00090-5400 HDO 181

 
 
00H 09M 02.35S -54 00' 07.1" P.A. 23.4 SEP 0.39 MAG 6.74,8.07 SP G4IV DIST. 128.37 PC (418.74 L.Y.)
 
 
Coord 2000
00090-5400
Discov num
HDO 181
Comp
Coord arcsec 2000
00 09 02.35 -54 00 07.1
Date first
1897
Date last
2015
Obs
46
Pa first
300
Pa last
21
P.A. Now (θ)
23.4°
Sep first
1.2
Sep last
0.4
Sep. Now (ρ)
0.39"
Mag pri
6.74
Mag sec
8.07
delta mag (ΔM)
1.33
Spectral class
G4IV (yellow)
Pri motion ra
+047
Sec motion ra
Pri motion dec
+017
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Phoenix
SAO
231943
HIP
730
Tycho2
8464-00766-1
HD
469
HR
23
CP
CP-54 19
Distance
128.37
Distance ly
418.74
last precise pa
20.9
last precise sep
0.365
 
 
ORBITAL ELEMENTS
 
 
Period (P)221y± 78 Periastron (T)1978.71y± 1.9 Semi-major axis (a)0.42a± 0.13
Eccentricity (e)0.406± 0.12 Inclination (i)154.1°± 14 Longitude of periastron (ω)25.3°± 11
Node (Ω)161.6°± 9 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1999
label rho theta
2000 0.287 59.7
2001 0.293 56.9
2002 0.298 54.2
2003 0.304 51.6
2004 0.309 49.1
2005 0.315 46.7
2006 0.321 44.3
2007 0.327 42.1
2008 0.333 39.9
2009 0.339 37.8
2010 0.345 35.8
2011 0.351 33.9
2012 0.357 32.0
2013 0.363 30.2
2014 0.369 28.4
2015 0.375 26.7
2016 0.381 25.0
2017 0.387 23.4
2018 0.393 21.9
2019 0.399 20.4
2020 0.404 18.9
2021 0.410 17.5
2022 0.416 16.1
2023 0.421 14.8
2024 0.427 13.4
2025 0.432 12.2
2026 0.437 10.9
2027 0.442 9.7
2028 0.448 8.5
2029 0.453 7.3
2030 0.458 6.2

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