19450+4508 STF2579AB (Del Cyg)

 
 
19h 44m 58.44s +45 07' 50.5" P.A. 214.80 sep 2.8 mag 2.89,6.27 Sp B9.5IV dist. 50.58 pc (164.99 l.y.)
 
 
Coord 2000
19450+4508
Discov num
STF2579
Comp
AB
Coord arcsec 2000
19 44 58.44 +45 07 50.5
Date first
1826
Date last
2017
Obs
487
Pa first
41
Pa last
215
P.A. Now (θ)
214.8°
Sep first
1.9
Sep last
2.7
Sep. Now (ρ)
2.77"
Mag pri
2.89
Mag sec
6.27
delta mag (ΔM)
3.38
Spectral class
B9.5IV (blue-white)
Pri motion ra
+051
Sec motion ra
Pri motion dec
+050
Sec motion dec
Notes
N O (See Notes, Orbital solution)
Visually invisible, K-band or other infrared star This double is physical.
 
 
19450+4508 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Del Cyg 48796 19450+4508 STF2579 AB 1826 2017 487 215 2.8 2.89 6.27 3.38 Y <===
Show 48796 19450+4508 STF2579 AC 1913 2017 8 67 62.5 2.89 12.00 9.11
Show 48796 19450+4508 DAL 37 AD 1998 2007 3 246 42.0 2.89 14.80 11.91
Show 48796 19450+4508 DAL 37 AF 1998 2007 3 66 147.5 2.89 12.80 9.91
Show 48796 19450+4508 DAL 37 DE 1998 2015 4 251 3.5 14.80 15.20 0.40
Show 48796 19450+4508 DAL 37 FG 2007 2015 2 312 3.1 13.00 13.80 0.80
Septuple system
7 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
215.2
Precise sep
2.68
Name
Del Cyg
Constellation
Cygnus
SAO
48796
HIP
97165
Tycho2
3557-02486-1
Gaia DR2
87999414656
HD
186882
HR
7528
GC
27347
ADS
12880
BD
BD+44 3234
Bayer
Delta Cygni
Bayer name
Del Cyg
Flamsteed
18 Cygni
Flamsteed name
18 Cyg
Distance
50.58
Distance ly
164.99
last precise pa
215.2
last precise sep
2.68
 
 
ORBITAL ELEMENTS
 
 
Period (P)657.1722y± 204.03 Periastron (T)1866.357y± 15.4645 Semi-major axis (a)2.68872a± 0.43688
Eccentricity (e)0.43962± 0.07552 Inclination (i)154.254°± 6.254 Longitude of periastron (ω)151.114°± 9.365
Node (Ω)138.595°± 31.21 Note Grade4(1=Definitive, 9=Indet.)
Equinox Last observation2015
label rho theta
2000 2.574 223.8
2001 2.584 223.4
2002 2.594 222.9
2003 2.604 222.4
2004 2.614 221.9
2005 2.623 221.5
2006 2.633 221.0
2007 2.643 220.5
2008 2.652 220.1
2009 2.662 219.6
2010 2.672 219.2
2011 2.682 218.7
2012 2.691 218.3
2013 2.701 217.8
2014 2.710 217.4
2015 2.720 217.0
2016 2.730 216.5
2017 2.739 216.1
2018 2.749 215.7
2019 2.758 215.3
2020 2.767 214.8
2021 2.777 214.4
2022 2.786 214.0
2023 2.796 213.6
2024 2.805 213.2
2025 2.814 212.8
2026 2.824 212.4
2027 2.833 212.0
2028 2.842 211.6
2029 2.851 211.2
2030 2.861 210.8

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






wds19450%2B4508c.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
19450+4508 STF2579 AB 2007 439 222 2.5 2.89 6.27 B9.5IV NOD 194458.44+450750.5
19450+4508 STF2579 AB 2008 445 220 2.8 2.89 6.27 B9.5IV NOD 194458.44+450750.5
19450+4508 STF2579 AB 2010 451 220 2.7 2.89 6.27 B9.5IV NOD 194458.44+450750.5
19450+4508 STF2579 AB 2011 454 216 2.5 2.89 6.27 B9.5IV NOD 194458.44+450750.5
19450+4508 STF2579 AB 2013 461 218 2.5 2.89 6.27 B9.5IV NOD 194458.44+450750.5
19450+4508 STF2579 AB 2014 469 218 2.6 2.89 6.27 B9.5IV NOD 194458.44+450750.5
19450+4508 STF2579 AB 2015 472 217 2.7 2.89 6.27 B9.5IV NO 194458.44+450750.5
19450+4508 STF2579 AB 2016 481 215 2.7 2.89 6.27 B9.5IV NO 194458.44+450750.5
19450+4508 STF2579 AB 2017 487 215 2.7 2.89 6.27 B9.5IV NO 194458.44+450750.5

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