12155-3106 RST1658

 
 
12h 15m 26.96s -31 05' 38.2" P.A. 177.5 sep 0.56 mag 10.17,11.32 Sp K7V dist. 21.4 pc (69.81 l.y.)
 
 
Coord 2000
12155-3106
Discov num
RST1658
Comp
Coord arcsec 2000
12 15 26.96 -31 05 38.2
Date first
1931
Date last
2014
Obs
24
Pa first
82
Pa last
154
P.A. Now (θ)
177.5°
Sep first
0.4
Sep last
0.6
Sep. Now (ρ)
0.56"
Mag pri
10.17
Mag sec
11.32
delta mag (ΔM)
1.15
Spectral class
K7V (yellow-orange)
Pri motion ra
+164
Sec motion ra
Pri motion dec
-074
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
153.6
Precise sep
0.649
Constellation
Hydra
SAO
203284
HIP
59780
Tycho2
7232-00584-1
Gaia DR2
72258777088
HD
106549
CD
CD-30 9789
CP
CP-30 3447
Distance
21.4
Distance ly
69.81
last precise pa
153.6
last precise sep
0.649
 
 
ORBITAL ELEMENTS
 
 
Period (P)62y± 0.2 Periastron (T)2047.37y± 0.2 Semi-major axis (a)0.68a± 0.004
Eccentricity (e)0.226± 0.003 Inclination (i)51.4°± 0.5 Longitude of periastron (ω)240.7°± 1
Node (Ω)116.9°± 0.5 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2018
label rho theta
2000 0.696 111.4
2001 0.715 114.7
2002 0.729 117.8
2003 0.740 120.8
2004 0.747 123.8
2005 0.751 126.7
2006 0.750 129.6
2007 0.747 132.5
2008 0.741 135.4
2009 0.732 138.4
2010 0.720 141.5
2011 0.707 144.7
2012 0.691 148.1
2013 0.674 151.6
2014 0.656 155.3
2015 0.637 159.2
2016 0.617 163.3
2017 0.598 167.7
2018 0.579 172.5
2019 0.561 177.5
2020 0.544 182.8
2021 0.529 188.5
2022 0.517 194.5
2023 0.508 200.7
2024 0.501 207.1
2025 0.498 213.7
2026 0.498 220.2
2027 0.502 226.8
2028 0.508 233.2
2029 0.517 239.4
2030 0.528 245.4

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

grafico orbita





wds12155-3106c.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
12155-3106 RST1658 1996 23 95 0.6 10.17 11.32 K7V NOD 121526.96-310538.2
12155-3106 RST1658 2014 24 154 0.6 10.17 11.32 K7V O 121526.96-310538.2

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