± 26
Node (Ω)66°± 25 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2015
label rho theta
2000 0.189 221.2
2001 0.164 201.4
2002 0.123 170.9
2003 0.073 98.8
2004 0.090 340.2
2005 0.141 291.3
2006 0.176 266.5
2007 0.194 248.5
2008 0.197 232.3
2009 0.183 215.2
2010 0.152 193.0
2011 0.105 154.7
2012 0.067 54.9
2013 0.108 318.6
2014 0.155 281.7
2015 0.184 260.1
2016 0.197 243.1
2017 0.194 226.9
2018 0.175 208.6
2019 0.138 183.2
2020 0.088 132.0
2021 0.074 11.8
2022 0.125 303.1
2023 0.166 273.6
2024 0.190 254.2
2025 0.198 237.7
2026 0.189 221.2
2027 0.164 201.4
2028 0.123 170.9
2029 0.073 99.0
2030 0.090 340.2

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic