23078+6338 HU 994 (HD 218537)

 
 
23h 07m 47.74s +63° 38' 00.5" P.A. 316.00 sep 0.2 mag 7.16,6.87 Sp B3V dist. 409.84 pc (1336.9 l.y.)
 
 
Coord 2000 23078+6338 Discov num HU  994 Comp Coord arcsec 2000 23 07 47.74 +63 38 00.5
Date first 1904 Date last 2011 Obs 60
Pa first 306 Pa last 315.6 P.A. Now (θ) 326°
Sep first 0.2 Sep last 0.211 Sep. Now (ρ) 0.13"
Mag pri 7.16 Mag sec 6.87 delta mag (ΔM) 0.29 Spectral class B3V (blue-white)
Pri motion ra +011 Sec motion ra
Pri motion dec +003 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 218537 Constellation Cepheus SAO 20439 HIP 114212
Tycho2 4282-00541-1 Gaia DR2 2207675110694474752 HD 218537 HR 8808
GC 32228 ADS 16530 BD BD+62 2171 Distance 409.84
Distance ly 1336.9
 
 
ORBITAL ELEMENTS
 
 
Period (P)237.7y Periastron (T)1967.4y Semi-major axis (a)0.281a
Eccentricity (e)0.289 Inclination (i)82.1° Longitude of periastron (ω)128.4°
Node (Ω)129.6° Notesn ReferenceDoc2013c
Equinox2000 Last observation2008 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 313.9 0.216
2001 314.3 0.214
2002 314.6 0.212
2003 315.0 0.209
2004 315.3 0.207
2005 315.7 0.204
2006 316.1 0.201
2007 316.5 0.198
2008 316.9 0.194
2009 317.3 0.191
2010 317.8 0.187
2011 318.2 0.184
2012 318.7 0.180
2013 319.2 0.176
2014 319.7 0.172
2015 320.3 0.167
2016 320.8 0.163
2017 321.5 0.159
2018 322.1 0.154
2019 322.8 0.149
2020 323.5 0.145
2021 324.3 0.140
2022 325.1 0.135
2023 326.0 0.130
2024 327.0 0.125
2025 328.0 0.121
2026 329.1 0.116
2027 330.4 0.111
2028 331.7 0.106
2029 333.2 0.101
2030 334.8 0.096


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


 
  


wds23078%2B6338a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic