09123+1500 STT 569 AC (Pi1 Cnc)

Coord 2000	09123+1500		Discov num	STT 569		Comp	AC		Coord arcsec 2000	09 12 17.55 +14 59 45.7
Date first	1855		Date last	2015		Obs	16
Pa first	236		Pa last	213.7		P.A. Now (θ)	213.7°
Sep first	237.0		Sep last	204.72		Sep. Now (ρ)	204.72"
Mag pri	6.56		Mag sec	10.40		delta mag (ΔM)	3.84		Spectral class	G9V (yellow)
Pri motion ra	-524		Sec motion ra	-012
Pri motion dec	+246		Sec motion dec	+012
Notes	N L U (See Notes, Linear solution, Proper motion indicates non-physical)

rPM=0.972 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		98427	09 12 18 +14 59 46	FIN 347 Aa,Ab	2021	127	168	0.1	7.20	7.20	0.00	Y
Show		98427	09 12 18 +14 59 46	BUP 125 AB	2022	7	117	90.5	6.56	14.17	7.61
Show	Pi1 Cnc	98427	09 12 18 +14 59 46	STT 569 AC	2015	16	214	204.7	6.56	10.40	3.84		<===
Show		98427	09 12 18 +14 59 46	WIL 1 AE	2022	2	262	44.7	6.56	17.00	10.44
Show		98427	09 12 18 +14 59 46	HLA 10 AF	2018	3	290	4.6	4.70	12.60	7.90
Show			09 12 15 +14 59 40	BUG 16 Ea,Eb	2004	1	291	0.5	14.70	14.90	0.20

Septuple system
5 estimated visually detectable stars in this system

Name	Pi1 Cnc		Constellation	Cancer		SAO	98427		HIP	45170
Tycho2	0825-01543-1		HD	79096		HR	3650		GC	12693
GL	Gl 337A		BD	BD+15 2003		Bayer	Pi 1 Cancri		Bayer name	Pi1 Cnc
Flamsteed	81 Cancri		Flamsteed name	81 Cnc		Distance	20.36		Distance ly	66.41
Bayer greek	π1 Cnc

discov_num	notes	refcode
FIN 347	Aa,Ab: pi 1 Cnc = 81 Cnc.
	1981.358: This observation was incorrectly attributed to ADS 7158 by	Tok1982a
	Tokovinin (1982a) (noted in Tokovinin 1982b)	Tok1982b
	1983.9371, 1983.9372: Interferometric observations indicate that	Wor1983
	Finsen's 1965 orbit (see Worley & Heintz, 1983) must be revised.	Bnu1984
	1990.9166: Residuals (4.0 deg in theta, 0".007 in rho) to the orbit of
	Hartkopf (1989) are only fair, due to a combination of large zenith	Hrt1989
	distance and close angular separation at the time of this observation.
	A combined astrometric/spectroscopic orbital solution is given by
	Mason et al (1996).	Msn1996a
	Reversed Delta m and slightly larger parallax/smaller masses than in	Msn1996a
	the speckle-spectroscopic study by Mason et al.(1996).
	Pourbaix gives combined solution for this resolved SB2, yielding
	orbital parallaxes and component masses.	Pbx2000b
	Aa,Ab: Combined solution orbit. Mass_a = 0.983 +- 0.045 Msun,
	Mass_b = 0.903 +- 0.049 Msun, orbital parallax = 48.78 +- 2.36 mas.	Msn2012a
	Aa,Ab: Malkov et al. (2012) derive dynamical, photometric, and
	spectroscopic masses 1.80 +/- 0.25, 1.86, and 0.91 Msun, respectively.	Mlk2012
BUP 125	AB: Due to the high proper motion of the A component, a later
	observation of this pair by Soulie was incorrectly entered as a new	Sle1986a
	component, SLE 478AD.
STT 569	AC: Optical pair, based on study of relative motion of the
	components using the method of apparent motion parameters.	Kiy2008
WIL 1	AE: CPM pair. Using data from 2MASS, Wilson et al. (2001) derive a	Wil2001
	spectral type of L8V and mass 40-74Mjup for the companion (called
	Gl 337C in that paper). They also note that the C and D components for
	the system appear to be background objects without CPM to the AB pair.
BUG 16	Ea,Eb: Burgasser et al (2005) resolved the E component (called Gl 337C
	in the paper) into a 0.53" pair of near-equal magnitude. At a distance
	to the system of 20.5 +/- 0.4pc, the close pair has a physical
	separation of 10.9 +/- 0.6 au. Period of the pair is estimated at
	140-180y. Primary is L8; secondary is possibly early- or mid-T dwarf.	Bug2005

refcode	metd	author	reference
Bnu1984	S j	Bonneau, D., Carquillat, J.M., & Vidal, J.L.	1984A&AS...58..729B
Bnu1984		A&AS 58, 729, 1984
Bug2005	A j	Burgasser, A.J., Kirkpatrick, J.D., & Lowrance, P.J.	2005AJ....129.2849B
Bug2005		AJ 129, 2849, 2005
Hrt1989	orb -	Hartkopf, W.I., McAlister, H.A., & Franz, O.G.	1989AJ.....98.2275B
Hrt1989		AJ 98, 1014, 1989
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008
Mlk2012	not -	Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A.	2012A&A...546A..69M
Mlk2012		A&A 546, A69, 2012
Msn1996a	Sc j	Mason, B.D., McAlister, H.A., & Hartkopf, W.I.	1996AJ....112..276M
Msn1996a	+orb	AJ 112, 276, 1996
Msn2012a	orb -	Mason, B.D. & Hartkopf, W.I.	2012IAUDS.178....1M
Msn2012a		Inf. Circ. 178, 1, 2012
Pbx2000b	orb -	Pourbaix, D.	2000A&AS..145..215P
Pbx2000b		A&AS 145, 215, 2000
Sle1986a	Pa -	Soulie, G.	.
Sle1986a		Bull. Inf. Cent. Donnes Stell. #30, 91, 1986
Tok1982a	Ig j	Tokovinin, A.A.	1982SvAL....8...22T
Tok1982a		SvAL 8, 22, 1982 (Pisma Astron. Zhur. 8, 43, 1982)
Tok1982b	Ig j	Tokovinin, A.A.	1982SvAL....8...99T
Tok1982b		SvAL 8, 99, 1982 (Pisma Astron. Zhur. 8, 187, 1982)
Wil2001	E2 -	Wilson, J.C., Kirkpatrick, J.D., Gizis, J.E., Skrutskie, M.F., Monet, D.G., &	2001AJ....122.1989W
Wil2001		Houck, J.R.
Wil2001		AJ 122, 1989, 2001
Wil2001		(additional data on primary magnitudes and to derive position angles extracted
Wil2001		from ALADIN and 2MASS data)
Wor1983	-	Worley, C.E. & Heintz, W.D.	1983PUSNO..24g...1W
Wor1983		Pub. USNO 24, Pt. 7, 1983 (Fourth Orbit Catalog)

idgroup	discov	author
1	BUP	Burnham proper motion stars (see Burnham, Carnegie Inst. Wash. #168, 1913)
1	FIN	Finsen, W.S.
171	HLA	Hirsch, L.A., Ciardi, D.R., Howards, A.W., Marcy, G.W., Ruane, G., Gonzalez, E.,
171	HLA	Blunt, S., Crepp, J.R., Fulton, B.J., Isaacson, H., Kosiarek, M., Mawet, D.,
171	HLA	Sinukoff, E. & Weiss, L.
172	HLA	Hirsch, L.A., Rosenthal, L., Fulton, B.J., Howard, A.W., Ciardi, D.R., Marcy, G.W.,
172	HLA	Nielsen, E., Petigura, E.A., de Rosa, R.J., Isaacson, H., Weiss, L.M., Sinukoff, E.
174	STT	Struve, O.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
09123+1500	STT 569	AC	2007	11	217	204.4	6.56	10.40	G8V	NLD	091217.87+145943.6
09123+1500	STT 569	AC	2009	12	215	204.0	6.56	10.40	G8V	NLD	091217.87+145943.6
09123+1500	STT 569	AC	2015	16	214	204.7	6.56	10.40	G9V	NL U	091217.55+145945.7

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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

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