20320+2548 STF2695

 
 
20h 31m 58.19s +25 48' 18.1" P.A. 257.8 sep 0.44 mag 6.58,8.75 Sp Am+A2 dist. 87.03 pc (283.89 l.y.)
 
 
Coord 2000
20320+2548
Discov num
STF2695
Comp
Coord arcsec 2000
20 31 58.19 +25 48 18.1
Date first
1830
Date last
2016
Obs
141
Pa first
79
Pa last
259
P.A. Now (θ)
257.8°
Sep first
0.8
Sep last
0.4
Sep. Now (ρ)
0.44"
Mag pri
6.58
Mag sec
8.75
delta mag (ΔM)
2.17
Spectral class
Am+A2 (white/white)
Pri motion ra
+035
Sec motion ra
Pri motion dec
-016
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
259.4
Precise sep
0.381
Constellation
Vulpecula
SAO
88808
HIP
101300
Tycho2
2161-00330-1
Gaia DR2
91159294208
HD
195692
HR
7849
ADS
13964
BD
BD+25 4272
Distance
87.03
Distance ly
283.89
last precise pa
259.4
last precise sep
0.381
 
 
ORBITAL ELEMENTS
 
 
Period (P)269y Periastron (T)2016.37y Semi-major axis (a)0.773a
Eccentricity (e)0.431 Inclination (i)84.1° Longitude of periastron (ω)174.1°
Node (Ω)77.4° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2004
label rho theta
2000 0.247 246.8
2001 0.265 247.9
2002 0.282 248.9
2003 0.298 249.8
2004 0.314 250.6
2005 0.330 251.3
2006 0.344 251.9
2007 0.358 252.5
2008 0.371 253.1
2009 0.383 253.6
2010 0.394 254.1
2011 0.404 254.6
2012 0.413 255.0
2013 0.421 255.4
2014 0.427 255.9
2015 0.432 256.3
2016 0.436 256.6
2017 0.439 257.0
2018 0.441 257.4
2019 0.441 257.8
2020 0.440 258.2
2021 0.437 258.6
2022 0.434 259.0
2023 0.429 259.4
2024 0.423 259.8
2025 0.416 260.2
2026 0.408 260.6
2027 0.399 261.1
2028 0.389 261.6
2029 0.378 262.1
2030 0.366 262.6

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






wds20320%2B2548a.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
20320+2548 STF2695 2004 135 248 0.3 6.58 8.75 Am+A2 NOD 203158.19+254818.1
20320+2548 STF2695 2016 141 259 0.4 6.58 8.75 Am+A2 NO 203158.19+254818.1

If you need more information about this double, apply for a data request form to the WDS.