18181-1215 DBK   1Aa,Ab

 
 
18h 18m 05.90s -12 14' 33.3" P.A. 336 mag 7.45, Sp O8Ia dist. 662.25 pc (2160.26 l.y.)
 
 
Coord 2000
18181-1215
Discov num
DBK   1
Comp
Aa,Ab
Coord arcsec 2000
18 18 05.90 -12 14 33.3
Date first
2008
Date last
2012
Obs
5
Pa first
107
Pa last
336
P.A. Now (θ)
336°
Sep first
0.0
Sep last
0.0
Sep. Now (ρ)
0"
Mag pri
7.45
Mag sec
delta mag (ΔM)
Spectral class
O8Ia (blue)
Pri motion ra
-000
Sec motion ra
Pri motion dec
-003
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
18181-1215 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 161292 18181-1215 DBK 1 Aa,Ab 2008 2012 5 336 0.0 7.45 Y <===
Show MY Ser 161292 18181-1215 TRN 27 AB 2001 2012 3 40 4.8 7.45 16.00 8.55
Show 161292 18181-1215 SS 7 AC 1953 2000 3 191 14.7 7.45 14.30 6.85
Show 161292 18181-1215 SS 7 AD 1906 2000 7 260 18.1 7.45 12.90 5.45
Show 161292 18181-1215 SS 7 AE 1906 2000 6 217 18.2 7.45 13.00 5.55
Show 161292 18181-1215 SS 7 AF 1906 2000 10 16 30.1 7.45 10.80 3.35
Show 161292 18181-1215 SS 7 AG 1953 2000 4 9 39.3 7.45 15.50 8.05
Show 161292 18181-1215 SS 7 AH 1907 2000 6 268 40.8 7.45 9.80 2.35
Show 161292 18181-1215 SS 7 AI 1953 2000 3 299 45.8 7.45 13.70 6.25
Show 161292 18181-1215 SS 7 AJ 1906 2000 4 258 45.3 7.45 11.42 3.97
Show 161292 18181-1215 SS 7 AK 1907 2000 4 262 48.6 7.45 10.51 3.06
Show 161292 18181-1215 SS 7 AL 1953 2000 4 348 51.7 7.45 14.50 7.05
Show 161292 18181-1215 SS 7 AM 1953 2000 4 254 64.4 7.45 15.30 7.85
Show 161292 18181-1215 SS 7 AN 1953 2000 4 279 71.0 7.45 15.10 7.65
Show 161292 18181-1215 SS 7 AO 1953 2000 4 305 72.0 7.45 15.90 8.45
Show 161292 18181-1215 SS 7 AP 1907 2000 6 286 72.5 7.45 10.40 2.95
Show 161292 18181-1215 SS 7 AQ 1907 2000 5 291 84.7 7.45 11.70 4.25
Show 161292 18181-1215 BRT2749 KJ 1906 2000 5 121 4.4 10.51 11.42 0.91
18-fold system
17 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
336
Precise sep
0.017
Var name
MY Ser
Constellation
Serpens
SAO
161292
HIP
89681
Tycho2
5685-04419-1
HD
167971
BD
BD-12 4980
Distance
662.25
Distance ly
2160.26
last precise pa
291.8
last precise sep
0.02
 
 
ORBITAL ELEMENTS
 
 
Period (P)7895d (21.62y)± 520 Periastron (T)54696d (2008.628y)± 50 Semi-major axis (a)18.6m± 1.1
Eccentricity (e)0.479± 0.031 Inclination (i)145.4°± 4.1 Longitude of periastron (ω)118.4°± 6.8
Node (Ω)213°± 11 Note Grade5(1=Definitive, 9=Indet.)
Equinox Last observation
label rho theta
2000 0.024 254.2
2001 0.024 247.1
2002 0.023 239.7
2003 0.022 231.7
2004 0.021 222.6
2005 0.018 211.6
2006 0.015 196.7
2007 0.011 173.0
2008 0.008 128.2
2009 0.009 69.4
2010 0.012 30.9
2011 0.014 6.2
2012 0.016 347.4
2013 0.017 332.2
2014 0.019 319.2
2015 0.020 307.9
2016 0.021 297.9
2017 0.022 288.9
2018 0.023 280.6
2019 0.024 272.9
2020 0.024 265.6
2021 0.024 258.5
2022 0.024 251.5
2023 0.024 244.3
2024 0.023 236.7
2025 0.022 228.4
2026 0.020 218.7
2027 0.017 206.5
2028 0.014 189.1
2029 0.010 159.1
2030 0.008 104.6

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

grafico orbita





wds18181-1215a.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
18181-1215 DBK 1 Aa,Ab 2011 4 354 0.0 7.45   M7 M6 N 181805.90-121433.3
18181-1215 DBK 1 Aa,Ab 2012 5 336 0.0 7.45   O8Ia N 181805.90-121433.3

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