23079+7523 STT 489 AB (Pi Cep)

Coord 2000	23079+7523		Discov num	STT 489		Comp	AB		Coord arcsec 2000	23 07 53.84 +75 23 15.3
Date first	1843		Date last	2022		Obs	160
Pa first	330		Pa last	2.9		P.A. Now (θ)	2.9°
Sep first	1.8		Sep last	1.13		Sep. Now (ρ)	1.13"
Mag pri	4.61		Mag sec	6.80		delta mag (ΔM)	2.19		Spectral class	G0IV (yellow)
Pri motion ra	+006		Sec motion ra	+006
Pri motion dec	-031		Sec motion dec	-031
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	Pi Cep	10629	23 07 54 +75 23 15	STT 489 AB	2022	160	3	1.1	4.61	6.80	2.19	Y	<===
Show		10629	23 07 54 +75 23 15	HJ 1852 AC	2003	4	244	57.8	4.61	12.20	7.59

Triple system
3 estimated visually detectable stars in this system

Name	Pi Cep		Constellation	Cepheus		SAO	10629		HIP	114222
Tycho2	4601-03531-1		Gaia DR2	2232894437098037888		HD	218658		HR	8819
GC	32237		ADS	16538		BD	BD+74 1006		Bayer	Pi Cephei
Bayer name	Pi Cep		Flamsteed	33 Cephei		Flamsteed name	33 Cep		Distance	75.64
Distance ly	246.74		Bayer greek	π Cep

Period (P)	175.9639y	± 5.3142	Periastron (T)	1932.5594y	± 0.7697	Semi-major axis (a)	0.88724a	± 0.02843
Eccentricity (e)	0.66093	± 0.01996	Inclination (i)	41.812°	± 2.775	Longitude of periastron (ω)	108.22°	± 3.292
Node (Ω)	67.993°	± 4.234	Notes	n		Reference	Izm2019
Equinox			Last observation	2010		Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 346.7 1.061 2001 347.5 1.066 2002 348.2 1.071 2003 349.0 1.076 2004 349.8 1.081 2005 350.6 1.085 2006 351.3 1.090 2007 352.1 1.094 2008 352.8 1.099 2009 353.6 1.103 2010 354.3 1.107 2011 355.0 1.111 2012 355.8 1.114 2013 356.5 1.118 2014 357.2 1.121 2015 357.9 1.125 2016 358.6 1.128 2017 359.3 1.131 2018 0.1 1.134 2019 0.8 1.137 2020 1.4 1.139 2021 2.1 1.142 2022 2.8 1.144 2023 3.5 1.146 2024 4.2 1.148 2025 4.9 1.150 2026 5.6 1.152 2027 6.2 1.153 2028 6.9 1.154 2029 7.6 1.156 2030 8.3 1.157		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

Identifier	23079+7523 STT 489 A
coord_arcsec_2000	230753.84+752315.3

Period (P)	556.72d		Periastron (T)	39172.9d (1966.128y)		Semi-major axis (a)	11.7m	± 0.2
Eccentricity (e)	0.3		Inclination (i)	84.9°	± 0.8	Longitude of periastron (ω)	7.6°
Node (Ω)	58.6°	± 0.8	Notes	n		Reference	Ren2013
Equinox	2000		Last observation			Grade	9	(1=Definitive, 9=Indet.)

label theta rho 2000-01-01 230.4 0.006 2001-01-01 46.7 0.004 2002-01-01 239.9 0.015 2003-01-01 225.5 0.004 2004-01-01 28.0 0.002 2005-01-01 239.3 0.015 2006-01-01 208.2 0.002 2007-01-01 291.1 0.001 2008-01-01 238.7 0.015 2009-01-01 101.9 0.001 2010-01-01 257.1 0.003 2011-01-01 238.2 0.015 2012-01-01 71.3 0.003 2013-01-01 249.5 0.005 2014-01-01 237.6 0.015 2015-01-01 64.6 0.006 2016-01-01 246.2 0.007 2017-01-01 236.9 0.014 2018-01-01 61.4 0.007 2019-01-01 244.3 0.009 2020-01-01 236.1 0.013 2021-01-01 59.2 0.008 2022-01-01 243.0 0.011 2023-01-01 235.2 0.012 2024-01-01 57.2 0.008 2025-01-01 242.0 0.012 2026-01-01 234.1 0.010 2027-01-01 55.0 0.007 2028-01-01 241.1 0.013 2029-01-01 232.4 0.008 2030-01-01 51.6 0.006		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
STT 489	pi Cep = 33 Cep. Visual primary (G2 III) is 557d SB1 (#1425 in Batten	Bte1989
	n et al.). A spectroscopic orbit was published by Scarfe et al.	Scf1983
	AB: Additional notes may be found in Dembowski (1883) and	D__1883
	Muller (1950).	Mlr1950b
pi Cep	Aa,Ab: Astrometric orbit by Gatewood et al. (2001) found by combining	Gat2001b
	Hipparcos and Multichannel Astrometric Photometer data with the
	spectroscopic elements of Scarfe et al. (1983). The photographic	Scf1983
	semimajor axis estimated at 39.0 +/- 3.9 mas. Masses are determined
	for all three components of this triple.
	This object was misidentified as HR 8815 by McAlister (1978).	McA1978c
	Aa,Ab: Ren & Fu (2013) calculated an astrometric orbit, combining	Ren2013
	Hipparcos Intermediate Astrometric Data with spectroscopic elements by
	Scarfe et al. (1983).	Scf1983

refcode	metd	author	reference
Bte1989	-	Batten, A.H. & Fletcher, J.M.	1989PDAO...17....1B
Bte1989		Eighth Catalogue of the Orbital Elements of Spectroscopic Binary Systems; 89
Bte1989		Pub. DAO 17, 1, 19
D__1883	Ma -	Dembowski, H.	...................
D__1883		Misure micrometriche di Stelle Doppie e multiple...
D__1883		(Rome, Coi tipi del Salviucci), vol. I, 1883
Gat2001b	orb -	Gatewood, G.D., Han, I., de Jonge, J.K., Reiland, C.T., & Pourbaix, D.	2001ApJ...549.1145G
Gat2001b		ApJ 549, 1145, 2001
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.)
McA1978c	Sc j	McAlister, H.A.	1978PASP...90..288M
McA1978c		PASP 90, 288, 1978
Mlr1950b	Mc -	Muller, P.	1950JO.....33..105M
Mlr1950b		J. Obs. 33, 105, 1950
Ren2013	orb -	Ren, S. & Fu, Y.	2013AJ....145...81R
Ren2013		AJ 145, 81, 2013
Scf1983	orb -	Scarfe, C., Regan, J., Barlow, D., & Fekel, F.	1983MNRAS.203..103S
Scf1983		MNRAS 203, 103, 1983

idgroup	discov	author
1	HJ	Herschel, J.F.W.
50	STT	Struve, O.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
23079+7523	STT 489	AB	2005	153	350	1.1	4.61	6.80	G0IV	NOD	230753.84+752315.3
23079+7523	STT 489	AB	2006	154	351	1.1	4.61	6.80	G0IV	NOD	230753.84+752315.3
23079+7523	STT 489	AB	2009	156	353	1.1	4.61	6.80	G0IV	NOD	230753.84+752315.3
23079+7523	STT 489	AB	2010	157	355	1.1	4.61	6.80	G0IV	NOD	230753.84+752315.3
23079+7523	STT 489	AB	2016	158	4	1.1	4.61	6.80	G0IV	NO	230753.84+752315.3
23079+7523	STT 489	AB	2020	159	1	1.1	4.61	6.80	G0IV	NO	230753.84+752315.3
23079+7523	STT 489	AB	2022	160	3	1.1	4.61	6.80	G0IV	NO	230753.84+752315.3

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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 23079+7523 STT 489 AB 3 1.1 Show 23079+7523 HJ 1852 AC 244 57.8 Show 23095+7517 LDS2027 261 7.9 9 Show 23085+7543 LDS2026 13 2.8 20 Show 23027+7505 LDS2024 AB 209 3.7 27 Show 23027+7505 LDT 21 Aa,Ab 4 0.5 27 Show 22597+7539 OSO 187 308 15.2 35 Show 23153+7458 LDS2031 103 26.7 39 Show 22581+7511 TDS1195 179 1.1 40 Show 23105+7601 TDT3913 276 0.6 40 Show 23008+7453 HJ 3162 312 23.6 41 Show 22581+7505 LDS2018 223 7.0 42 Show 23128+7601 TDT3936 202 2.4 42 Show 22573+7458 LDS2017 1 6.1 49 Show 23133+7439 LDS2029 AB 273 149.9 50 Show 23133+7439 LDS2029 AC 52 39.3 50 Show 23010+7607 BU 851 152 1.6 51 Show 22561+7556 GAT 30 20 242.4 55 Show 23219+7547 LDS2037 322 39.3 58 Show 23014+7429 HJ 1844 62 17.5 60 Show 23051+7626 LOC 537 123 3.4 64 Show 23209+7436 SKF2746 333 32.0 69 Show 23026+7630 LDS2023 138 13.3 70 Show 22499+7510 HJ 1826 AB 354 21.5 70 Show 22499+7510 HJ 1826 AC 195 30.7 70 Show 23012+7629 WIS 373 260 999.9 71 Show 22542+7620 STF2963 2 1.9 76 Show 23126+7645 MLR 270 221 4.3 84 Show 22485+7608 LOC 523 248 4.1 85 Show 23125+7646 BVD 344 183 42.6 85 Show 22564+7643 TDT3800 229 0.9 90 Show 23275+7618 WFC 242 13 3.9 91 Show 23197+7355 HJ 1870 306 15.6 100 Show 22565+7654 LOC 522 AC 282 2.8 100 Show 22516+7653 UC 4836 200 64.0 108 Show 22482+7408 TDT3711 43 2.6 109 Show 23277+7406 STF3017 AB 19 1.2 110 Show 23277+7406 STF3017 AC 145 87.5 110 Show 23179+7341 KPP4312 71 4.0 110 Show 23030+7718 TDT3859 125 1.1 116 Show 23239+7704 STF3011 331 7.0 116 Show 23047+7719 LOC 539 303 13.0 117 Show 23174+7717 TDT3967 156 1.3 120 Show 23262+7336 LDS2041 AB 25 45.5 129 Show 22486+7335 TDT3718 171 0.5 133 Show 22496+7720 LOC 526 126 2.5 134 Show 23012+7310 LDS2021 63 84.4 136 Show 23132+7307 LDS2028 37 2.0 139 Show 23121+7747 LOC 541 142 4.6 145 Show 23058+7754 LOC 542 225 1.5 152 Show 23087+7755 TDT3901 Aa,Ab 73 0.5 152

	A	B
B	pa=0.7° sep=1.13"
C	pa=207.0° sep=28.75"	pa=206.1° sep=29.76"

Name	Pi Cep		Coord arcsec 2000	230753.84+752315.3		Mag	4.61		Spectral class	G0IV (yellow)
PmRA	6.00		PmDE	-31.0		SAO	10629		HIP	114222
Tycho2	4601-03531-1		HD	218658		HR	8819		GC	32237
BD	BD+74 1006		Bayer	Pi Cephei		Bayer name	Pi Cep		Flamsteed	33 Cephei
Flamsteed name	33 Cep

Tycho2	4601-03531-1		Pflag	P		RAmdeg	346.97433962		DEmdeg	75.38753356
PmRA	6.0		PmDE	-30.9		E RAmdeg	3		E DEmdeg	3
E pmRA	1.9		E pmDE	1.8		EpRAm	1991.69		EpDEm	1991.60
Num	5		Q RAmdeg	1.7		Q DEmdeg	1.3		Q pmRA	1.7
Q pmDE	1.3		BTmag	5.574		E BTmag	0.014		VTmag	4.609
E VTmag	0.009		Prox	11		TYC	T		HIP	114222
CCDM	A		RAdeg	346.97433139		DEdeg	75.38757639		EpRA 1990	1.73
EpDE 1990	1.64		E RAdeg	3.3		E DEdeg	3.3		Posflg	D
Corr	0.1

SAO	10629		DelFlag			RA1950			PmRA1950	0.0031
DE1950			PmDE1950	-0.023		Vmag	4.6		SpType	G5
Double code			Source	71		CatNum	874		DM	BD+74 1006
DMcomp			BDsup			HD	218658		M HD	0
GC	32237		RA1950rad	6.04887536		DE1950rad	1.31104071		PmRA2000	0.0033
PmDE2000	-0.03

Catalog	H		HIP	114222		Proxy	H		RAhms	23 07 53.84
DEdms	+75 23 15.3		Vmag	4.41		VarFlag			R Vmag	G
RAdeg	346.974		DEdeg	75.3876		AstroRef	A		Plx	14.83
CCDM	23078+7523		N CCDM	I		Nsys	1		Ncomp	2
MultFlag	C		Source			Qual	A		M HIP	AB
Theta	339		Rho	1.051		HD	218658		BD	BD+74 1006
CD			CP			Dm number	+74 1006		VIred	0.84
SpType	G2III		R SpType			Coord arcsec 2000	230753.84+752315.3

HIP	114222		Sn	17		So	3		Nc	2
RArad	6.0558443925		DErad	1.3157615108		Plx	13.22		PmRA	6.81
PmDE	-34.06		E RArad	0.86		E DErad	0.75		E Plx	0.95
E pmRA	1.05		E pmDE	0.88		Hpmag	4.5417		E Hpmag	0.0006
SHp	0.006		VA	0		BV	0.802		E BV	0.001
VI	0.84

Coord arcsec 2000	230753.84+752316.4		Mag	6.8		PmRA	6.00		PmDE	-31.0
Tycho2	4601-03531-2		Calc delta mag	2.19		Calc coord	yes

Tycho2	4601-03531-2		Pflag	P		RAmdeg	346.97433962		DEmdeg	75.38753356
PmRA	6.0		PmDE	-30.9		E RAmdeg	3		E DEmdeg	3
E pmRA	1.9		E pmDE	1.8		EpRAm	1991.69		EpDEm	1991.60
Num	5		Q RAmdeg	1.7		Q DEmdeg	1.3		Q pmRA	1.7
Q pmDE	1.3		BTmag	7.277		E BTmag	0.015		VTmag	6.798
E VTmag	0.010		Prox	11		TYC			HIP	114222
CCDM	B		RAdeg	346.97388500		DEdeg	75.38785306		EpRA 1990	1.73
EpDE 1990	1.65		E RAdeg	4.0		E DEdeg	4.1		Posflg	D
Corr	0.1

Coord arcsec 2000

230750.39+752249.7

Mag

12.2

Calc delta mag

7.59

Calc coord

yes