05407-0157 STF 774 AB (Alnitak)

 
 
05h 40m 45.52s -01 56' 33.3" P.A. 166.00 sep 2.4 mag 1.88,3.70 Sp +B0III dist. 225.73 pc (736.33 l.y.)
 
 
Coord 2000 05407-0157 Discov num STF 774 Comp AB Coord arcsec 2000 05 40 45.52 -01 56 33.3
Date first 1822 Date last 2021 Obs 261
Pa first 152 Pa last 166.3 P.A. Now (θ) 166.3°
Sep first 2.3 Sep last 2.4 Sep. Now (ρ) 2.4"
Mag pri 1.88 Mag sec 3.70 delta mag (ΔM) 1.82 Spectral class +B0III
Pri motion ra +004 Sec motion ra +004
Pri motion dec +003 Sec motion dec +003
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
05407-0157 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 132444 05 40 46 -01 56 33 NOI 1 Aa,Ab 2021 25 244 0.0 2.00 4.20 2.20 Y
Show Alnitak 132444 05 40 46 -01 56 33 STF 774 AB 2021 261 166 2.4 1.88 3.70 1.82 Y <===
Show 132444 05 40 46 -01 56 33 STF 774 AC 2017 29 10 58.5 1.88 9.55 7.67
Show 05 40 46 -01 56 36 STF 774 BC 2002 3 8 59.8 3.70 9.55 5.85
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Alnitak Var name NSV2553 Ori Constellation Orion SAO 132444
HIP 26727 Tycho2 4771-01188-1 Gaia DR2 3216549528221605248 HD 37742
HR 1948 GC 7089 ADS 4263 BD BD-02 1338
Bayer Zeta Orionis Bayer name Zet Ori Flamsteed 50 Orionis Flamsteed name 50 Ori
Distance 225.73 Distance ly 736.33 Bayer greek ζ Ori
Other names ALNITAH
Meaning belt
 
 
ORBITAL ELEMENTS
 
 
Period (P)1508.6y Periastron (T)2070.6y Semi-major axis (a)2.728a
Eccentricity (e)0.07 Inclination (i)72° Longitude of periastron (ω)47.3°
Node (Ω)155.5° Notesn ReferenceHop1967
Equinox1900 Last observation1955 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 164.8 2.280
2001 164.9 2.275
2002 165.0 2.269
2003 165.1 2.264
2004 165.2 2.259
2005 165.3 2.253
2006 165.4 2.248
2007 165.5 2.242
2008 165.7 2.236
2009 165.8 2.231
2010 165.9 2.225
2011 166.0 2.219
2012 166.1 2.213
2013 166.2 2.208
2014 166.3 2.202
2015 166.4 2.196
2016 166.6 2.190
2017 166.7 2.184
2018 166.8 2.178
2019 166.9 2.172
2020 167.0 2.166
2021 167.1 2.160
2022 167.2 2.154
2023 167.4 2.147
2024 167.5 2.141
2025 167.6 2.135
2026 167.7 2.129
2027 167.8 2.122
2028 168.0 2.116
2029 168.1 2.110
2030 168.2 2.103


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



 
 


wds05407-0157d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic