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Current system
18154+5720
HDS 2577
HD 168242


Nearby doubles
12' : 18140+5717
TDT 751

34' : 18132+5749
HDS2571

37' : 18138+5646
TDT 747

56' : 18217+5740
MLR 536

56' : 18086+5710
TDT 704

63' : 18200+5810
CRB 202

79' : 18174+5604
KPP4101AB

79' : 18223+5626
CRB 203

80' : 18077+5632
SLE 139

83' : 18252+5659
MLR 537

87' : 18257+5701
TDT 857

87' : 18127+5557
ES 643

88' : 18186+5844
LDS2410

95' : 18125+5852
LDS2407

96' : 18077+5608
SLE 140

99' : 18116+5854
MLR 356

99' : 18134+5858
TDT 745AB

105' : 18268+5633
STI2375

112' : 18239+5848
STF2323AB

113' : 18025+5638
LDS4772

116' : 18029+5626
STF2278AB

117' : 18278+5622
MLB 136

119' : 18297+5740
LDS2414

122' : 18296+5800
KPP4109

123' : 18053+5550
SLE 137

126' : 18212+5917
LDS2411



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.

18154+5720 HDS 2577 (HD 168242)

 
 
18h 15m 21.73s +57° 20' 08.3" P.A. 330.00 sep 0.2 mag 8.93,9.56 Sp K0 dist. 64.35 pc (209.91 l.y.)
 
 
Coord 2000 18154+5720 Discov num HDS2577 Comp Coord arcsec 2000 18 15 21.73 +57 20 08.3
Date first 1991 Date last 2016 Obs 15
Pa first 139 Pa last 330.4 P.A. Now (θ) 330.4°
Sep first 0.2 Sep last 0.186 Sep. Now (ρ) 0.186"
Mag pri 8.93 Mag sec 9.56 delta mag (ΔM) 0.63 Spectral class K0 (yellow-orange)
Pri motion ra +018 Sec motion ra
Pri motion dec -065 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 168242 Constellation Draco SAO 30845 HIP 89455
Tycho2 3912-01259-1 Gaia DR2 2151781024774974592 HD 168242 BD BD+57 1856
Distance 64.35 Distance ly 209.91
 
 
ORBITAL ELEMENTS
 
 
Period (P)82y± 65 Periastron (T)1997.8y± 6.6 Semi-major axis (a)0.4a± 0.21
Eccentricity (e)0.36± 0.36 Inclination (i)62°± 14 Longitude of periastron (ω)313°± 51
Node (Ω)259°± 19 Notes ReferenceRAO2015
Equinox2000 Last observation2013 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 246.5 0.242
2001 251.4 0.258
2002 255.8 0.272
2003 259.8 0.281
2004 263.6 0.287
2005 267.3 0.291
2006 270.9 0.291
2007 274.6 0.289
2008 278.3 0.284
2009 282.2 0.279
2010 286.3 0.272
2011 290.6 0.264
2012 295.1 0.256
2013 300.0 0.248
2014 305.1 0.240
2015 310.6 0.233
2016 316.5 0.227
2017 322.6 0.222
2018 328.9 0.219
2019 335.3 0.218
2020 341.8 0.219
2021 348.1 0.221
2022 354.3 0.226
2023 0.2 0.232
2024 5.7 0.240
2025 10.9 0.249
2026 15.7 0.259
2027 20.1 0.270
2028 24.1 0.282
2029 27.8 0.294
2030 31.2 0.307


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


 
  


wds18154%2B5720a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18154+5720 HDS 2577 (HD 168242) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
RAO2015 Ag u Riddle, R.L., Tokovinin, A., Mason, B.D., Hartkopf, W.I., Roberts, L.C., Jr., 2015ApJ...799....4R
RAO2015 +orb Baranec, C., Law, N.M., Bui, K., Burse, M.P., Das, H.K., Dekany, R.G.,
RAO2015 Kulkarni, S., Punnadi, S., Ramaprakash, A.N., & Tendulkar, S.P.
RAO2015 ApJ 799, 4, 2015
RAO2015 (Note: Paper includes separation/magnitude difference limits for all stars
RAO2015 observed. These limits have been added to the Interferometric Catalog even for
RAO2015 resolved pairs, to indicate restrictions on any potential additional components.)
 
 
DISCOVERER
 
 
idgroup discov author
1 HDS Hipparcos Double Star (from additional DD list)
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18154+5720 HDS2577 2006 4 273 0.3 8.93 9.56 K0 D 181521.73+572008.3
18154+5720 HDS2577 2007 6 276 0.3 8.93 9.56 K0 D 181521.73+572008.3
18154+5720 HDS2577 2008 7 281 0.3 8.93 9.56 K0 D 181521.73+572008.3
18154+5720 HDS2577 2013 9 307 0.2 8.93 9.56 K0 181521.73+572008.3
18154+5720 HDS2577 2016 11 330 0.2 8.93 9.56 K0 O 181521.73+572008.3

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

 
 
WDS 18154+5720 HDS 2577 (HD 168242) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18154+5720 HDS 2577 (HD 168242) : MEASURES
 
 
No records found.

 
 
WDS 18154+5720 (HD 168242) : VIRTUAL EYEPIECE
 
 

18154+5720 HDS2577A mag 8.93 Sp K0 18154+5720 HDS2577B sep 0.2 P.A. 343.00 mag 9.56 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 18154+5720 (HD 168242) : ALADIN DSS IMAGE @ 18h 15m 21.73s +57° 20' 08.3"
 
 
 
 
WDS 18154+5720 HDS 2577 (HD 168242) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18154+5720 HDS2577 distance=0' 18140+5717 TDT 751 distance=12' 18132+5749 HDS2571 distance=34' 18138+5646 TDT 747 distance=37' 18147+5635 BU 1274A,BC distance=46' 18147+5635 BU 1274BC distance=47' 18147+5635 BU 1274BD distance=47' 18217+5740 MLR 536 distance=56' 18086+5710 TDT 704 distance=56' 18200+5810 CRB 202 distance=63' 18174+5604 KPP4101BD distance=78' 18174+5604 KPP4101AB distance=79' 18174+5604 KPP4101AC distance=79' 18223+5626 CRB 203 distance=79' 18077+5632 SLE 139 distance=80' 18252+5659 MLR 537 distance=83' 18257+5701 TDT 857 distance=87' 18127+5557 ES 643 distance=87' 18186+5844 LDS2410 distance=88' 18125+5852 LDS2407 distance=95' 18077+5608 SLE 140 distance=96' 18116+5854 MLR 356 distance=99' 18134+5858 TDT 745AB distance=99' 18134+5858 KPP4392AC distance=99' 18268+5633 STI2375 distance=105' 18239+5848 STF2323AB distance=112' 18239+5848 STF2323AF distance=112' 18239+5848 STF2323AG distance=112' 18239+5848 STF2323AH distance=112' 18239+5848 STF2323AC distance=112' 18239+5848 STF2323BC distance=112' 18025+5638 LDS4772 distance=113' 18239+5848 STF2323CD distance=113' 18029+5626 STF2278BC distance=116' 18029+5626 STF2278AB distance=116' 18029+5626 STF2278AD distance=116' 18029+5626 SLE 128AE distance=116' 18029+5626 SLE 128AF distance=116' 18029+5626 SLE 128AG distance=116' 18029+5626 STF2278AC distance=116' 18278+5622 MLB 136 distance=117' 18029+5626 STF2278DS distance=118' 18297+5740 LDS2414 distance=119' 18296+5800 KPP4109 distance=122' 18053+5550 SLE 137 distance=123' 18212+5917 LDS2411 distance=126' 18301+5805 MLR 357 distance=127' 18004+5704 STI2364 distance=128' 18254+5539 LDS4786 distance=131' 18005+5624 SZM 1 distance=132' 18106+5512 STI2370 distance=135' 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 18154+5720 HDS2577 330 0.2
Show 18140+5717 TDT 751 20 0.7 12
Show 18132+5749 HDS2571 310 0.3 34
Show 18138+5646 TDT 747 140 1.0 37
Show 18147+5635 BU 1274 A,BC 238 93.7 46
Show 18147+5635 BU 1274 BC 144 1.0 47
Show 18147+5635 BU 1274 BD 5 5.3 47
Show 18217+5740 MLR 536 193 0.8 56
Show 18086+5710 TDT 704 305 0.6 56
Show 18200+5810 CRB 202 160 32.8 63
Show 18174+5604 KPP4101 BD 133 7.6 78
Show 18174+5604 KPP4101 AB 327 53.1 79
Show 18174+5604 KPP4101 AC 326 56.8 79
Show 18223+5626 CRB 203 171 26.0 79
Show 18077+5632 SLE 139 333 6.6 80
Show 18252+5659 MLR 537 56 0.6 83
Show 18257+5701 TDT 857 221 0.6 87
Show 18127+5557 ES 643 49 3.9 87
Show 18186+5844 LDS2410 264 5.4 88
Show 18125+5852 LDS2407 329 126.9 95
Show 18077+5608 SLE 140 166 6.8 96
Show 18116+5854 MLR 356 149 1.4 99
Show 18134+5858 TDT 745 AB 326 1.3 99
Show 18134+5858 KPP4392 AC 150 4.5 99
Show 18268+5633 STI2375 176 4.5 105
Show 18239+5848 STF2323 AB 348 3.6 112
Show 18239+5848 STF2323 AF 80 150.5 112
Show 18239+5848 STF2323 AG 244 35.8 112
Show 18239+5848 STF2323 AH 93 44.2 112
Show 18239+5848 STF2323 AC 20 88.9 112
Show 18239+5848 STF2323 BC 20 86.5 112
Show 18025+5638 LDS4772 346 9.9 113
Show 18239+5848 STF2323 CD 68 198.2 113
Show 18029+5626 STF2278 BC 146 6.0 116
Show 18029+5626 STF2278 AB 31 35.1 116
Show 18029+5626 STF2278 AD 189 197.9 116
Show 18029+5626 SLE 128 AE 279 46.4 116
Show 18029+5626 SLE 128 AF 278 85.2 116
Show 18029+5626 SLE 128 AG 250 127.2 116
Show 18029+5626 STF2278 AC 38 33.6 116
Show 18278+5622 MLB 136 243 2.1 117
Show 18029+5626 STF2278 DS 213 6.7 118
Show 18297+5740 LDS2414 198 7.4 119
Show 18296+5800 KPP4109 95 9.8 122
Show 18053+5550 SLE 137 171 9.3 123
Show 18212+5917 LDS2411 277 117.7 126
Show 18301+5805 MLR 357 24 0.6 127
Show 18004+5704 STI2364 299 16.8 128
Show 18254+5539 LDS4786 73 6.0 131
Show 18005+5624 SZM 1 87 20.4 132
Show 18106+5512 STI2370 295 5.4 135

 
 
WDS 18154+5720 : COMPONENTS
 
 
  A
B pa=343.0°
sep=0.17"
 
 
18154+5720 A
 
 
Componente originario normalizzato AB Name HD 168242 Coord arcsec 2000 181521.73+572008.3 Mag 8.93
Spectral class K0 (yellow-orange) PmRA 18.00 PmDE -65.0 SAO 30845
HIP 89455 Tycho2 3912-01259-1 HD 168242 BD BD+57 1856
Tycho2
Tycho2 3912-01259-1 Pflag RAmdeg 273.84061638 DEmdeg 57.33548609
PmRA 14.8 PmDE -64.5 E RAmdeg 7 E DEmdeg 7
E pmRA 1.5 E pmDE 1.5 EpRAm 1991.13 EpDEm 1991.13
Num 9 Q RAmdeg 1.1 Q DEmdeg 1.4 Q pmRA 1.1
Q pmDE 1.5 BTmag 9.191 E BTmag 0.018 VTmag 8.388
E VTmag 0.013 Prox 999 TYC T HIP 89455
CCDM AB RAdeg 273.84055194 DEdeg 57.33563667 EpRA 1990 1.64
EpDE 1990 1.61 E RAdeg 6.8 E DEdeg 6.7 Posflg P
Corr 0.0
SAO
SAO 30845 DelFlag RA1950 PmRA1950 0.0017
DE1950 PmDE1950 -0.069 Vmag 8.6 SpType K0
Double code Source 38 CatNum 9711 DM BD+57 1856
DMcomp BDsup HD 168242 M HD 0
GC RA1950rad 4.77578993 DE1950rad 1.00039059 PmRA2000 0.0025
PmDE2000 -0.069
Hipparcos
Catalog H HIP 89455 Proxy H RAhms 18 15 21.73
DEdms +57 20 08.3 Vmag 8.3 VarFlag R Vmag H
RAdeg 273.841 DEdeg 57.3356 AstroRef * Plx 16.44
CCDM 18154+5720 N CCDM H Nsys 1 Ncomp 2
MultFlag C Source S Qual A M HIP AB
Theta 139 Rho 0.16 HD 168242 BD BD+57 1856
CD CP Dm number +57 1856 VIred 0.72
SpType K0 R SpType Coord arcsec 2000 181521.73+572008.3
Hipparcos 2
HIP 89455 Sn 55 So 3 Nc 2
RArad 4.7794192467 DErad 1.0006957113 Plx 15.54 PmRA 16.85
PmDE -65.46 E RArad 0.6 E DErad 0.48 E Plx 0.65
E pmRA 0.61 E pmDE 0.68 Hpmag 8.4472 E Hpmag 0.0016
SHp 0.015 VA 0 BV 0.726 E BV 0.012
VI 0.78
CCDM
Ccdm 18154+5720 RComp Comp A Note1
Note2 Discov num DRAs -2.25 DDEs 7.8
R dRAs 82 Year Theta Rho
Obs 2 Vmag 8.9 Sp K0 PmNote *
PmRA 18 PmDE -65 Dm number +57 1856 Cat1 BD
Name2 +57 1156 Cat2 AGK2/3 HD 168242 M HD
ADS BDS M ADS BDS N IDS IDS
HIC 89455
 
 
18154+5720 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 181521.72+572008.5 Mag 9.56 Calc delta mag 0.63
Calc coord yes
CCDM
Ccdm 18154+5720 RComp Comp B Note1
Note2 Discov num HDS DRAs -2.24 DDEs 7.7
R dRAs 82 Year 1991 Theta 139 Rho 0.2
Obs 1 Vmag 9.6 Sp PmNote *
PmRA 18 PmDE -65 Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS
HIC 89455