18003+2154 A  1374AB

 
 
18h 00m 17.93s +21 53' 47.5" P.A. 77.9 sep 0.54 mag 8.90,10.90 Sp G0
 
 
Coord 2000
18003+2154
Discov num
A  1374
Comp
AB
Coord arcsec 2000
18 00 17.93 +21 53 47.5
Date first
1906
Date last
2015
Obs
24
Pa first
10
Pa last
33
P.A. Now (θ)
77.9°
Sep first
0.7
Sep last
0.5
Sep. Now (ρ)
0.54"
Mag pri
8.90
Mag sec
10.90
delta mag (ΔM)
2
Spectral class
G0 (yellow)
Pri motion ra
-030
Sec motion ra
Pri motion dec
+014
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18003+2154 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 85624 18003+2154 WSI 106 Aa,Ab 2007 2015 3 309 0.1 9.40 9.90 0.50
Show 85624 18003+2154 A 1374 AB 1906 2015 24 78 0.5 8.90 10.90 2.00 Y <===
Show 85624 18003+2154 LBU 6 AB,C 1894 2001 7 299 76.8 8.61 11.33 2.72
Quintuple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
33.2
Precise sep
0.472
Constellation
Hercules
SAO
85624
Tycho2
1566-01708-1
HD
341480
ADS
10971
last precise pa
213.2
last precise sep
0.472
 
 
ORBITAL ELEMENTS SOLUTION #1
 
 
Period (P)139.53y Periastron (T)1995.81y Semi-major axis (a)0.504a
Eccentricity (e)0.806 Inclination (i)136.7° Longitude of periastron (ω)76°
Node (Ω)249° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2015
label rho theta
2000 0.198 73.4
2001 0.229 67.2
2002 0.256 62.4
2003 0.282 58.5
2004 0.305 55.2
2005 0.326 52.4
2006 0.346 49.9
2007 0.365 47.6
2008 0.382 45.6
2009 0.398 43.8
2010 0.414 42.0
2011 0.429 40.5
2012 0.443 39.0
2013 0.456 37.6
2014 0.468 36.2
2015 0.480 35.0
2016 0.492 33.8
2017 0.502 32.7
2018 0.513 31.6
2019 0.523 30.5
2020 0.532 29.5
2021 0.541 28.5
2022 0.550 27.6
2023 0.558 26.6
2024 0.566 25.7
2025 0.574 24.9
2026 0.581 24.0
2027 0.588 23.2
2028 0.594 22.4
2029 0.601 21.6
2030 0.607 20.8

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

grafico orbita





wds18003%2B2154a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
ORBITAL ELEMENTS SOLUTION #2
 
 
Period (P)497y± 222 Periastron (T)1978.1y± 3.1 Semi-major axis (a)0.98a± 0.24
Eccentricity (e)0.41± 0.18 Inclination (i)124.1°± 2 Longitude of periastron (ω)233°± 9
Node (Ω)166°± 5.2 Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.348 251.3
2001 0.352 248.4
2002 0.356 245.5
2003 0.360 242.7
2004 0.365 240.0
2005 0.371 237.4
2006 0.378 234.9
2007 0.385 232.4
2008 0.392 230.1
2009 0.400 227.8
2010 0.408 225.6
2011 0.416 223.5
2012 0.425 221.5
2013 0.434 219.6
2014 0.444 217.7
2015 0.453 216.0
2016 0.463 214.3
2017 0.473 212.7
2018 0.483 211.1
2019 0.494 209.6
2020 0.504 208.2
2021 0.514 206.8
2022 0.525 205.5
2023 0.536 204.2
2024 0.546 203.0
2025 0.557 201.8
2026 0.568 200.7
2027 0.578 199.6
2028 0.589 198.6
2029 0.600 197.6
2030 0.610 196.6

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

grafico orbita





wds18003%2B2154e.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
18003+2154 A 1374 AB 1991 20 270 0.2 8.90 10.90 G0 NO 180017.93+215347.5
18003+2154 A 1374 AB 2007 21 49 0.4 8.90 10.90 G0 NO 180017.93+215347.5
18003+2154 A 1374 AB 2015 24 33 0.5 8.90 10.90 G0 NO 180017.93+215347.5

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