00090-5400 HDO 181

 
 
00h 09m 02.35s -54 00' 07.1" P.A. 11.60 sep 0.4 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
2018
Obs
47
Pa first
300
Pa last
15
P.A. Now (θ)
11.6°
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
 
 
Precise pa
15.4
Precise sep
0.382
Constellation
Phoenix
SAO
231943
HIP
730
Tycho2
8464-00766-1
Gaia DR2
64959730816
HD
469
HR
23
CP
CP-54 19
Distance
128.37
Distance ly
418.74
last precise pa
15.4
last precise sep
0.382
 
 
ORBITAL ELEMENTS
 
 
Period (P)201.9y Periastron (T)1981.29y Semi-major axis (a)0.4a
Eccentricity (e)0.38 Inclination (i)158.6° Longitude of periastron (ω)13.2°
Node (Ω)141.5° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2018
label rho theta
2000 0.282 59.1
2001 0.286 56.1
2002 0.291 53.1
2003 0.295 50.2
2004 0.300 47.5
2005 0.305 44.8
2006 0.310 42.2
2007 0.315 39.7
2008 0.320 37.2
2009 0.325 34.9
2010 0.331 32.6
2011 0.336 30.4
2012 0.341 28.2
2013 0.347 26.2
2014 0.352 24.2
2015 0.358 22.2
2016 0.363 20.3
2017 0.368 18.5
2018 0.374 16.7
2019 0.379 15.0
2020 0.384 13.3
2021 0.390 11.6
2022 0.395 10.0
2023 0.400 8.5
2024 0.405 7.0
2025 0.410 5.5
2026 0.415 4.0
2027 0.420 2.6
2028 0.425 1.2
2029 0.429 359.9
2030 0.434 358.6

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






wds00090-5400d.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
00090-5400 HDO 181 2001 38 234 0.3 6.74 8.07 G4IV NOD 000902.35-540007.1
00090-5400 HDO 181 2008 44 35 0.3 6.74 8.07 G4IV NOD 000902.35-540007.1
00090-5400 HDO 181 2015 46 21 0.4 6.74 8.07 G4IV NO 000902.35-540007.1
00090-5400 HDO 181 2018 47 15 0.4 6.74 8.07 G4IV NO 000902.35-540007.1

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