15396+7959 STF 1989 (Pi2 UMi)

15^h 39^m 38.61^s +79° 58' 59.6" P.A. 21.00 sep 0.6 mag 7.32,8.15 Sp F2V dist. 120.05 pc (391.6 l.y.)

Coord 2000	15396+7959	Discov num	STF1989	Comp		Coord arcsec 2000	15 39 38.61 +79 58 59.6
Date first	1832	Date last	2023	Obs	125
Pa first	24	Pa last	20.9	P.A. Now (θ)	19.6° (calc)
Sep first	0.7	Sep last	0.62	Sep. Now (ρ)	0.579" (calc)
Mag pri	7.32	Mag sec	8.15	delta mag (ΔM)	0.83	Spectral class	F2V (yellow-white)
Pri motion ra	-033	Sec motion ra	-033
Pri motion dec	+039	Sec motion dec	+039
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	Pi2 UMi	Constellation	Ursa Minor	SAO	2588	HIP	76695
Tycho2	4563-01084-1	Gaia DR2	1708946939955140352	HD	141652	GC	21163
ADS	9769	BD	BD+80 487	Bayer	Pi 2 Ursae Minoris	Bayer name	Pi2 UMi
Distance	120.05	Distance ly	391.6	Bayer greek	π² UMi

ORBITAL ELEMENTS

Period (P)	171.62y	± 8.68	Periastron (T)	1904.15y	± 2.89	Semi-major axis (a)	0.464a	± 0.083
Eccentricity (e)	0.961	± 0.014	Inclination (i)	135.2°	± 10.5	Longitude of periastron (ω)	274°	± 22.4
Node (Ω)	123.4°	± 32.6	Notes	n		Reference	Hrt2008
Equinox	2000		Last observation	2004		Grade	3	(1=Definitive, 9=Indet.)

label	theta	rho
2000	25.6	0.643
2001	25.4	0.642
2002	25.2	0.641
2003	25.0	0.640
2004	24.8	0.638
2005	24.6	0.637
2006	24.3	0.635
2007	24.1	0.634
2008	23.9	0.632
2009	23.7	0.630
2010	23.5	0.628
2011	23.2	0.626
2012	23.0	0.624
2013	22.8	0.621
2014	22.5	0.619
2015	22.3	0.616
2016	22.1	0.613
2017	21.8	0.611
2018	21.6	0.608
2019	21.4	0.605
2020	21.1	0.601
2021	20.9	0.598
2022	20.6	0.595
2023	20.4	0.591
2024	20.1	0.587
2025	19.8	0.583
2026	19.6	0.579
2027	19.3	0.575
2028	19.1	0.571
2029	18.8	0.567
2030	18.5	0.562
2031	18.2	0.557
2032	17.9	0.553
2033	17.6	0.548
2034	17.3	0.543
2035	17.0	0.537
2036	16.7	0.532
2037	16.4	0.526
2038	16.1	0.520
2039	15.8	0.514
2040	15.4	0.508
2041	15.1	0.502
2042	14.7	0.495
2043	14.3	0.489
2044	14.0	0.482
2045	13.6	0.475
2046	13.2	0.467
2047	12.8	0.460
2048	12.3	0.452
2049	11.9	0.444
2050	11.4	0.436

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

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

WDS 15396+7959 STF 1989 (Pi2 UMi) : NOTES

discov_num	notes	refcode
STF1989	pi UMi.	Bu_1894
	Malkov et al. (2012) derive dynamical, photometric, and spectroscopic
	masses of 5.87 +/- 3.45, 3.45, and 1.35 Msun, respectively.	Mlk2012

REFERENCES

refcode	metd	author	reference
Bu_1894	Ma j	Burnham, S.W.	1894PLicO...2....3B
Bu_1894		Pub. Lick Obs. 2, 3, 1894 (includes most data from Bu_1893a)	1893AN....131..329B
Hrt2008	Su j	Hartkopf, W.I., Mason, B.D., & Rafferty, T.	2008AJ....135.1334H
Hrt2008	+orb	AJ 135, 1334, 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

DISCOVERER

discov	author
BU	Burnham, S.W. (BU 1 - 81)
HRT	Hartkopf, W.I., McAlister, H.A., Mason, B.D., ten Brummelaar, T.A., Roberts, J.C.,
HRT	Jr., Turner, N.H., & Wilson, J.W.
HRT	Hartkopf, W.I., W.I., Mason, B.D., Gies, D.R., ten Brummelaar, T.,
HRT	McAlister, H.A., Moffat, A.F.J., Shara, M.M., & Wallace, D.J.
HRT	Mason, B.D., Martin, C., Hartkopf, W.I., Barry, D.J., Germain, M.E.,
HRT	Douglass, G.G., Worley, C.E., ten Brummelaar, T.A., et al.
HRT	Hartkopf, W.I., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr., Turner, N.H.,
HRT	ten Brummelaar, T.A., Prieto, C.M., Ling, J.F., & Franz, O.G.
HRT	Mason, B.D., Henry, T.J., Soderblom. D.R., Hartkopf, W.I., Holdenreid, E.R.,
HRT	Rafferty, T.J., & Urban, S.E.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	dm_number	notes	coord_arcsec_2000
15396+7959	STF1989		2005	118	25	0.7	7.32	8.15	F2V	+80 487	NOD	153938.61+795859.6
15396+7959	STF1989		2008	120	24	0.7	7.32	8.15	F2V	+80 487	NOD	153938.61+795859.6
15396+7959	STF1989		2011	122	23	0.7	7.32	8.15	F2V	+80 487	NO	153938.61+795859.6
15396+7959	STF1989		2013	123	23	0.7	7.32	8.15	F2V	+80 487	NO	153938.61+795859.6
15396+7959	STF1989		2023	125	21	0.6	7.32	8.15	F2V	+80 487	NO	153938.61+795859.6

If you need more information about this double, apply for a data request form to the WDS.

WDS 15396+7959 STF 1989 (Pi2 UMi) : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 15396+7959 STF 1989 (Pi2 UMi) : MEASURES

No records found.

WDS 15396+7959 (Pi2 UMi) : VIRTUAL EYEPIECE

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WDS 15396+7959 (Pi2 UMi) : ALADIN DSS IMAGE @ 15^h 39^m 38.61^s +79° 58' 59.6"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 15396+7959 STF 1989 (Pi2 UMi) : NEIGHBORHOODS

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Pass over with the mouse cursor to display the catalog designation.

Show	name	coord_2000	discov#	comp	pa	sep	dist(')
Show		15396+7959	STF1989		21	0.6	0
Show		15386+7958	LDS1827		45	6.0	3
Show		15365+7943	TDS9560		17	1.0	19
Show		15309+8020	MFL 195		348	9.6	31
Show		15292+8027	LAF 54	BD	271	6.9	39
Show		15292+8027	LAF 54	BE	272	7.4	39
Show		15292+8027	STF1972	AB	79	31.6	39
Show		15292+8027	STF1972	AC	101	188.1	39
Show		15288+8037	HAU 23		65	34.9	47
Show		15326+7907	KPP3292		183	3.0	56
Show		15553+7912	MFL 182		84	14.6	64
Show		15198+7923	MFL 197		94	5.4	65
Show		15325+8103	STF1980		48	10.2	67
Show		15355+8106	TDS9554	AB	23	1.1	69
Show		15434+8119	A 856	AB	345	5.2	81
Show		15434+8119	A 856	AC	341	64.4	81
Show		15223+7835	KPP 342		323	3.7	97
Show		15446+8142	MFL 167		237	9.7	104
Show		15586+7822	MFL 170		357	7.5	111
Show		15490+8209	MFL 185	AC	336	15.5	132
Show		15479+7746	STF1997		339	18.3	135
Show		15356+7726	LDS1825	AB	280	182.4	154
Show		15356+7726	WIS 288	AC	318	999.9	154
Show		15476+7722	MFL 186		248	6.1	159
Show		15586+7726	UC 3095		207	29.5	164
Show		15555+8242	SKF1312		150	3.3	168
Show		15281+8245	MFL 166		115	7.6	168
Show		15589+8242	WIS 299		145	672.3	169
Show		15282+7710	MFL 147		147	59.7	173
Show		15536+8251	TDS9679		117	1.1	175
Show		15202+7708	LDS1819		226	11.8	181
Show		15266+7701	LDS1821		72	4.5	181
Show		15325+7646	HU 911		268	1.6	194
Show		15364+8313	MLR 348		117	0.6	195
Show		15434+7643	MFL 172		317	5.7	197
Show		15476+8316	STF2002		312	42.2	199
Show		15479+7636	MFL 183		259	31.9	205
Show		15340+7632	LDS1824		180	1.9	208
Show		15572+7629	STF2013		274	20.5	217
Show		15587+7628	LDS1833		117	3.6	217
Show		15487+8337	STF2034		109	1.1	220
Show		15231+7620	MFL 148		143	60.0	225
Show		15399+7606	MFL 171		132	4.1	234
Show		15403+7601	HEI 787		255	2.9	238
Show		15413+7600	CAC 24		210	0.4	240
Show		15258+8430	MLR 347		214	0.2	273
Show		15352+7520	STF1971		315	14.9	280
Show		15454+7515	RAO 595		143	0.9	285
Show		15449+7502	LDS1829		118	3.2	299
Show		15229+8457	MLR 345		229	0.8	300

WDS 15396+7959 : COMPONENTS

	A
B	pa=20.9° sep=0.62"

15396+7959 A

Name	Pi2 UMi		Coord arcsec 2000	153938.61+795859.6		Mag	7.32		Spectral class	F2V (yellow-white)
PmRA	-33.00		PmDE	39.0		Tycho2	4563-01084-1

Tycho2

Tycho2	4563-01084-1	Pflag		RAmdeg	234.91099984	DEmdeg	79.98325862
PmRA	-33.1	PmDE	38.8	E RAmdeg	4	E DEmdeg	4
E pmRA	1.1	E pmDE	1.2	EpRAm	1991.47	EpDEm	1991.46
Num	11	Q RAmdeg	0.8	Q DEmdeg	1.0	Q pmRA	0.9
Q pmDE	1.1	BTmag	7.397	E BTmag	0.015	VTmag	6.991
E VTmag	0.010	Prox	999	TYC	T	HIP	76695
CCDM	AB	RAdeg	234.91143972	DEdeg	79.98316861	EpRA 1990	1.68
EpDE 1990	1.66	E RAdeg	4.4	E DEdeg	4.3	Posflg	P
Corr	-0.1

CCDM

Ccdm	15396+7959	RComp		Comp	A	Note1
Note2		Discov num		DRAs	2.77	DDEs	0.0
R dRAs	10	Year		Theta		Rho
Obs	2	Vmag	7.3	Sp	F2	PmNote	*
PmRA	-31	PmDE	38	Dm number	+80 487	Cat1	BD
Name2	+80 353	Cat2	AGK2/3	HD	141652	M HD
ADS BDS	A 9769	M ADS BDS		N IDS		IDS	15451N8017A
HIC	76695

15396+7959 B

Coord arcsec 2000	153938.69+795900.2		Mag	8.15		PmRA	-33.00		PmDE	39.0
SAO	183673		DM	CD-2312450		Delta magnitude	0.83		Coordinate calculated	yes

SAO

SAO	183673	DelFlag		RA1950		PmRA1950	0.0012
DE1950		PmDE1950	-0.009	Vmag	8.7	SpType	M0
Double code		Source	25	CatNum	11075	DM	CD-2312450
DMcomp		BDsup		HD	139576	M HD	0
GC		RA1950rad	4.08735731	DE1950rad	-0.41123155	PmRA2000	0.0012
PmDE2000	-0.005

CCDM

Ccdm	15396+7959	RComp		Comp	B	Note1	*
Note2		Discov num	STF1989	DRAs		DDEs
R dRAs		Year	1832	Theta		Rho
Obs	99	Vmag	8.3	Sp		PmNote
PmRA		PmDE		Dm number		Cat1
Name2		Cat2		HD		M HD
ADS BDS	A 9769	M ADS BDS		N IDS		IDS	15451N8017B
HIC	76695