19450+4508 STF 2579 AB (Fawaris)
19h 44m 58.44s +45° 07' 50.5" P.A. 213.00 sep 2.7 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
2020
Obs
488
Pa first
41
Pa last
212.6
P.A. Now (θ)
212.6°
Sep first
1.9
Sep last
2.74
Sep. Now (ρ)
2.74"
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)
This double is physical.
19450+4508 SYSTEM COMPONENTS
Show
name
SAO
coord
wds_name
last
obs
pa
sep
mag1
mag2
d_mag
orb
current
Show
Fawaris
48796
19 44 58 +45 07 50
STF 2579 AB
2020
488
213
2.7
2.89
6.27
3.38
Y
<===
Show
48796
19 44 58 +45 07 50
STF 2579 AC
2017
8
67
62.5
2.89
12.00
9.11
Show
48796
19 44 58 +45 07 50
DAL 37 AD
2007
3
246
42.0
2.89
14.80
11.91
Show
48796
19 44 58 +45 07 50
DAL 37 AF
2007
3
66
147.5
2.89
12.80
9.91
Show
19 44 55 +45 07 35
DAL 37 DE
2015
4
251
3.5
14.80
15.20
0.40
Show
19 45 11 +45 08 51
DAL 37 FG
2016
3
312
3.1
13.00
13.80
0.80
Septuple system
7 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Common name
Fawaris
Var name
12380/1
Constellation
Cygnus
SAO
48796
HIP
97165
Tycho2
3557-02486-1
Gaia DR2
2079784487999414656
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
Bayer greek
δ Cyg
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
Notes n
Reference Izm2019
Equinox
Last observation 2015
Grade 4 (1=Definitive, 9=Indet.)
label
theta
rho
2000
223.8
2.574
2001
223.4
2.584
2002
222.9
2.594
2003
222.4
2.604
2004
221.9
2.614
2005
221.5
2.623
2006
221.0
2.633
2007
220.5
2.643
2008
220.1
2.652
2009
219.6
2.662
2010
219.2
2.672
2011
218.7
2.682
2012
218.3
2.691
2013
217.8
2.701
2014
217.4
2.710
2015
217.0
2.720
2016
216.5
2.730
2017
216.1
2.739
2018
215.7
2.749
2019
215.3
2.758
2020
214.8
2.767
2021
214.4
2.777
2022
214.0
2.786
2023
213.6
2.796
2024
213.2
2.805
2025
212.8
2.814
2026
212.4
2.824
2027
212.0
2.833
2028
211.6
2.842
2029
211.2
2.851
2030
210.8
2.861
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
WDS 19450+4508 STF 2579 AB (Fawaris) : NOTES
discov_num
notes
refcode
STF2579
del Cyg = 18 Cyg.
See Baize & Petit (1989) catalog of doubles with variable component.
Baz1989d
Uniform disk diameter 0.874 +/- 0.062 mas,
Limb darkened diameter 0.884 +/- 0.062 mas,
Teff = 12000 +/- 1400 K based on LDD.
Radius is 4.81 +/- 0.36 \rsun.
CIA2019a
AB: H 1 94.
MEv2010
REFERENCES
refcode
metd
author
reference
Baz1989d
-
Baize, P. & Petit, M.
1989A&AS...77..497B
Baz1989d
A&AS 77, 497, 1989
CIA2019a
not j
Gordon, K.D., Gies, D.R., Schaefer, G.H., Huber, D. & Ireland, M.
2019ApJ...873...91G
CIA2019a
ApJ 869, 37, 2018
Izm2019
orb u
Izmailov, I.S.
2019AstL...45...30I
Izm2019
Ast. Lett. 45, 30, 2019
Izm2019
(Orbital elements from weighted solutions used when available (Table 2),
Izm2019
unweighted elements (Table 1) used for remaining 29 systems.)
MEv2010
-
MacEvoy, B.
...................
MEv2010
private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
DISCOVERER
idgroup
discov
author
1
DAL
Daley, J.A.
51
STF
Struve, F.G.W.
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
19450+4508
STF2579
AB
2020
488
213
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.
WDS 19450+4508 STF 2579 AB (Fawaris) : VISUAL OBSERVATIONS REPORTS
Show
date
username
difficulty
separation
pa_estim
interest
notes
Show
20/06/15
oldscope
easy
separated
interesting but to observe in better conditions
Secondary outside of the primary ring, in the second ring. Separation = diam of the primary Airy disk. Diam of companion = 1/5 of Prim Airy disk. Beatiful, easy to find. Need good seeing.
WDS 19450+4508 STF 2579 AB (Fawaris) : MEASURES
No records found.
WDS 19450+4508 (Fawaris) : VIRTUAL EYEPIECE
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
WDS 19450+4508 (Fawaris) : ALADIN DSS IMAGE @ 19h 44m 58.44s +45° 07' 50.5"
DSS color
DSS blue
2MASS
AllWISE
GALEX
SDSS9
XMM
PanSTARRS
WDS 19450+4508 STF 2579 AB (Fawaris) : NEIGHBORHOODS
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
Show
name
coord_2000
discov#
comp
pa
sep
dist(')
Show
Fawaris
19450+4508
STF2579
AB
213
2.7
Show
Fawaris
19450+4508
STF2579
AC
67
62.5
Show
Fawaris
19450+4508
DAL 37
AD
246
42.0
Show
Fawaris
19450+4508
DAL 37
AF
66
147.5
Show
19450+4508
DAL 37
DE
251
3.5
1
Show
19450+4508
DAL 37
FG
312
3.1
3
Show
19457+4459
KOI5571
AB
52
1.9
12
Show
19457+4459
KOI5571
AC
270
3.0
12
Show
19457+4459
KOI5571
AD
315
3.4
12
Show
19447+4456
DA 13
AB
274
2.0
13
Show
19447+4456
DA 13
AC
288
155.3
13
Show
19446+4455
KOI3891
AB
242
1.0
14
Show
19446+4455
KOI3891
AC
137
2.0
14
Show
19446+4455
KOI3891
AD
188
1.4
14
Show
19446+4455
KOI3891
AE
98
4.7
14
Show
19446+4455
KOI3891
AF
78
6.1
14
Show
19461+4458
ES 83
210
7.2
16
Show
19442+4448
KOI4523
103
4.0
22
Show
19438+4450
KOI 320
208
3.9
23
Show
19470+4502
KOI1821
90
3.8
23
Show
19470+4500
DEA 190
67
8.7
24
Show
19467+4451
KOI6187
116
3.6
25
Show
19428+4519
DEA 478
286
55.2
26
Show
19438+4445
KOI3349
639
0.3
26
Show
19440+4443
KOI2656
311
3.5
27
Show
19456+4534
KOI 931
177
1.3
28
Show
19439+4443
KOI3946
63
4.1
28
Show
19474+4515
SMA 93
197
10.4
29
Show
19448+4440
KOI4263
156
3.8
29
Show
19450+4536
DEA 349
143
15.5
30
Show
19460+4438
KOI4610
137
2.6
33
Show
19423+4451
COU2690
127
0.6
33
Show
19477+4451
COU2691
211
1.1
34
Show
19440+4434
DEA 167
168
8.6
35
Show
19441+4434
KOI5527
AB
114
2.4
36
Show
19441+4434
KOI5527
AC
236
2.9
36
Show
19448+4433
KOI5528
62
2.7
36
Show
19414+4507
KOI3106
189
0.3
38
Show
19448+4430
KOI4584
221
3.0
38
Show
19454+4430
KOI4299
264
2.0
38
Show
19469+4435
KOI7049
AB
281
3.3
39
Show
19469+4435
KOI7049
AC
258
3.3
39
Show
19424+4437
KOI5545
285
0.1
42
Show
19416+4531
DEA 101
150
6.1
43
Show
19469+4430
KOI2992
238
6.0
44
Show
19478+4436
DEA 303
202
12.3
44
Show
19455+4423
KOI7028
AB
206
2.9
46
Show
19455+4423
KOI7028
AC
56
3.8
46
Show
19412+4531
KOI7139
233
3.2
47
Show
19447+4421
KOI5509
72
3.1
48
Show
19408+4532
BUP 195
153
91.3
50
WDS 19450+4508 : COMPONENTS
A
B
C
D
E
F
B
pa=204.3°
sep=2.53"
C
pa=59.1°
sep=47.37"
pa=57.4°
sep=49.47"
D
pa=247.0°
sep=40.70"
pa=249.5°
sep=38.88"
pa=242.7°
sep=87.85"
E
pa=246.8°
sep=43.31"
pa=249.1°
sep=41.48"
pa=242.8°
sep=90.47"
pa=243.3°
sep=2.62"
F
pa=65.7°
sep=147.82"
pa=65.0°
sep=149.73"
pa=68.8°
sep=100.91"
pa=66.0°
sep=188.51"
pa=65.9°
sep=191.13"
G
pa=64.7°
sep=147.21"
pa=64.1°
sep=149.14"
pa=67.3°
sep=100.17"
pa=65.2°
sep=187.88"
pa=65.2°
sep=190.49"
pa=321.4°
sep=2.59"
19450+4508 A
Common name
Fawaris
Coord arcsec 2000
194458.44+450750.5
Mag
2.89
Spectral class
B9.5IV (blue-white)
PmRA
51.00
PmDE
50.0
SAO
48796
HIP
97165
Tycho2
3557-02486-1
HD
186882
HR
7528
GC
27347
BD
BD+44 3234
Bayer
Delta Cygni
Bayer name
Del Cyg
Flamsteed
18 Cygni
Flamsteed name
18 Cyg
Tycho2
3557-02486-1
Pflag
X
RAmdeg
DEmdeg
PmRA
PmDE
E RAmdeg
E DEmdeg
E pmRA
E pmDE
EpRAm
EpDEm
Num
Q RAmdeg
Q DEmdeg
Q pmRA
Q pmDE
BTmag
2.866
E BTmag
0.014
VTmag
2.893
E VTmag
0.009
Prox
25
TYC
T
HIP
97165
CCDM
A
RAdeg
296.24351972
DEdeg
45.13069611
EpRA 1990
1.70
EpDE 1990
1.64
E RAdeg
3.5
E DEdeg
3.5
Posflg
Corr
0.6
SAO
48796
DelFlag
RA1950
PmRA1950
0.0046
DE1950
PmDE1950
0.049
Vmag
3
SpType
A0
Double code
Source
71
CatNum
742
DM
BD+44 3234
DMcomp
BDsup
HD
186882
M HD
0
GC
27347
RA1950rad
5.16360542
DE1950rad
0.78553504
PmRA2000
0.005
PmDE2000
0.048
Catalog
H
HIP
97165
Proxy
H
RAhms
19 44 58.44
DEdms
+45 07 50.5
Vmag
2.86
VarFlag
R Vmag
G
RAdeg
296.243
DEdeg
45.1307
AstroRef
A
Plx
19.07
CCDM
19450+4508
N CCDM
I
Nsys
1
Ncomp
2
MultFlag
C
Source
Qual
A
M HIP
AB
Theta
228
Rho
2.52
HD
186882
BD
BD+44 3234
CD
CP
Dm number
+44 3234
VIred
-0.02
SpType
B9.5III
R SpType
Coord arcsec 2000
194458.44+450750.5
HIP
97165
Sn
15
So
3
Nc
2
RArad
5.1704246155
DErad
0.7876791647
Plx
19.77
PmRA
44.07
PmDE
48.66
E RArad
0.41
E DErad
0.41
E Plx
0.48
E pmRA
0.46
E pmDE
0.49
Hpmag
2.8683
E Hpmag
0.0002
SHp
0.004
VA
0
BV
-0.002
E BV
0.003
VI
-0.02
Ccdm
19450+4508
RComp
Comp
A
Note1
Note2
Discov num
DRAs
-1.56
DDEs
-9.7
R dRAs
10
Year
Theta
Rho
Obs
3
Vmag
3.0
Sp
A0
PmNote
*
PmRA
44
PmDE
44
Dm number
+44 3234
Cat1
BD
Name2
+45 1581
Cat2
AGK2/3
HD
186882
M HD
ADS BDS
A12880
M ADS BDS
N IDS
IDS
19418N4453A
HIC
97165
19450+4508 B
Coord arcsec 2000
194458.34+450748.2
Mag
6.27
Calc delta mag
3.38
Calc coord
yes
Ccdm
19450+4508
RComp
Comp
B
Note1
*
Note2
Discov num
STF2579
DRAs
DDEs
R dRAs
Year
1830
Theta
Rho
Obs
99
Vmag
7.9
Sp
PmNote
PmRA
PmDE
Dm number
Cat1
Name2
Cat2
HD
M HD
ADS BDS
A12880
M ADS BDS
N IDS
IDS
19418N4453B
HIC
97165
19450+4508 C
Coord arcsec 2000
194502.28+450814.8
Mag
12
Calc delta mag
9.11
Calc coord
yes
Ccdm
19450+4508
RComp
Comp
C
Note1
Note2
Discov num
STF2579
DRAs
DDEs
R dRAs
Year
1960
Theta
066
Rho
65.7
Obs
2
Vmag
12.0
Sp
PmNote
PmRA
PmDE
Dm number
Cat1
Name2
Cat2
HD
M HD
ADS BDS
A12880
M ADS BDS
N IDS
IDS
19418N4453C
HIC
19450+4508 D
Coord arcsec 2000
194454.90+450734.6
Coord calc
194454.90+450734.6
Mag
14.8
PmRA
-7.00
PmDE
-4.0
Calc delta mag
11.91
19450+4508 E
Coord arcsec 2000
194454.68+450733.4
Mag
15.2
Calc delta mag
12.31
Calc coord
yes
19450+4508 F
Coord arcsec 2000
194511.17+450851.4
Coord calc
194511.17+450851.4
Mag
13
PmRA
-1.00
PmDE
-9.0
Calc delta mag
10.11
19450+4508 G
Coord arcsec 2000
194511.02+450853.4
Mag
13.8
Calc delta mag
10.91
Calc coord
yes