18154+5720 HDS2577

 
 
18h 15m 21.73s +57 20' 08.3" P.A. 328.9 sep 0.22 mag 8.93,9.56 Sp K0 dist. 64.35 pc (209.91 l.y.)
 
 
Coord 2000
18154+5720
Discov num
HDS2577
Comp
Coord arcsec 2000
18 15 21.73 +57 20 08.3
Date first
1991
Date last
2013
Obs
10
Pa first
139
Pa last
307
P.A. Now (θ)
328.9°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.22"
Mag pri
8.93
Mag sec
9.56
delta mag (ΔM)
0.63
Spectral class
K0 (yellow-orange)
Pri motion ra
+018
Sec motion ra
Pri motion dec
-065
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
306.5
Precise sep
0.249
Cdsa2 id
HDS 2577
Constellation
Draco
SAO
30845
HIP
89455
Tycho2
3912-01259-1
HD
168242
BD
BD+57 1856
Ra deg
18.25603611111111
De deg
57.335638888888894
Distance
64.35
Distance ly
209.91
last precise pa
306.5
last precise sep
0.249
 
 
ORBITAL ELEMENTS
 
 
Period (P)82y± 65 Periastron (T)1997.8y± 6.6 Semi-major axis (a)0.4a± 0.21
Eccentricity (e)0.36± 0.36 Inclination (i)62°± 14 Longitude of periastron (ω)313°± 51
Node (Ω)259°± 19 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2013
label rho theta
2000 0.242 246.5
2001 0.258 251.4
2002 0.272 255.8
2003 0.281 259.8
2004 0.287 263.6
2005 0.291 267.3
2006 0.291 270.9
2007 0.289 274.6
2008 0.284 278.3
2009 0.279 282.2
2010 0.272 286.3
2011 0.264 290.6
2012 0.256 295.1
2013 0.248 300.0
2014 0.240 305.1
2015 0.233 310.6
2016 0.227 316.5
2017 0.222 322.6
2018 0.219 328.9
2019 0.218 335.3
2020 0.219 341.8
2021 0.221 348.1
2022 0.226 354.3
2023 0.232 0.2
2024 0.240 5.7
2025 0.249 10.9
2026 0.259 15.7
2027 0.270 20.1
2028 0.282 24.1
2029 0.294 27.8
2030 0.307 31.2

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

grafico orbita





wds18154%2B5720a.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
18154+5720 HDS2577 2006 4 273 0.3 8.93 9.56 K0 D 181521.73+572008.3
18154+5720 HDS2577 2007 6 276 0.3 8.93 9.56 K0 D 181521.73+572008.3
18154+5720 HDS2577 2008 7 281 0.3 8.93 9.56 K0 D 181521.73+572008.3
18154+5720 HDS2577 2013 9 307 0.2 8.93 9.56 K0 181521.73+572008.3

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