stampa
Login

Set your own preferrences to customize your experience with Stelle Doppie!
Create your account here!


Search



Actions
Advanced Search
Go to Simbad
New report
New measure
Login


Computed Lists
Populars
Latest Populars
Doubles in session


Current system
14450+2704
STF 1877 AB
Izar


Nearby doubles
29' : 14457+2638
CVR 158

55' : 14487+2728
CVR 757

62' : 14423+2615
LDS4490

62' : 14416+2747
COU 407

66' : 14491+2628
AG 346

70' : 14428+2807
CBL 466

76' : 14474+2813
KPP3285

78' : 14393+2648
A 571

98' : 14514+2750
KPP1961

99' : 14403+2549
COU 406

101' : 14401+2548
KPP2401

104' : 14500+2546
KPP1410

106' : 14431+2847
HJ 5487

107' : 14518+2759
GRV 894

114' : 14500+2837
HL 4AB

119' : 14376+2809
COU 405

127' : 14454+2911
HJ 2745

131' : 14444+2454
SLW1025

131' : 14367+2815
UC 2802

132' : 14401+2511
SLW1015

135' : 14550+2652
RAO 324

146' : 14341+2716
SLW1006

147' : 14342+2639
AZC 87

148' : 14485+2445
COU 304

150' : 14478+2440
KPP2507

150' : 14460+2934
CVR1597



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

14450+2704 STF 1877 AB (Izar)

 
 
14h 44m 59.14s +27° 04' 29.9" P.A. 347.00 sep 2.9 mag 2.58,4.81 Sp K0II-III dist. 62.11 pc (202.6 l.y.)
 
 
Coord 2000 14450+2704 Discov num STF1877 Comp AB Coord arcsec 2000 14 44 59.14 +27 04 29.9
Date first 1822 Date last 2020 Obs 475
Pa first 318 Pa last 346.6 P.A. Now (θ) 346.6°
Sep first 2.7 Sep last 2.88 Sep. Now (ρ) 2.88"
Mag pri 2.58 Mag sec 4.81 delta mag (ΔM) 2.23 Spectral class K0II-III (yellow-orange)
Pri motion ra -051 Sec motion ra
Pri motion dec +020 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
14450+2704 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Izar 83500 14 44 59 +27 04 30 STF 1877 AB 2020 475 347 2.9 2.58 4.81 2.23 <===
Show 83500 14 44 59 +27 04 30 STF 1877 AC 2020 7 254 174.1 2.58 12.58 10.00
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Izar Constellation Bootes SAO 83500 HIP 72105
Tycho2 2019-01251-1 Gaia DR2 1279798789901591168 HD 129988 HR 5506
GC 19856 ADS 9372 BD BD+27 2417 Bayer Epsilon Bootis
Bayer name Eps Boo Flamsteed 36 Bootis Flamsteed name 36 Boo Distance 62.11
Distance ly 202.6 Bayer greek ε Boo
Other names Mirac, Mirak
 
 
WDS 14450+2704 STF 1877 AB (Izar) : NOTES
 
 
discov_num notes refcode
STF1877 eps Boo = 36 Boo = Izar. B is a spectroscopic binary.
Scardia et al. say the quadrant is unambiguous for their 2004 theta Sca2005a
value of 162.9. This may have been a typographical error on their
part, as other observers find the secondary to be in the opposite
quadrant and a large magnitude difference.
AB: H 1 1. MEv2010
 
 
REFERENCES
 
 
refcode metd author reference
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Sca2005a S j Scardia, M., Prieur, J.-L., Sala, M., Ghigo, M., Koechlin, L., Aristidi, E., 2005MNRAS.357.1255S
Sca2005a +C & Mazzoleni, F.
Sca2005a +orb MNRAS 357, 1255, 2005
Sca2005a (theta corrections from Prieur, private communication)
 
 
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
14450+2704 STF1877 AB 2006 426 342 2.8 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2008 436 344 2.9 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2009 438 343 3.0 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2010 447 343 2.8 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2011 447 345 3.0 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2012 455 343 2.9 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2014 458 343 2.9 2.58 4.81 K0II-III N D 144459.25+270427.0
14450+2704 STF1877 AB 2015 461 343 2.9 2.58 4.81 K0II-III N 144459.25+270427.0
14450+2704 STF1877 AB 2017 464 345 2.9 2.58 4.81 K0II-III N 144459.14+270429.9
14450+2704 STF1877 AB 2018 465 344 2.9 2.58 4.81 K0II-III N 144459.14+270429.9
14450+2704 STF1877 AB 2020 474 346 2.7 2.58 4.81 K0II-III N 144459.14+270429.9

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

 
 
WDS 14450+2704 STF 1877 AB (Izar) : VISUAL OBSERVATIONS REPORTS
 
 
Show date username difficulty separation pa_estim interest notes
Show 23/05/27 Daedalus1 mean difficulty separated 347 do not miss it! The glare of the primary makes these two stars seem impossibly close. Beautiful.
Show 21/03/14 oldscope easy separated 355 do not miss it! A very fine double which is easy to locate and well worth looking at. The difference in magnitudes of the two stars is striking. It is easy to split if the conditions are reasonably good, even when it is still rising in the east. A very good double for the spring time and then summer. My PA estimate is rough but not too far off of the Stella Doppie value of 248.
Show 11/04/26 voyager75 mean difficulty separated   very interesting La famosa Izar del Boote, risolta a 182X, la secondaria si scorge a ridosso dell’anello di diffrazione. La primaria č di colore rosso/arancione, la secondaria sembra un verde chiaro

 
 
WDS 14450+2704 STF 1877 AB (Izar) : MEASURES
 
 
Records found: 1
Show date username difficulty sep sep_sigma pa pa_sigma delta_mag # notes
Show 23/05/27 Daedalus1 mean difficulty 3.02 0.02 347.00 0.00 2.35 12 Seeing: Pickering 5, poor
 
 
WDS 14450+2704 (Izar) : VIRTUAL EYEPIECE
 
 

14450+2704 STF1877A mag 2.58 Sp K0II 14450+2704 STF1877B sep 2.9 P.A. 348.00 mag 4.81 Sp III 14450+2704 STF1877C sep 156.5 P.A. 252.60 mag 12.58 Sp III virtual eyepiece
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
Radius:
Components only
 
 
WDS 14450+2704 (Izar) : ALADIN DSS IMAGE @ 14h 44m 59.14s +27° 04' 29.9"
 
 
 
 
WDS 14450+2704 STF 1877 AB (Izar) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

14450+2704 STF1877AB (Izar) distance=0' 14457+2638 CVR 158 distance=29' 14487+2728 CVR 757 distance=55' 14423+2615 LDS4490 distance=62' 14416+2747 COU 407 distance=62' 14491+2628 AG 346 distance=66' 14428+2807 CBL 466 distance=70' 14474+2813 KPP3285 distance=76' 14393+2648 A 571 distance=78' 14514+2750 KPP1961 distance=98' 14403+2549 COU 406 distance=99' 14401+2548 KPP2401 distance=101' 14500+2546 KPP1410 distance=104' 14431+2847 HJ 5487 distance=106' 14518+2759 GRV 894 distance=107' 14500+2837 HL 4AB distance=114' 14500+2837 HJ 5489AC distance=114' 14376+2809 COU 405 distance=119' 14454+2911 HJ 2745 distance=127' 14444+2454 SLW1025 distance=131' 14367+2815 UC 2802 distance=131' 14401+2511 SLW1015 distance=132' 14550+2652 RAO 324 distance=135' 14341+2716 SLW1006 distance=146' 14342+2639 AZC 87 distance=147' 14485+2445 COU 304 distance=148' 14478+2440 KPP2507 distance=150' 14460+2934 CVR1597 distance=150' 14543+2542 CVR 764 distance=150' 14354+2546 RAO 317 distance=151' 14552+2557 CVR 765 distance=153' 14449+2428 POU3172 distance=158' 14333+2725 A 688 distance=158' 14418+2432 TOK 297AB distance=159' 14418+2432 RAO 64BC distance=162' 14519+2921 WIS 272 distance=165' 14387+2931 UC 2809 distance=169' 14325+2645 LDS4476 distance=169' 14484+2422 STF1884 distance=169' 14323+2641 A 570AB distance=171' 14339+2835 GRV 889 distance=173' 14521+2439 KPP2020 distance=175' 14516+2936 A 1112 distance=175' 14349+2510 LDS4481 distance=179' 14536+2450 UC 2866AB distance=179' 14415+2957 LDS6298 distance=179' 14477+2406 HO 263 distance=183' 14314+2738 AZC 86 distance=185' 14489+2404 HJ 2747 distance=189' 14331+2526 HJ 2730 distance=189' 14311+2801 COU 404AB distance=194' 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 Izar 14450+2704 STF1877 AB 347 2.9
Show Izar 14450+2704 STF1877 AC 254 174.1
Show 14457+2638 CVR 158 308 69.4 29
Show 14487+2728 CVR 757 171 11.7 55
Show 14423+2615 LDS4490 317 13.9 62
Show 14416+2747 COU 407 114 0.4 62
Show 14491+2628 AG 346 335 9.6 66
Show 14428+2807 CBL 466 185 95.8 70
Show 14474+2813 KPP3285 271 5.6 76
Show 14393+2648 A 571 109 1.8 78
Show 14514+2750 KPP1961 35 15.5 98
Show 14403+2549 COU 406 17 3.0 99
Show 14401+2548 KPP2401 126 20.7 101
Show 14500+2546 KPP1410 340 10.6 104
Show 14431+2847 HJ 5487 239 19.6 106
Show 14518+2759 GRV 894 40 16.7 107
Show 14500+2837 HL 4 AB 209 61.0 114
Show 14500+2837 HJ 5489 AC 21 110.3 114
Show 14376+2809 COU 405 106 1.5 119
Show 14454+2911 HJ 2745 128 12.5 127
Show 14444+2454 SLW1025 262 10.4 131
Show 14367+2815 UC 2802 122 36.8 131
Show 14401+2511 SLW1015 281 111.2 132
Show 14550+2652 RAO 324 30 2.9 135
Show 14341+2716 SLW1006 18 162.7 146
Show 14342+2639 AZC 87 272 38.0 147
Show 14485+2445 COU 304 297 0.4 148
Show 14478+2440 KPP2507 222 22.5 150
Show 14460+2934 CVR1597 271 4.0 150
Show 14543+2542 CVR 764 300 13.5 150
Show 14354+2546 RAO 317 272 0.4 151
Show 14552+2557 CVR 765 22 14.7 153
Show 14449+2428 POU3172 176 3.9 158
Show 14333+2725 A 688 16 0.8 158
Show 14418+2432 TOK 297 AB 172 215.8 159
Show 14418+2432 RAO 64 BC 62 17.2 162
Show 14519+2921 WIS 272 249 999.9 165
Show 14387+2931 UC 2809 324 26.4 169
Show 14325+2645 LDS4476 49 2.3 169
Show 14484+2422 STF1884 55 2.3 169
Show 14323+2641 A 570 AB 234 0.2 171
Show 14339+2835 GRV 889 87 38.7 173
Show 14521+2439 KPP2020 57 16.1 175
Show 14516+2936 A 1112 18 6.3 175
Show 14349+2510 LDS4481 205 200.8 179
Show 14536+2450 UC 2866 AB 202 62.1 179
Show 14415+2957 LDS6298 103 6.0 179
Show 14477+2406 HO 263 136 0.2 183
Show 14314+2738 AZC 86 149 24.1 185
Show 14489+2404 HJ 2747 47 12.9 189
Show 14331+2526 HJ 2730 303 27.2 189

 
 
WDS 14450+2704 : COMPONENTS
 
 
  A B
B pa=348.0°
sep=2.86"
 
C pa=252.6°
sep=156.46"
pa=251.5°
sep=156.76"
 
 
14450+2704 A
 
 
Common name Izar Other names Mirac, Mirak Coord arcsec 2000 144459.14+270429.9 Mag 2.58
Spectral class K0II (yellow-orange) PmRA -51.00 PmDE 20.0 SAO 83500
HIP 72105 Tycho2 2019-01251-1 HD 129988 HR 5506
GC 19856 BD BD+27 2417 Bayer Epsilon Bootis Bayer name Eps Boo
Flamsteed 36 Bootis Flamsteed name 36 Boo
Tycho2
Tycho2 2019-01251-1 Pflag RAmdeg 221.24676327 DEmdeg 27.07420780
PmRA -42.2 PmDE 13.6 E RAmdeg 3 E DEmdeg 3
E pmRA 2.2 E pmDE 2.2 EpRAm 1991.61 EpDEm 1991.49
Num 4 Q RAmdeg 0.7 Q DEmdeg 1.3 Q pmRA 0.6
Q pmDE 1.1 BTmag 3.937 E BTmag 0.014 VTmag 2.578
E VTmag 0.009 Prox 29 TYC T HIP 72105
CCDM A RAdeg 221.24687333 DEdeg 27.07417556 EpRA 1990 1.63
EpDE 1990 1.51 E RAdeg 3.2 E DEdeg 3.3 Posflg D
Corr -0.1
SAO
SAO 83500 DelFlag RA1950 PmRA1950 -0.0038
DE1950 PmDE1950 0.018 Vmag 2.7 SpType K0
Double code Source 71 CatNum 1633 DM BD+27 2417
DMcomp BDsup HD 129988 M HD 9
GC 19856 RA1950rad 3.85195161 DE1950rad 0.4761969 PmRA2000 -0.0037
PmDE2000 0.021
Hipparcos
Catalog H HIP 72105 Proxy H RAhms 14 44 59.25
DEdms +27 04 27.0 Vmag 2.35 VarFlag R Vmag H
RAdeg 221.247 DEdeg 27.0742 AstroRef A Plx 15.55
CCDM 14449+2704 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 341 Rho 2.867 HD 129988 BD BD+27 2417
CD CP Dm number +27 2417 VIred 0.95
SpType A0 R SpType Coord arcsec 2000 144459.25+270427.0
Hipparcos 2
HIP 72105 Sn 15 So 3 Nc 2
RArad 3.8614864893 DErad 0.4725334744 Plx 16.1 PmRA -50.95
PmDE 21.07 E RArad 0.42 E DErad 0.37 E Plx 0.66
E pmRA 0.59 E pmDE 0.58 Hpmag 2.5167 E Hpmag 0.0005
SHp 0.004 VA 0 BV 0.966 E BV 0.004
VI 0.95
 
 
14450+2704 B
 
 
Coord arcsec 2000 144459.10+270432.7 Mag 4.81 Spectral class III Calc delta mag 2.23
Calc coord yes
 
 
14450+2704 C
 
 
Coord arcsec 2000 144447.96+270343.1 Mag 12.58 Spectral class III PmRA -6.00
PmDE -16.0 Calc delta mag 10 Calc coord yes