21287+7034 LAB 6 Aa,Ab
21h 28m 39.58s +70° 33' 38.5" P.A. 226.00 sep 0.2 mag 3.20,6.60 Sp B2III dist. 210.08 pc (685.28 l.y.)
Coord 2000 |
21287+7034 |
|
Discov num |
LAB 6 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
21 28 39.58 +70 33 38.5 |
|
Date first |
1971 |
|
Date last |
2007 |
|
Obs |
85 |
|
Pa first |
47 |
|
Pa last |
226 |
|
P.A. Now (θ) |
46.3° |
|
Sep first |
0.3 |
|
Sep last |
0.172 |
|
Sep. Now (ρ) |
0.299" |
|
Mag pri |
3.20 |
|
Mag sec |
6.60 |
|
delta mag (ΔM) |
3.4 |
|
Spectral class |
B2III (blue-white) |
|
Pri motion ra |
+013 |
|
Sec motion ra |
|
|
Pri motion dec |
+008 |
|
Sec motion dec |
|
|
Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
21287+7034 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
|
10057 |
21 28 40 +70 33 38 |
LAB 6 Aa,Ab |
2007 |
85 |
226 |
0.2 |
3.20 |
6.60 |
3.40 |
Y |
<=== |
Show |
Alfirk |
10057 |
21 28 40 +70 33 38 |
STF 2806 AB |
2020 |
104 |
250 |
13.6 |
3.17 |
8.63 |
5.46 |
|
|
Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Common name |
Alfirk |
|
Constellation |
Cepheus |
|
SAO |
10057 |
|
HIP |
106032 |
|
Tycho2 |
4465-02643-1 |
|
Gaia DR2 |
2272185759992826624 |
|
HD |
205021 |
|
HR |
8238 |
|
GC |
30118 |
|
ADS |
15032 |
|
BD |
BD+69 1173 |
|
Bayer |
Beta Cephei |
|
Bayer name |
Bet Cep |
|
Flamsteed |
8 Cephei |
|
Flamsteed name |
8 Cep |
|
FK5 |
809 |
|
Distance |
210.08 |
|
Distance ly |
685.28 |
|
Bayer greek |
β Cep |
|
ORBITAL ELEMENTS
Period (P) | 83y | |
Periastron (T) | 1997.99y | |
Semi-major axis (a) | 0.195a | |
Eccentricity (e) | 0.732 | |
Inclination (i) | 87.3° | |
Longitude of periastron (ω) | 194.6° | |
Node (Ω) | 46.4° | |
Notes | n | |
Reference | Ana2006 | |
Equinox | 2000 | |
Last observation | 1998 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
243.9 |
0.011 |
2001 |
31.7 |
0.016 |
2002 |
40.1 |
0.040 |
2003 |
42.2 |
0.063 |
2004 |
43.2 |
0.085 |
2005 |
43.8 |
0.104 |
2006 |
44.2 |
0.123 |
2007 |
44.5 |
0.140 |
2008 |
44.7 |
0.156 |
2009 |
44.9 |
0.171 |
2010 |
45.1 |
0.185 |
2011 |
45.2 |
0.197 |
2012 |
45.4 |
0.210 |
2013 |
45.5 |
0.221 |
2014 |
45.6 |
0.231 |
2015 |
45.7 |
0.241 |
2016 |
45.8 |
0.251 |
2017 |
45.9 |
0.259 |
2018 |
45.9 |
0.267 |
2019 |
46.0 |
0.275 |
2020 |
46.1 |
0.281 |
2021 |
46.1 |
0.288 |
2022 |
46.2 |
0.294 |
2023 |
46.3 |
0.299 |
2024 |
46.3 |
0.304 |
2025 |
46.4 |
0.308 |
2026 |
46.4 |
0.312 |
2027 |
46.5 |
0.316 |
2028 |
46.5 |
0.319 |
2029 |
46.6 |
0.322 |
2030 |
46.6 |
0.324 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
|
WDS 21287+7034 LAB 6 Aa,Ab : NOTES
discov_num |
notes |
refcode |
LAB 6 |
Aa,Ab: bet Cep = 8 Cep = Alfirk. The third component was discovered |
|
|
recently by speckle interferometry. |
|
|
1971.48: Estimated delta m ~ 3 - 4. Attempts by Couteau (1973 private |
|
|
communication) to observe the companion visually were unsuccessful, |
|
|
supporting this large magnitude difference. Some anisotropic features |
|
|
in the Fourier transform may indicate other companions or |
|
|
circumstellar matter. |
Lab1974 |
|
1975.545, 1975.956: This is the primary of the system bet Cep and is |
|
|
believed to be a binary of period ~50 yr. There is also evidence of |
|
|
radial velocity variations. Labeyrie et al (1974) noted anisotropic |
Lab1974 |
|
features in the power spectrum which might indicate other companions, |
|
|
but such features were not observed in the power spectrum derived from |
|
|
these observations. |
BLM1978 |
|
Aa,Ab: Malkov et al. (2012) derive dynamical, photometric, and |
|
|
spectroscopic masses 9.98 +/- 3.28, 12.04, 12.02 Msun, respectively. |
Mlk2012 |
|
Uniform disk diameter 0.274 +/- 0.016 mas, |
|
|
Limb darkened diameter 0.280 +/- 0.016 mas, |
|
|
Teff = 29500 +/- 2500 K based on LDD. |
|
|
Radius is 7.22 +/- 0.42 \rsun. |
CIA2019a |
STF2806 |
AB: H 3 6. |
MEv2010 |
|
AB: Additional notes may be found in Dembowski (1883). |
D__1883 |
REFERENCES
refcode |
metd |
author |
reference |
Ana2006 |
orb - |
Andrade, M. |
2006IAUDS.158Q...3A |
Ana2006 |
|
Inf. Circ. 158, 3, 2006 |
|
BLM1978 |
S j |
Morgan, B.L., Beddoes, D.R., Scaddan, R.J. & Dainty, J.C. |
1978MNRAS.183..701M |
BLM1978 |
|
MNRAS 183, 701, 1978 |
|
CIA2019a |
not j |
Gordon, K.D., Gies, D.R., Schaefer, G.H., Huber, D. & Ireland, M. |
2019ApJ...873...91G |
CIA2019a |
|
ApJ 869, 37, 2018 |
|
D__1883 |
Ma - |
Dembowski, H. |
................... |
D__1883 |
|
Misure micrometriche di Stelle Doppie e multiple... |
|
D__1883 |
|
(Rome, Coi tipi del Salviucci), vol. I, 1883 |
|
Lab1974 |
S j |
Labeyrie, A., Bonneau, D., Stachnik, R.V., & Gezari, D.Y. |
1974ApJ...194L.147L |
Lab1974 |
+orb |
ApJ 194, L147, 1974 |
|
Lab1974 |
|
(data from Hale 5m, KPNO 3.8m, 2.1m. Aperture listed as mean value of 3.6m unless |
|
Lab1974 |
|
specifically given in paper) |
|
MEv2010 |
- |
MacEvoy, B. |
................... |
MEv2010 |
|
private communication, 2010 (see http://www.handprint.com/ASTRO/index.html) |
|
Mlk2012 |
not - |
Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. |
2012A&A...546A..69M |
Mlk2012 |
|
A&A 546, A69, 2012 |
|
DISCOVERER
idgroup |
discov |
author |
1 |
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 |
21287+7034 |
LAB 6 |
Aa,Ab |
2007 |
62 |
226 |
0.2 |
3.20 |
6.60 |
B2III |
N D |
212839.58+703338.5 |
If you need more information about this double, apply for a
data request form to the WDS.
WDS 21287+7034 LAB 6 Aa,Ab : VISUAL OBSERVATIONS REPORTS
No records found.
WDS 21287+7034 LAB 6 Aa,Ab : MEASURES
No records found.
WDS 21287+7034 : VIRTUAL EYEPIECE
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
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|
WDS 21287+7034 : ALADIN DSS IMAGE @ 21h 28m 39.58s +70° 33' 38.5"
WDS 21287+7034 LAB 6 Aa,Ab : 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 |
Alfirk |
21287+7034 |
LAB 6 |
Aa,Ab |
226 |
0.2 |
1 |
Show |
Alfirk |
21287+7034 |
STF2806 |
AB |
250 |
13.6 |
1 |
Show |
|
21275+7028 |
SHR 1 |
|
141 |
11.5 |
3 |
Show |
|
21274+7028 |
CSR 1 |
|
286 |
7.7 |
9 |
Show |
|
21289+7024 |
BKO 772 |
|
96 |
11.7 |
10 |
Show |
|
21319+7034 |
H 5 28 |
AB |
342 |
79.2 |
16 |
Show |
|
21319+7034 |
H 5 28 |
AC |
169 |
132.9 |
16 |
Show |
|
21309+7020 |
CSR 2 |
AB |
69 |
12.4 |
18 |
Show |
|
21309+7020 |
BKO 773 |
BC |
321 |
10.2 |
18 |
Show |
|
21322+7025 |
KPP2361 |
|
247 |
20.3 |
20 |
Show |
|
21327+7009 |
MLB 366 |
|
151 |
2.8 |
33 |
Show |
|
21331+7059 |
MLB 367 |
|
108 |
3.6 |
35 |
Show |
|
21363+7025 |
MLB 368 |
|
77 |
4.5 |
39 |
Show |
|
21277+7119 |
LDS1953 |
|
116 |
11.5 |
46 |
Show |
|
21362+7115 |
MLR 249 |
|
263 |
1.3 |
56 |
Show |
|
21201+7112 |
HJ 3027 |
|
128 |
34.2 |
57 |
Show |
|
21326+7134 |
HJ 3044 |
|
75 |
7.6 |
63 |
Show |
|
21209+6944 |
MLB 365 |
|
47 |
5.1 |
64 |
Show |
|
21399+6953 |
KPP1602 |
|
78 |
12.2 |
70 |
Show |
|
21148+7003 |
MLB 364 |
|
59 |
5.2 |
77 |
Show |
|
21195+6928 |
MLB 304 |
|
47 |
5.2 |
81 |
Show |
|
21115+7050 |
HDS3019 |
AB |
136 |
0.3 |
87 |
Show |
|
21233+7207 |
LSC 98 |
|
222 |
0.1 |
98 |
Show |
|
21267+7211 |
TDT2971 |
|
116 |
1.9 |
98 |
Show |
|
21343+7210 |
TDT3036 |
|
161 |
1.2 |
100 |
Show |
|
21114+7140 |
OSO 143 |
|
277 |
16.6 |
107 |
Show |
|
21257+7233 |
HJ 3035 |
AB |
127 |
23.2 |
121 |
Show |
|
21257+7233 |
HJ 3035 |
AC |
202 |
24.2 |
121 |
Show |
|
21391+6846 |
MLB 305 |
|
82 |
6.1 |
121 |
Show |
|
21480+6920 |
STF2835 |
|
272 |
1.9 |
125 |
Show |
|
21431+7225 |
NSN 747 |
|
59 |
1.0 |
131 |
Show |
|
21276+7247 |
LDS1954 |
|
4 |
6.0 |
134 |
Show |
|
21363+7247 |
HJ 3051 |
|
183 |
13.5 |
138 |
Show |
|
21320+7256 |
LDS1955 |
|
67 |
3.1 |
143 |
Show |
|
21403+6823 |
HU 968 |
|
147 |
1.3 |
144 |
Show |
|
21220+7257 |
TDT2926 |
|
74 |
0.6 |
148 |
Show |
|
21176+6818 |
YUN 1 |
AB |
92 |
9.0 |
148 |
Show |
|
21176+6818 |
CON 40 |
CD |
69 |
1.0 |
148 |
Show |
|
21157+6821 |
BVD 135 |
|
310 |
24.9 |
149 |
Show |
|
21344+7300 |
OSW 61 |
|
183 |
87.2 |
150 |
Show |
|
21399+6808 |
STF2823 |
|
254 |
1.5 |
158 |
Show |
|
21225+6751 |
TDT2933 |
|
157 |
0.6 |
167 |
Show |
|
21290+6744 |
TDT2986 |
|
223 |
0.5 |
170 |
Show |
|
21122+6803 |
KPP4227 |
AB |
298 |
1.9 |
174 |
Show |
|
21482+7303 |
MLB 426 |
|
116 |
2.4 |
176 |
Show |
|
21291+7330 |
SHN 251 |
|
-1 |
0.5 |
177 |
Show |
|
21270+7339 |
ZUC 15 |
|
167 |
1.9 |
186 |
Show |
|
21309+7342 |
MLB 425 |
|
338 |
2.0 |
188 |
Show |
|
21334+6728 |
WHC 23 |
|
201 |
15.6 |
188 |
Show |
|
21455+6745 |
HU 970 |
|
274 |
0.4 |
191 |
Show |
|
21342+7344 |
OSW 62 |
|
27 |
119.4 |
193 |
|
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WDS 21287+7034 : COMPONENTS
|
A |
Ab |
Ab |
pa=199.0°
sep=0.13"
| |
B |
pa=222.1°
sep=6.36"
| pa=222.6°
sep=6.24"
|
21287+7034 A
Common name |
Alfirk |
|
Meaning |
Raw |
|
Other names |
ALPHIRK |
|
Coord arcsec 2000 |
212839.58+703338.5 |
|
Mag |
3.17 |
|
Spectral class |
B1IV (blue-white) |
|
PmRA |
13.00 |
|
PmDE |
8.0 |
|
SAO |
10057 |
|
HIP |
106032 |
|
Tycho2 |
4465-02643-1 |
|
HD |
205021 |
|
HR |
8238 |
|
GC |
30118 |
|
BD |
BD+69 1173 |
|
Bayer |
Beta Cephei |
|
Bayer name |
Bet Cep |
|
Flamsteed |
8 Cephei |
|
Flamsteed name |
8 Cep |
|
FK5 |
809 |
|
Tycho2 |
4465-02643-1 |
|
Pflag |
X |
|
RAmdeg |
|
|
DEmdeg |
|
|
PmRA |
|
|
PmDE |
|
|
E RAmdeg |
|
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E DEmdeg |
|
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E pmRA |
|
|
E pmDE |
|
|
EpRAm |
|
|
EpDEm |
|
|
Num |
|
|
Q RAmdeg |
|
|
Q DEmdeg |
|
|
Q pmRA |
|
|
Q pmDE |
|
|
BTmag |
2.937 |
|
E BTmag |
0.014 |
|
VTmag |
3.173 |
|
E VTmag |
0.009 |
|
Prox |
134 |
|
TYC |
T |
|
HIP |
106032 |
|
CCDM |
|
|
RAdeg |
322.16490028 |
|
DEdeg |
70.56069500 |
|
EpRA 1990 |
1.75 |
|
EpDE 1990 |
1.76 |
|
E RAdeg |
3.2 |
|
E DEdeg |
3.3 |
|
Posflg |
|
|
Corr |
0.1 |
|
SAO |
10057 |
|
DelFlag |
|
|
RA1950 |
|
|
PmRA1950 |
0.002 |
|
DE1950 |
|
|
PmDE1950 |
0.013 |
|
Vmag |
3.3 |
|
SpType |
B1 |
|
Double code |
|
|
Source |
74 |
|
CatNum |
809 |
|
DM |
BD+69 1173 |
|
DMcomp |
|
|
BDsup |
|
|
HD |
205021 |
|
M HD |
0 |
|
GC |
30118 |
|
RA1950rad |
5.6200566 |
|
DE1950rad |
1.22768326 |
|
PmRA2000 |
0.0024 |
|
PmDE2000 |
0.008 |
|
Catalog |
H |
|
HIP |
106032 |
|
Proxy |
|
|
RAhms |
21 28 39.58 |
|
DEdms |
+70 33 38.5 |
|
Vmag |
3.23 |
|
VarFlag |
1 |
|
R Vmag |
H |
|
RAdeg |
322.165 |
|
DEdeg |
70.5607 |
|
AstroRef |
|
|
Plx |
5.48 |
|
CCDM |
21287+7034 |
|
N CCDM |
I |
|
Nsys |
1 |
|
Ncomp |
1 |
|
MultFlag |
|
|
Source |
|
|
Qual |
|
|
M HIP |
|
|
Theta |
|
|
Rho |
|
|
HD |
205021 |
|
BD |
BD+69 1173 |
|
CD |
|
|
CP |
|
|
Dm number |
+69 1173 |
|
VIred |
-0.25 |
|
SpType |
B2IIIv SB |
|
R SpType |
|
|
Coord arcsec 2000 |
212839.58+703338.5 |
|
HIP |
106032 |
|
Sn |
1 |
|
So |
0 |
|
Nc |
1 |
|
RArad |
5.6228381573 |
|
DErad |
1.2315164467 |
|
Plx |
4.76 |
|
PmRA |
12.54 |
|
PmDE |
8.39 |
|
E RArad |
0.3 |
|
E DErad |
0.26 |
|
E Plx |
0.3 |
|
E pmRA |
0.37 |
|
E pmDE |
0.27 |
|
Hpmag |
3.1438 |
|
E Hpmag |
0.0022 |
|
SHp |
0.013 |
|
VA |
1 |
|
BV |
-0.201 |
|
E BV |
0.003 |
|
VI |
-0.25 |
|
Ccdm |
21287+7034 |
|
RComp |
|
|
Comp |
A |
|
Note1 |
|
|
Note2 |
|
|
Discov num |
|
|
DRAs |
-2.39 |
|
DDEs |
-21.3 |
|
R dRAs |
10 |
|
Year |
|
|
Theta |
|
|
Rho |
|
|
Obs |
3 |
|
Vmag |
3.3 |
|
Sp |
B1 |
|
PmNote |
* |
|
PmRA |
10 |
|
PmDE |
13 |
|
Dm number |
+69 1173 |
|
Cat1 |
BD |
|
Name2 |
10057 |
|
Cat2 |
SAO |
|
HD |
205021 |
|
M HD |
|
|
ADS BDS |
A15032 |
|
M ADS BDS |
|
|
N IDS |
|
|
IDS |
21274N7007A |
|
HIC |
106032 |
|
21287+7034 Ab
Coord arcsec 2000 |
212839.57+703338.4 |
|
Mag |
6.6 |
|
Calc delta mag |
3.4 |
|
Calc coord |
yes |
|
21287+7034 B
Coord arcsec 2000 |
212838.73+703333.8 |
|
Mag |
8.63 |
|
PmRA |
10.00 |
|
PmDE |
6.0 |
|
Calc delta mag |
5.43 |
|
Calc coord |
yes |
|
Ccdm |
21287+7034 |
|
RComp |
|
|
Comp |
B |
|
Note1 |
|
|
Note2 |
|
|
Discov num |
STF2806 |
|
DRAs |
|
|
DDEs |
|
|
R dRAs |
|
|
Year |
1832 |
|
Theta |
250 |
|
Rho |
13.6 |
|
Obs |
30 |
|
Vmag |
8.0 |
|
Sp |
|
|
PmNote |
|
|
PmRA |
|
|
PmDE |
|
|
Dm number |
|
|
Cat1 |
|
|
Name2 |
|
|
Cat2 |
|
|
HD |
|
|
M HD |
|
|
ADS BDS |
A15032 |
|
M ADS BDS |
N |
|
N IDS |
|
|
IDS |
21274N7007B |
|
HIC |
|
|