18002+8000 STF 2308 AB (41 Dra)

 
 
18h 00m 09.07s +80° 00' 13.7" P.A. 232.00 sep 18.9 mag 5.70,6.00 Sp F7V+F7V dist. 63.53 pc (207.23 l.y.)
 
 
Coord 2000 18002+8000 Discov num STF2308 Comp AB Coord arcsec 2000 18 00 09.07 +80 00 13.7
Date first 1782 Date last 2022 Obs 184
Pa first 235 Pa last 232 P.A. Now (θ) 232°
Sep first 20.7 Sep last 18.9 Sep. Now (ρ) 18.9"
Mag pri 5.70 Mag sec 6.00 delta mag (ΔM) 0.3 Spectral class F7V+F7V (yellow-white/yellow-white)
Pri motion ra +047 Sec motion ra +055
Pri motion dec +124 Sec motion dec +131
Notes N O V (See Notes, Orbital solution, Proper motion indicates physical)
rPM=0.075 (< 0.3, Physical double)
This double is physical.
 
 
18002+8000 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 8996 18 00 09 +80 00 14 BAG 6 Aa,Ab 2012 31 316 0.1 6.22 6.69 0.47 Y
Show 41 Dra 8996 18 00 09 +80 00 14 STF 2308 AB 2022 184 232 18.9 5.70 6.00 0.30 Y <===
Show 8996 18 00 09 +80 00 14 STF 2308 AC 2017 17 129 225.3 5.70 8.34 2.64
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 41 Dra Var name NSV10205 Dra Constellation Draco SAO 8996
HIP 88136 Tycho2 4578-01433-1 Gaia DR2 2294405824838599808 HD 166866
HR 6810 GC 24669 ADS 11061 BD BD+79 571
Flamsteed 41 Draconis Flamsteed name 41 Dra Distance 63.53 Distance ly 207.23
 
 
ORBITAL ELEMENTS
 
 
Period (P)18000y Periastron (T)3381y Semi-major axis (a)24.74a
Eccentricity (e)0.84 Inclination (i)162° Longitude of periastron (ω)138°
Node (Ω)233° Notesn ReferenceKis1996
Equinox2000 Last observation Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 232.2 18.959
2001 232.2 18.950
2002 232.2 18.941
2003 232.1 18.932
2004 232.1 18.923
2005 232.1 18.913
2006 232.1 18.904
2007 232.1 18.895
2008 232.1 18.886
2009 232.0 18.877
2010 232.0 18.868
2011 232.0 18.859
2012 232.0 18.849
2013 232.0 18.840
2014 231.9 18.831
2015 231.9 18.822
2016 231.9 18.813
2017 231.9 18.804
2018 231.9 18.795
2019 231.9 18.785
2020 231.8 18.776
2021 231.8 18.767
2022 231.8 18.758
2023 231.8 18.749
2024 231.8 18.740
2025 231.7 18.730
2026 231.7 18.721
2027 231.7 18.712
2028 231.7 18.703
2029 231.7 18.694
2030 231.7 18.684


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



 
 


wds18002%2B8000b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS 18002+8000 STF 2308 AB (41 Dra) : NOTES
 
 
discov_num notes refcode
STF2308 AB: LDS1882. HJL 257. Statistically the same parallax within the HJL1986
errors would indicate the components are physical.
Linear elements fit nicely at present, but this is a physical pair and
an orbit can be computed at some future date.
AB: H 4 67. MEv2010
AB: A,B are 2.6 mag above MS, both evolved, both SB systems. Orbital
parallax 23.0+-2.2mas. Masses 1.39,1.30,1.32,1.20. Tok2014d
BAG 6 A: 41 Dra. Spectroscopic binary, P = 1247.2d, with the highest known
eccentricity to date, e = 0.975.
Elements P, T, and e for the Balega et al. (1997) orbit were adopted Bag1997a
from the spectroscopic orbit of Tokovinin (1995). Tok1995b
Combined spectroscopic/speckle solution by Tokovinin et al. (2003), Tok2003
deriving masses (1.28 +/- 0.15, 1.20 +/- 0.14 Msun) and orbital
parallax (23.0 +/- 2.2 mas). Authors note earlier elements and discuss
possibility of orbital evolution.
Effective temperatures for the two components are 6370+/-20 and
6410+/-20K, log g 4.05+/-0.10 and 4.20+/-0.10. Abundances for both
components are very near solar. Bag2005b
Aa,Ab: Malkov et al. (2012) derive dynamical, photometric, and
spectroscopic masses 7.75 +/- 5.22, 3.34, and 2.24 Msun, respectively. Mlk2012
B: 40 Dra = BD+79@570. B is also a spectroscopic binary, P = 10.53d.
 
 
REFERENCES
 
 
refcode metd author reference
Bag1997a S j Balega, I.I., Balega, Yu.Yu., Falcke, H., Osterbart, R., Reinheimer, T., Scholler, 1997SvAL...23..172B
Bag1997a +orb M., & Weigelt, G.
Bag1997a SvAL 23, 172, 1997
Bag2005b orb j Balega, Yu.Yu., Leushin, V.V., & Weigelt, G. 2005ARep...49..217B
Bag2005b +S Astron. Reports 49, 217, 2005
HJL1986 Pa - Halbwachs, J.L. 1986A&AS...66..131H
HJL1986 A&AS 66, 131, 1986
HJL1986 (Possible CPM pairs from AGK2/3. Coarse astrometry, incl. mean 1950 dates, added
HJL1986 only for previously unknown pairs. Table 1: HJL 1 - 326, Table 2: HJL1001 - 1113)
Kis1996 orb - Kiselev, A.A. & Romanenko, L.G. 1996ARep...40..795K
Kis1996 ARep 40, 795, 1996 (SvA 73, 875, 1996)
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Tok1995b orb - Tokovinin, A.A. 1995PAZh...21..286T
Tok1995b Pisma Astron. Zhur. 21, 286, 1995
Tok2003 S j Tokovinin, A.A., Balega, Y.Y., Pluzhnik, E.A., Shatsky, N.I., Gorynya, N.A., & 2003A&A...409..245T
Tok2003 +orb Weigelt, G.
Tok2003 A&A 409, 245, 2003
Tok2014d E2 - Tokovinin, A. 2014AJ....147...86T
Tok2014d AJ 147, 86, 2014
 
 
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
18002+8000 STF2308 AB 2007 136 232 18.6 5.70 6.00 F7V F7V NLDV 180009.07+800013.7
18002+8000 STF2308 AB 2008 137 232 18.6 5.70 6.00 F7V F7V NLDV 180009.07+800013.7
18002+8000 STF2308 AB 2010 139 232 18.7 5.70 6.00 F7V F7V NLDV 180009.07+800013.7
18002+8000 STF2308 AB 2012 142 230 19.5 5.70 6.00 F7V F7V NCDV 180009.07+800013.7
18002+8000 STF2308 AB 2013 144 231 18.7 5.70 6.00 F7V F7V NCDV 180009.07+800013.7
18002+8000 STF2308 AB 2014 145 232 18.6 5.70 6.00 F7V F7V NCDV 180009.07+800013.7
18002+8000 STF2308 AB 2016 170 232 18.7 5.70 6.00 F7V+F7V NC V 180009.07+800013.7
18002+8000 STF2308 AB 2017 171 232 18.7 5.70 6.00 F7V+F7V NC V 180009.07+800013.7
18002+8000 STF2308 AB 2018 173 232 18.7 5.70 6.00 F7V+F7V NC V 180009.07+800013.7
18002+8000 STF2308 AB 2019 181 232 18.7 5.70 6.00 F7V+F7V NO V 180009.07+800013.7
18002+8000 STF2308 AB 2022 184 232 18.9 5.70 6.00 F7V+F7V NO V 180009.07+800013.7

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

 
 
WDS 18002+8000 STF 2308 AB (41 Dra) : VISUAL OBSERVATIONS REPORTS
 
 
Show date username difficulty separation pa_estim interest notes
Show 22/08/04 daedalus1 mean difficulty separated 232   Seeing Pickering 5, poor. Measures: theta 232, rho 18.9 +/- 0.18

 
 
WDS 18002+8000 STF 2308 AB (41 Dra) : MEASURES
 
 
No records found.

 
 
WDS 18002+8000 (41 Dra) : VIRTUAL EYEPIECE
 
 

18002+8000 STF2308A mag 5.7 Sp F7V 18002+8000 BAG   6Ab sep 0.1 P.A. 350.40 mag 6.69 Sp F7V 18002+8000 STF2308B sep 11.9 P.A. 192.50 mag 6 Sp F7V 18002+8000 STF2308C sep 143.8 P.A. 167.70 mag 8.34 virtual eyepiece
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Pass over with the mouse cursor to display the catalog designation.

Radius:
Components only
 
 
WDS 18002+8000 (41 Dra) : ALADIN DSS IMAGE @ 18h 00m 09.07s +80° 00' 13.7"
 
 
 
 
WDS 18002+8000 STF 2308 AB (41 Dra) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only


18002+8000  STF2308AB distance=0' 17570+7944  MFL 237 distance=18' 17458+8003  UC 3399 distance=38' 17515+8038  MFL 219 distance=44' 17462+8032  LDS1877 distance=48' 18166+8027  LDS1884 distance=50' 18148+8035  SKF1316 distance=52' 17403+7927  LDS1875 distance=63' 18077+7858  SKF1082 distance=66' 17403+7915  MLR 206 distance=70' 17450+8109  MFL 231 distance=79' 17527+8122  MFL 252 distance=84' 17430+8115  MFL 218 distance=86' 18053+8129  STF2326 distance=90' 17569+7829  CVR 208 distance=93' 17473+7823  NSN 697 distance=104' 18120+7814  LOC 363 distance=112' 17533+7802  MFL 213 distance=120' 18110+7712  HU  928 distance=172' 17484+7702  LDS1879 distance=182' 18175+7652  LOC 362 distance=195' 17590+7634  LDS1881 distance=206' 17478+8326  TOI1147 distance=208' 17505+7635  BVD 332 distance=208' 18196+7636  HU  929 distance=213' 18029+7628  LOC 360AB distance=213' 17462+7629  MLR 209 distance=216' 17422+7625  KPP2682 distance=217' 17578+8351  UC 3457 distance=232' 17492+8352  MFL 214 distance=234' 17530+8354  STT 349 distance=235' 17580+7600  TDT 598 distance=241' 18007+8401  LOC 366 distance=241' 17477+7603  TDT 508 distance=241' 18039+8409  LDS1883 distance=249' 18028+7547  STF2302AB distance=253' 18028+7547  STF2302AC distance=253' 18028+7547  STF2302BC distance=253' 17474+7549  MLR 210 distance=255' 18014+8436  HU   65AB distance=276' 18014+8436  HU   65AC distance=276' 18014+8436  FOX 216AD distance=276' 18060+8439  KPP4083 distance=280' grafico limitrofi
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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 18002+8000 BAG 6 Aa,Ab 316 0.1
Show 18002+8000 STF2308 AB 232 18.9
Show 18002+8000 STF2308 AC 129 225.3
Show 17570+7944 MFL 237 177 4.9 18
Show 17458+8003 UC 3399 335 48.9 38
Show 17515+8038 MFL 219 81 19.5 44
Show 17462+8032 LDS1877 176 10.5 48
Show 18166+8027 LDS1884 108 5.7 50
Show 18148+8035 SKF1316 205 54.6 52
Show 17403+7927 LDS1875 149 110.3 63
Show 18077+7858 SKF1082 280 1.9 66
Show 17403+7915 MLR 206 26 1.3 70
Show 17450+8109 MFL 231 319 9.9 79
Show 17527+8122 MFL 252 323 8.7 84
Show 17430+8115 MFL 218 70 4.0 86
Show 18053+8129 STF2326 194 16.0 90
Show 17569+7829 CVR 208 276 53.8 93
Show 17473+7823 NSN 697 106 4.0 104
Show 18120+7814 LOC 363 67 2.1 112
Show 17533+7802 MFL 213 218 8.2 120
Show 18110+7712 HU 928 155 1.8 172
Show 17484+7702 LDS1879 35 60.8 182
Show 18175+7652 LOC 362 289 7.1 195
Show 17590+7634 LDS1881 179 11.3 206
Show 17478+8326 TOI1147 346 0.4 208
Show 17505+7635 BVD 332 169 17.7 208
Show 18196+7636 HU 929 111 1.8 213
Show 18029+7628 LOC 360 AB 243 1.3 213
Show 17462+7629 MLR 209 53 2.2 216
Show 17422+7625 KPP2682 347 15.5 217
Show 17578+8351 UC 3457 310 32.8 232
Show 17492+8352 MFL 214 257 15.0 234
Show 17530+8354 STT 349 52 0.5 235
Show 17580+7600 TDT 598 210 2.5 241
Show 18007+8401 LOC 366 86 6.5 241
Show 17477+7603 TDT 508 106 0.5 241
Show 18039+8409 LDS1883 161 32.0 249
Show 18028+7547 STF2302 AB 248 5.7 253
Show 18028+7547 STF2302 AC 278 22.9 253
Show 18028+7547 STF2302 BC 287 18.3 253
Show 17474+7549 MLR 210 82 0.6 255
Show 18014+8436 HU 65 AB 257 1.7 276
Show 18014+8436 HU 65 AC 197 9.2 276
Show 18014+8436 FOX 216 AD 133 26.1 276
Show 18060+8439 KPP4083 45 7.3 280

 
 
WDS 18002+8000 : COMPONENTS
 
 
  A Ab B
Ab pa=350.4°
sep=0.07"
 
B pa=192.5°
sep=11.92"
pa=192.4°
sep=11.99"
 
C pa=167.7°
sep=143.83"
pa=167.7°
sep=143.90"
pa=165.6°
sep=133.10"
 
 
18002+8000 A
 
 
Name 41 Dra Coord arcsec 2000 180009.07+800013.7 Mag 5.7 Spectral class F7V (yellow-white)
PmRA 47.00 PmDE 124.0 SAO 8996 HIP 88136
Tycho2 4578-01433-1 HD 166866 HR 6810 GC 24669
BD BD+79 571 Flamsteed 41 Draconis Flamsteed name 41 Dra
Tycho2
Tycho2 4578-01433-1 Pflag RAmdeg 270.03836044 DEmdeg 80.00409427
PmRA 41.1 PmDE 122.2 E RAmdeg 4 E DEmdeg 4
E pmRA 0.8 E pmDE 0.9 EpRAm 1991.35 EpDEm 1991.46
Num 14 Q RAmdeg 1.2 Q DEmdeg 1.5 Q pmRA 1.1
Q pmDE 1.4 BTmag 6.231 E BTmag 0.014 VTmag 5.699
E VTmag 0.009 Prox 190 TYC T HIP 88136
CCDM A RAdeg 270.03781639 DEdeg 80.00381472 EpRA 1990 1.73
EpDE 1990 1.77 E RAdeg 3.6 E DEdeg 3.6 Posflg
Corr 0.0
SAO
SAO 8996 DelFlag RA1950 PmRA1950 0.0155
DE1950 PmDE1950 0.12 Vmag 5.8 SpType F5
Double code Source 70 CatNum 24669 DM BD+79 571
DMcomp BDsup HD 166866 M HD 0
GC 24669 RA1950rad 4.72936593 DE1950rad 1.39626127 PmRA2000 0.0163
PmDE2000 0.122
Hipparcos
Catalog H HIP 88136 Proxy RAhms 18 00 09.07
DEdms +80 00 13.7 Vmag 5.74 VarFlag R Vmag H
RAdeg 270.038 DEdeg 80.0038 AstroRef A Plx 18.84
CCDM 18002+8000 N CCDM I Nsys 2 Ncomp 1
MultFlag C Source P Qual A M HIP
Theta Rho HD 166866 BD BD+79 571
CD CP Dm number +79 571 VIred 0.58
SpType K2Vvar R SpType Coord arcsec 2000 180009.07+800013.7
Hipparcos 2
HIP 88136 Sn 95 So 3 Nc 1
RArad 4.7130483536 DErad 1.3963295517 Plx 15.74 PmRA 41.35
PmDE 127.7 E RArad 3 E DErad 3.48 E Plx 3.52
E pmRA 3.02 E pmDE 4.33 Hpmag 5.8579 E Hpmag 0.0345
SHp 0.174 VA 0 BV 0.516 E BV 0.004
VI 0.59
CCDM
Ccdm 18002+8000 RComp Comp A Note1
Note2 Discov num DRAs -2.80 DDEs 14.5
R dRAs 10 Year Theta Rho
Obs 3 Vmag 5.8 Sp F5 PmNote *
PmRA 41 PmDE 120 Dm number +79 571 Cat1 BD
Name2 +79 491 Cat2 AGK2/3 HD 166866 M HD
ADS BDS A11061 M ADS BDS N IDS IDS 18076N7959A
HIC 88136
 
 
18002+8000 Ab
 
 
Coord arcsec 2000 180009.07+800013.8 Mag 6.69 Spectral class F7V (yellow-white) Calc delta mag 0.47
Calc coord yes
 
 
18002+8000 B
 
 
Coord arcsec 2000 180008.08+800002.1 Mag 6 Spectral class F7V (yellow-white) PmRA 55.00
PmDE 131.0 Flamsteed 40 Draconis Flamsteed name 40 Dra Calc delta mag 0.22
Calc coord yes
CCDM
Ccdm 18002+8000 RComp Comp B Note1
Note2 Discov num STF2308 DRAs -8.51 DDEs 2.7
R dRAs 10 Year 1984 Theta 234 Rho 19.0
Obs 99 Vmag 6.2 Sp F5 PmNote *
PmRA 46 PmDE 127 Dm number +79 570 Cat1 BD
Name2 +79 490 Cat2 AGK2/3 HD 166865 M HD
ADS BDS A11061 M ADS BDS N IDS IDS 18076N7959B
HIC 88127
 
 
18002+8000 C
 
 
Coord arcsec 2000 180020.81+795753.2 Mag 8.34 PmRA 2.00 PmDE 4.0
Calc delta mag 2.12 Calc coord yes
CCDM
Ccdm 18002+8000 RComp Comp C Note1
Note2 Discov num STF2308 DRAs 64.49 DDEs -123.2
R dRAs 10 Year 1984 Theta 128 Rho 223.7
Obs 2 Vmag 9.2 Sp G5 PmNote *
PmRA -15 PmDE 21 Dm number +79 574 Cat1 BD
Name2 +79 492 Cat2 AGK2/3 HD M HD
ADS BDS A11061 M ADS BDS N IDS IDS 18076N7959C
HIC