01559-2150 DON 27 (HD 11840)

 
 
01h 55m 56.74s -21° 49' 31.5" P.A. 294.00 sep 0.1 mag 8.79,10.60 Sp F3V dist. 145.99 pc (476.22 l.y.)
 
 
Coord 2000 01559-2150 Discov num DON  27 Comp Coord arcsec 2000 01 55 56.74 -21 49 31.5
Date first 1928 Date last 2023 Obs 14
Pa first 72 Pa last 293.9 P.A. Now (θ) 309.7°
Sep first 0.4 Sep last 0.12 Sep. Now (ρ) 0.114"
Mag pri 8.79 Mag sec 10.60 delta mag (ΔM) 1.81 Spectral class F3V (yellow-white)
Pri motion ra +008 Sec motion ra
Pri motion dec -028 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 11840 Constellation Cetus SAO 167406 HIP 9006
Tycho2 5858-00128-1 Gaia DR2 5135062662875209984 HD 11840 BD BD-22 321
CD CD-22 648 CP CP-22 194 Distance 145.99 Distance ly 476.22
 
 
ORBITAL ELEMENTS
 
 
Period (P)460y Periastron (T)2017.675y Semi-major axis (a)0.588a
Eccentricity (e)0.587 Inclination (i)117.6° Longitude of periastron (ω)77.1°
Node (Ω)43° Notes ReferenceTok2022g
Equinox2000 Last observation2021 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 33.7 0.280
2001 32.3 0.272
2002 30.9 0.263
2003 29.4 0.254
2004 27.8 0.245
2005 26.0 0.236
2006 24.1 0.227
2007 22.1 0.217
2008 19.8 0.207
2009 17.3 0.197
2010 14.6 0.188
2011 11.6 0.178
2012 8.2 0.168
2013 4.3 0.158
2014 0.0 0.149
2015 355.2 0.141
2016 349.8 0.133
2017 343.7 0.126
2018 337.1 0.121
2019 329.8 0.117
2020 322.2 0.114
2021 314.3 0.113
2022 306.5 0.115
2023 299.0 0.118
2024 291.9 0.122
2025 285.4 0.128
2026 279.6 0.136
2027 274.4 0.144
2028 269.8 0.153
2029 265.7 0.162
2030 262.0 0.172
2031 258.8 0.182
2032 255.9 0.193
2033 253.3 0.203
2034 250.9 0.213
2035 248.8 0.224
2036 246.9 0.234
2037 245.1 0.245
2038 243.5 0.255
2039 242.0 0.265
2040 240.6 0.275
2041 239.3 0.284
2042 238.1 0.294
2043 236.9 0.303
2044 235.9 0.312
2045 234.8 0.321
2046 233.9 0.330
2047 233.0 0.339
2048 232.1 0.347
2049 231.3 0.355
2050 230.5 0.363


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds01559-2150a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic