13535-3540 HWE 28 AB (HD 120987)

 
 
13h 53m 32.75s -35° 39' 51.2" P.A. 317.00 sep 1.0 mag 6.27,6.38 Sp F4V dist. 52.27 pc (170.5 l.y.)
 
 
Coord 2000 13535-3540 Discov num HWE  28 Comp AB Coord arcsec 2000 13 53 32.75 -35 39 51.2
Date first 1876 Date last 2021 Obs 84
Pa first 270 Pa last 317.1 P.A. Now (θ) 317.4°
Sep first 0.8 Sep last 1.008 Sep. Now (ρ) 1.007"
Mag pri 6.27 Mag sec 6.38 delta mag (ΔM) 0.11 Spectral class F4V (yellow-white)
Pri motion ra -086 Sec motion ra -086
Pri motion dec -021 Sec motion dec -021
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
13535-3540 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 120987 204955 13 53 33 -35 39 51 HWE 28 AB 2021 84 317 1.0 6.27 6.38 0.11 Y <===
Show 204955 13 53 33 -35 39 51 BU 1108 AC 2016 14 150 28.2 6.27 12.30 6.03
Show 204955 13 53 33 -35 39 51 I 1618 AD 2016 5 130 37.9 6.27 14.80 8.53
Show 204955 13 53 33 -35 39 51 H 5 124 AE 2019 19 7 68.2 6.27 8.65 2.38
Quintuple system
5 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 120987 Constellation Centaurus SAO 204955 HIP 67819
Tycho2 7291-01975-1 Gaia DR2 6121891150715463296 HD 120987 HR 5222
GC 18761 CD CD-35 9090 CP CP-35 6008 Distance 52.27
Distance ly 170.5
 
 
ORBITAL ELEMENTS
 
 
Period (P)362.9985y± 15.368 Periastron (T)1958.5214y± 0.2243 Semi-major axis (a)1.4886a± 0.04375
Eccentricity (e)0.76736± 0.01353 Inclination (i)74.536°± 0.668 Longitude of periastron (ω)89.984°± 0.571
Node (Ω)113.094°± 0.644 Notesn ReferenceIzm2019
Equinox Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 308.9 0.988
2001 309.3 0.992
2002 309.7 0.995
2003 310.1 0.998
2004 310.4 1.000
2005 310.8 1.002
2006 311.2 1.004
2007 311.5 1.006
2008 311.9 1.007
2009 312.3 1.009
2010 312.7 1.010
2011 313.0 1.011
2012 313.4 1.011
2013 313.8 1.012
2014 314.1 1.012
2015 314.5 1.012
2016 314.9 1.012
2017 315.2 1.012
2018 315.6 1.011
2019 316.0 1.010
2020 316.3 1.010
2021 316.7 1.009
2022 317.1 1.008
2023 317.4 1.007
2024 317.8 1.005
2025 318.2 1.004
2026 318.6 1.003
2027 318.9 1.001
2028 319.3 0.999
2029 319.7 0.997
2030 320.1 0.995
2031 320.4 0.993
2032 320.8 0.991
2033 321.2 0.989
2034 321.6 0.987
2035 322.0 0.984
2036 322.4 0.982
2037 322.8 0.979
2038 323.2 0.977
2039 323.5 0.974
2040 323.9 0.971
2041 324.3 0.968
2042 324.7 0.966
2043 325.2 0.963
2044 325.6 0.960
2045 326.0 0.957
2046 326.4 0.953
2047 326.8 0.950
2048 327.2 0.947
2049 327.6 0.944
2050 328.1 0.941


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



 
 


wds13535-3540c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic