13377-2337 RST2856

 
 
13h 37m 43.02s -23 36' 31.7" P.A. 287.30 sep 0.3 mag 10.30,10.30 Sp G5
 
 
Coord 2000
13377-2337
Discov num
RST2856
Comp
Coord arcsec 2000
13 37 43.02 -23 36 31.7
Date first
1935
Date last
2016
Obs
9
Pa first
116
Pa last
286
P.A. Now (θ)
287.3°
Sep first
0.2
Sep last
0.4
Sep. Now (ρ)
0.34"
Mag pri
10.30
Mag sec
10.30
delta mag (ΔM)
0
Spectral class
G5 (yellow)
Pri motion ra
-137
Sec motion ra
Pri motion dec
-010
Sec motion dec
Notes
N O (See Notes, Orbital solution)
Visually invisible, K-band or other infrared star This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
285.7
Precise sep
0.356
Constellation
Hydra
SAO
181811
Tycho2
6714-00795-1
last precise pa
285.7
last precise sep
0.356
 
 
ORBITAL ELEMENTS
 
 
Period (P)122y Periastron (T)2038.6y Semi-major axis (a)0.352a
Eccentricity (e)0.55 Inclination (i)81.9° Longitude of periastron (ω)290.2°
Node (Ω)108.7° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.350 280.6
2001 0.353 281.0
2002 0.357 281.3
2003 0.360 281.7
2004 0.363 282.0
2005 0.365 282.3
2006 0.367 282.6
2007 0.368 283.0
2008 0.369 283.3
2009 0.370 283.6
2010 0.370 283.9
2011 0.369 284.2
2012 0.368 284.5
2013 0.366 284.9
2014 0.364 285.2
2015 0.361 285.5
2016 0.357 285.8
2017 0.353 286.2
2018 0.348 286.5
2019 0.342 286.9
2020 0.335 287.3
2021 0.327 287.7
2022 0.318 288.1
2023 0.307 288.5
2024 0.296 289.0
2025 0.283 289.5
2026 0.269 290.1
2027 0.254 290.7
2028 0.237 291.4
2029 0.218 292.2
2030 0.197 293.2

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






wds13377-2337b.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
13377-2337 RST2856 1991 7 131 0.2 10.30 10.30 G5 NO 133743.02-233631.7
13377-2337 RST2856 2008 8 104 0.4 10.30 10.30 G5 NO 133743.02-233631.7
13377-2337 RST2856 2016 9 286 0.4 10.30 10.30 G5 NO 133743.02-233631.7

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