15557-2645 I 977 (HD 142456)

 
 
15h 55m 41.93s -26° 44' 49.3" P.A. 264.00 sep 0.6 mag 7.99,8.48 Sp F7V dist. 75.53 pc (246.38 l.y.)
 
 
Coord 2000 15557-2645 Discov num I   977 Comp Coord arcsec 2000 15 55 41.93 -26 44 49.3
Date first 1910 Date last 2021 Obs 44
Pa first 20 Pa last 264.1 P.A. Now (θ) 264.1°
Sep first 0.4 Sep last 0.628 Sep. Now (ρ) 0.628"
Mag pri 7.99 Mag sec 8.48 delta mag (ΔM) 0.49 Spectral class F7V (yellow-white)
Pri motion ra -016 Sec motion ra
Pri motion dec -075 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 142456 Constellation Scorpius SAO 183933 HIP 78002
Tycho2 6787-00658-1 Gaia DR2 6235266089630115456 HD 142456 GC 21374
ADS 9836 CD CD-2611106 CP CP-26 5545 Distance 75.53
Distance ly 246.38
 
 
ORBITAL ELEMENTS SOLUTION #1
 
 
Period (P)274.5y Periastron (T)1968.88y Semi-major axis (a)0.754a
Eccentricity (e)0.364 Inclination (i)65.8° Longitude of periastron (ω)29.7°
Node (Ω)102.9° Notesn ReferenceSca2013d
Equinox2000 Last observation2010 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 232.2 0.307
2001 235.1 0.320
2002 237.8 0.334
2003 240.2 0.349
2004 242.4 0.363
2005 244.5 0.378
2006 246.4 0.393
2007 248.2 0.408
2008 249.9 0.423
2009 251.4 0.438
2010 252.8 0.453
2011 254.2 0.468
2012 255.4 0.483
2013 256.6 0.497
2014 257.7 0.512
2015 258.8 0.527
2016 259.8 0.541
2017 260.7 0.555
2018 261.6 0.569
2019 262.5 0.583
2020 263.3 0.596
2021 264.1 0.610
2022 264.9 0.623
2023 265.6 0.636
2024 266.3 0.649
2025 266.9 0.661
2026 267.6 0.673
2027 268.2 0.685
2028 268.8 0.697
2029 269.4 0.709
2030 269.9 0.720


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



 
 


wds15557-2645b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
ORBITAL ELEMENTS SOLUTION #2
 
 
Period (P)816.6y Periastron (T)1967.58y Semi-major axis (a)1.616a
Eccentricity (e)0.706 Inclination (i)69.7° Longitude of periastron (ω)20.4°
Node (Ω)107.5° Notesn ReferenceSca2013d
Equinox2000 Last observation2010 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 232.9 0.310
2001 235.7 0.325
2002 238.3 0.340
2003 240.6 0.356
2004 242.8 0.372
2005 244.7 0.388
2006 246.5 0.405
2007 248.2 0.422
2008 249.7 0.439
2009 251.1 0.456
2010 252.4 0.473
2011 253.6 0.490
2012 254.8 0.508
2013 255.8 0.525
2014 256.8 0.542
2015 257.8 0.559
2016 258.7 0.576
2017 259.5 0.594
2018 260.3 0.611
2019 261.0 0.628
2020 261.7 0.645
2021 262.4 0.662
2022 263.0 0.678
2023 263.6 0.695
2024 264.2 0.712
2025 264.7 0.728
2026 265.2 0.745
2027 265.7 0.761
2028 266.2 0.778
2029 266.7 0.794
2030 267.1 0.810


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



 
 


wds15557-2645c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic