12274-2843 B   228

 
 
12h 27m 26.42s -28 42' 58.4" P.A. 129.9 sep 0.28 mag 8.18,8.39 Sp A9V dist. 90.09 pc (293.87 l.y.)
 
 
Coord 2000
12274-2843
Discov num
B   228
Comp
Coord arcsec 2000
12 27 26.42 -28 42 58.4
Date first
1926
Date last
2017
Obs
30
Pa first
134
Pa last
126
P.A. Now (θ)
129.9°
Sep first
0.3
Sep last
0.3
Sep. Now (ρ)
0.28"
Mag pri
8.18
Mag sec
8.39
delta mag (ΔM)
0.21
Spectral class
A9V (white)
Pri motion ra
-059
Sec motion ra
Pri motion dec
+002
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
126.2
Precise sep
0.274
Cdsa2 id
B 228
Constellation
Hydra
SAO
180809
HIP
60775
Tycho2
6694-01109-1
HD
108410
ADS
8555
CD
CD-28 9503
CP
CP-28 4470
Ra deg
12.457338888888888
De deg
-28.71622222222222
Distance
90.09
Distance ly
293.87
last precise pa
126.2
last precise sep
0.274
 
 
ORBITAL ELEMENTS
 
 
Period (P)44.483y± 6.249 Periastron (T)1952.295y± 1.251 Semi-major axis (a)0.173a± 0.107
Eccentricity (e)0.666± 0.077 Inclination (i)63.6°± 12 Longitude of periastron (ω)164.9°± 12.6
Node (Ω)137.8°± 10.6 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2006
label rho theta
2000 0.050 42.9
2001 0.063 68.9
2002 0.081 84.9
2003 0.100 94.8
2004 0.119 101.6
2005 0.138 106.4
2006 0.156 110.2
2007 0.172 113.1
2008 0.188 115.6
2009 0.202 117.8
2010 0.215 119.6
2011 0.226 121.3
2012 0.237 122.8
2013 0.247 124.1
2014 0.255 125.4
2015 0.262 126.6
2016 0.268 127.8
2017 0.273 128.8
2018 0.277 129.9
2019 0.280 130.9
2020 0.282 132.0
2021 0.283 133.0
2022 0.282 134.0
2023 0.280 135.0
2024 0.277 136.0
2025 0.273 137.1
2026 0.268 138.2
2027 0.261 139.3
2028 0.253 140.5
2029 0.243 141.9
2030 0.232 143.3

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

grafico orbita





wds12274-2843b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
12274-2843 B 228 2006 28 106 0.1 8.18 8.39 A9V NO 122726.42-284258.4
12274-2843 B 228 2009 29 114 0.2 8.18 8.39 A9V NO 122726.42-284258.4
12274-2843 B 228 2017 30 126 0.3 8.18 8.39 A9V NO 122726.42-284258.4

If you need more information about this double, apply for a data request form to the WDS.