20312+1116 DA    1BC

 
 
20h 31m 11.94s +11 15' 33.7" P.A. 189.3 sep 0.36 mag 7.90,8.00 Sp Am dist. 59.99 pc (195.69 l.y.)
 
 
Coord 2000
20312+1116
Discov num
DA    1
Comp
BC
Coord arcsec 2000
20 31 11.94 +11 15 33.7
Date first
1840
Date last
2006
Obs
97
Pa first
209
Pa last
179
P.A. Now (θ)
189.3°
Sep first
0.7
Sep last
0.2
Sep. Now (ρ)
0.36"
Mag pri
7.90
Mag sec
8.00
delta mag (ΔM)
0.1
Spectral class
Am (white)
Pri motion ra
-006
Sec motion ra
-006
Pri motion dec
-010
Sec motion dec
-010
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
20312+1116 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 106196 20312+1116 CHR 99 Aa,Ab 1983 2005 13 137 0.4 7.10
Show 20312+1116 STF2690 A,BC 1777 2018 158 256 17.7 7.12 7.39 0.27
Show 20312+1116 HJ 269 AD 1825 2016 17 108 23.0 7.12 12.10 4.98
Show 20312+1116 DA 1 BC 1840 2006 97 189 0.4 7.90 8.00 0.10 Y <===
Quintuple system
5 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
178.5
Precise sep
0.202
Constellation
Delphinus
SAO
106195
HIP
101233
Tycho2
1095-01695-1
Gaia DR2
88501616128
HD
195482
ADS
13946
Distance
59.99
Distance ly
195.69
last precise pa
178.5
last precise sep
0.202
 
 
ORBITAL ELEMENTS
 
 
Period (P)236.52y Periastron (T)1998.22y Semi-major axis (a)0.448a
Eccentricity (e)0.875 Inclination (i)68.6° Longitude of periastron (ω)237°
Node (Ω)180.3° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2006
label rho theta
2000 0.049 151.3
2001 0.081 164.8
2002 0.111 170.7
2003 0.136 174.3
2004 0.159 176.8
2005 0.180 178.7
2006 0.199 180.2
2007 0.216 181.4
2008 0.233 182.5
2009 0.248 183.4
2010 0.262 184.3
2011 0.275 185.0
2012 0.288 185.7
2013 0.300 186.3
2014 0.311 186.9
2015 0.322 187.4
2016 0.332 187.9
2017 0.342 188.4
2018 0.351 188.9
2019 0.360 189.3
2020 0.369 189.7
2021 0.377 190.1
2022 0.385 190.5
2023 0.393 190.8
2024 0.400 191.2
2025 0.407 191.5
2026 0.414 191.8
2027 0.420 192.1
2028 0.426 192.4
2029 0.433 192.7
2030 0.438 193.0

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






wds20312%2B1116a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20312+1116 DA 1 BC 2001 97 350 0.1 7.90 8.00 OD 203111.94+111533.7
20312+1116 DA 1 BC 2006 98 179 0.2 7.90 8.00 OD 203111.94+111533.7

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