21287+7034 LAB 6 Aa,Ab

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.

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

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

Other names

ALPHIRK

Meaning

Raw

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.
		Measures: green=micrometric, blue=interferometric, purple=photographic

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

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

idgroup	discov	author
1	STF	Struve, F.G.W.

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

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

FoV: 30" 1' 5' 15' 30' 1° 2° 4° 5° 8° Limit: 2 3 4 5 10 15 20 25 30 50 100 Primaries only
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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

	A	Ab
Ab	pa=199.0° sep=0.13"
B	pa=222.1° sep=6.36"	pa=222.6° sep=6.24"

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			E DEmdeg
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

Coord arcsec 2000

212839.57+703338.4

Mag

6.6

Calc delta mag

3.4

Calc coord

yes

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