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Doubles in session


Current system
15396+7959
STF 1989
Pi2 UMi


Nearby doubles
4' : 15386+7958
LDS1827

19' : 15365+7943
TDS9560

31' : 15309+8020
MFL 195

39' : 15292+8027
STF1972AB

47' : 15288+8037
HAU 23

56' : 15326+7907
KPP3292

64' : 15553+7912
MFL 182

65' : 15198+7923
MFL 197

67' : 15325+8103
STF1980

69' : 15355+8106
TDS9554

81' : 15434+8119
A 856AB

97' : 15223+7835
KPP 342

104' : 15446+8142
MFL 167

111' : 15586+7822
MFL 170

135' : 15479+7746
STF1997

154' : 15356+7726
LDS1825AB

159' : 15476+7722
MFL 186

164' : 15586+7726
UC 3095

168' : 15555+8242
SKF1312

168' : 15281+8245
MFL 166

169' : 15589+8242
WIS 299

173' : 15282+7710
MFL 147

175' : 15536+8251
TDS9679

181' : 15202+7708
LDS1819

181' : 15266+7701
LDS1821

194' : 15325+7646
HU 911



Selections
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Binocular doubles
Binary Systems
Triple Systems
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Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

15396+7959 STF 1989 (Pi2 UMi)

 
 
15h 39m 38.61s +79° 58' 59.6" P.A. 23.00 sep 0.7 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 2013 Obs 124
Pa first 24 Pa last 22.8 P.A. Now (θ) 20.4°
Sep first 0.7 Sep last 0.67 Sep. Now (ρ) 0.591"
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
Flamsteed 18 Ursae Minoris Flamsteed name 18 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 Notesn ReferenceHrt2008
Equinox2000 Last observation2004 Grade3(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


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


 
  


wds15396%2B7959a.png orbit plot
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
 
 
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
15396+7959 STF1989 2005 118 25 0.7 7.32 8.15 F2V NOD 153938.61+795859.6
15396+7959 STF1989 2008 120 24 0.7 7.32 8.15 F2V NOD 153938.61+795859.6
15396+7959 STF1989 2011 122 23 0.7 7.32 8.15 F2V NO 153938.61+795859.6
15396+7959 STF1989 2013 123 23 0.7 7.32 8.15 F2V 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
 
 

15396+7959 STF1989A mag 7.32 Sp F2V 15396+7959 STF1989B sep 0.6 P.A. 4.20 mag 8.15 virtual eyepiece
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Pass over with the mouse cursor to display the catalog designation.
Radius:
Components only
 
 
WDS 15396+7959 (Pi2 UMi) : ALADIN DSS IMAGE @ 15h 39m 38.61s +79° 58' 59.6"
 
 
 
 
WDS 15396+7959 STF 1989 (Pi2 UMi) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

15396+7959 STF1989 distance=0' 15386+7958 LDS1827 distance=4' 15365+7943 TDS9560 distance=19' 15309+8020 MFL 195 distance=31' 15292+8027 LAF 54BD distance=39' 15292+8027 LAF 54BE distance=39' 15292+8027 STF1972AB distance=39' 15292+8027 STF1972AC distance=39' 15288+8037 HAU 23 distance=47' 15326+7907 KPP3292 distance=56' 15553+7912 MFL 182 distance=64' 15198+7923 MFL 197 distance=65' 15325+8103 STF1980 distance=67' 15355+8106 TDS9554 distance=69' 15434+8119 A 856AB distance=81' 15434+8119 A 856AC distance=81' 15223+7835 KPP 342 distance=97' 15446+8142 MFL 167 distance=104' 15586+7822 MFL 170 distance=111' 15490+8209 MFL 185AC distance=132' 15479+7746 STF1997 distance=135' 15356+7726 LDS1825AB distance=154' 15356+7726 WIS 288AC distance=154' 15476+7722 MFL 186 distance=159' 15586+7726 UC 3095 distance=164' 15555+8242 SKF1312 distance=168' 15281+8245 MFL 166 distance=168' 15589+8242 WIS 299 distance=169' 15282+7710 MFL 147 distance=173' 15536+8251 TDS9679 distance=175' 15202+7708 LDS1819 distance=181' 15266+7701 LDS1821 distance=181' 15325+7646 HU 911 distance=194' 15364+8313 MLR 348 distance=195' 15434+7643 MFL 172 distance=197' 15476+8316 STF2002 distance=199' 15479+7636 MFL 183 distance=205' 15340+7632 LDS1824 distance=208' 15572+7629 STF2013 distance=217' 15587+7628 LDS1833 distance=217' 15487+8337 STF2034 distance=220' 15231+7620 MFL 148 distance=225' 15399+7606 MFL 171 distance=234' 15403+7601 HEI 787 distance=238' 15258+8430 MLR 347 distance=273' 15352+7520 STF1971 distance=280' 15454+7515 RAO 595 distance=285' 15449+7502 LDS1829 distance=299' 15229+8457 MLR 345 distance=300' grafico limitrofi
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 15396+7959 STF1989 23 0.7
Show 15386+7958 LDS1827 45 6.0 4
Show 15365+7943 TDS9560 17 0.6 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 47 10.2 67
Show 15355+8106 TDS9554 23 1.1 69
Show 15434+8119 A 856 AB 345 5.2 81
Show 15434+8119 A 856 AC 343 62.7 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 348 101 0.8 195
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 110 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 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=4.2°
sep=0.62"
 
 
15396+7959 A
 
 
Componente originario normalizzato AB Name Pi2 UMi Coord arcsec 2000 153938.61+795859.6 Mag 7.32
Spectral class F2V (yellow-white) PmRA -33.00 PmDE 39.0 SAO 2588
HIP 76695 Tycho2 4563-01084-1 HD 141652 GC 21163
BD BD+80 487 Bayer Pi 2 Ursae Minoris Bayer name Pi2 Flamsteed 18 Ursae Minoris
Flamsteed name 18 UMi
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
SAO
SAO 2588 DelFlag RA1950 PmRA1950 -0.0151
DE1950 PmDE1950 0.04 Vmag 6.9 SpType F2
Double code Source 70 CatNum 21163 DM BD+80 487
DMcomp BDsup HD 141652 M HD 0
GC 21163 RA1950rad 4.11161505 DE1950rad 1.39873032 PmRA2000 -0.0131
PmDE2000 0.042
Hipparcos
Catalog H HIP 76695 Proxy H RAhms 15 39 38.72
DEdms +79 58 59.2 Vmag 6.89 VarFlag R Vmag G
RAdeg 234.911 DEdeg 79.9831 AstroRef A Plx 8.5
CCDM 15396+7959 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 27 Rho 0.669 HD 141652 BD BD+80 487
CD CP Dm number +80 487 VIred 0.46
SpType F2 R SpType Coord arcsec 2000 153938.72+795859.2
Hipparcos 2
HIP 76695 Sn 15 So 3 Nc 2
RArad 4.0999761204 DErad 1.395968768 Plx 8.33 PmRA -32.92
PmDE 40.28 E RArad 0.57 E DErad 0.72 E Plx 0.61
E pmRA 0.6 E pmDE 0.92 Hpmag 6.9711 E Hpmag 0.0013
SHp 0.009 VA 0 BV 0.392 E BV 0.015
VI 0.46
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
 
 
Componente originario normalizzato AB Coord arcsec 2000 153938.63+795900.2 Mag 8.15 PmRA -33.00
PmDE 39.0 Calc delta mag 0.83 Calc coord yes
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