19070+1104 HEI 568 (18 Aql)

 
 
19H 06M 58.60S +11 04' 16.7" P.A. 251.6 SEP 0.29 MAG 5.44,6.39 SP B8III DIST. 214.13 PC (698.49 L.Y.)
 
 
Coord 2000
19070+1104
Discov num
HEI 568
Comp
Coord arcsec 2000
19 06 58.60 +11 04 16.7
Date first
1987
Date last
2015
Obs
39
Pa first
320
Pa last
257
P.A. Now (θ)
251.6°
Sep first
0.3
Sep last
0.3
Sep. Now (ρ)
0.29"
Mag pri
5.44
Mag sec
6.39
delta mag (ΔM)
0.95
Spectral class
B8III (blue-white)
Pri motion ra
+005
Sec motion ra
Pri motion dec
-026
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
18 Aql
Var name
Y Aql
Constellation
Aquila
SAO
104488
HIP
93867
HD
178125
HR
7248
GC
26315
Flamsteed
18 Aquilae
Flamsteed name
18 Aql
Distance
214.13
Distance ly
698.49
last precise pa
257.4
last precise sep
0.29
 
 
ORBITAL ELEMENTS
 
 
Period (P)205.16y Periastron (T)2014.6y Semi-major axis (a)0.399a
Eccentricity (e)0.23 Inclination (i)134.3° Longitude of periastron (ω)201.4°
Node (Ω)94.5° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.313 288.3
2001 0.313 286.3
2002 0.313 284.4
2003 0.313 282.5
2004 0.313 280.5
2005 0.313 278.6
2006 0.312 276.7
2007 0.311 274.7
2008 0.310 272.7
2009 0.309 270.8
2010 0.307 268.8
2011 0.305 266.7
2012 0.303 264.7
2013 0.301 262.6
2014 0.298 260.5
2015 0.295 258.3
2016 0.292 256.1
2017 0.289 253.9
2018 0.286 251.6
2019 0.283 249.2
2020 0.279 246.8
2021 0.276 244.4
2022 0.272 241.9
2023 0.269 239.3
2024 0.265 236.6
2025 0.262 233.9
2026 0.259 231.1
2027 0.255 228.2
2028 0.252 225.2
2029 0.250 222.2
2030 0.247 219.1

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic