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Current system
18166-2033
MCA 51
17 Sgr


Nearby doubles
6' : 18168-2027
ARA1144

8' : 18163-2027
SKF1039

11' : 18173-2029
BHA 26

11' : 18167-2022
SKF 99

17' : 18178-2039
ARA1146

22' : 18152-2023
BU 286AB

23' : 18152-2044
TOK 59AB

25' : 18163-2008
ARA1143

29' : 18155-2057
TDS 911

33' : 18162-2105
ARA1523

34' : 18158-2001
CLL 12

37' : 18146-2055
KPP1769

40' : 18140-2052
J 1622

41' : 18154-1956
B 1883

42' : 18171-1952
HJ 2827

43' : 18150-1955
HJ 2823AB

45' : 18157-1950
B 1884

50' : 18177-2120
BRT1525

50' : 18131-2024
ARA1141AB

51' : 18138-2104
H 5 7AB
Polis

52' : 18136-2101
GLP 13

54' : 18150-1945
TOB 276

55' : 18128-2024
DON 886

55' : 18177-1940
BU 246AB

57' : 18203-2055
BRT1529

57' : 18190-2118
ARA1526



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Neglected List I
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

18166-2033 MCA 51 (17 Sgr)

 
 
18h 16m 35.37s -20° 32' 40.1" P.A. 321.00 sep 0.1 mag 7.24,8.89 Sp G5IV+A5 dist. 180.51 pc (588.82 l.y.)
 
 
Coord 2000 18166-2033 Discov num MCA  51 Comp Coord arcsec 2000 18 16 35.37 -20 32 40.1
Date first 1976 Date last 2021 Obs 19
Pa first 313 Pa last 320.9 P.A. Now (θ) 320.9°
Sep first 0.3 Sep last 0.063 Sep. Now (ρ) 0.063"
Mag pri 7.24 Mag sec 8.89 delta mag (ΔM) 1.65 Spectral class G5IV+A5 (yellow/white)
Pri motion ra +008 Sec motion ra
Pri motion dec -011 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 17 Sgr Constellation Sagittarius SAO 186575 HIP 89567
Tycho2 6273-01426-1 Gaia DR2 4094341269029556864 HD 167570 GC 24918
BD BD-20 5068 Flamsteed 17 Sagittarii Flamsteed name 17 Sgr Distance 180.51
Distance ly 588.82
 
 
ORBITAL ELEMENTS
 
 
Period (P)119y± 56 Periastron (T)2031.15y± 8.12 Semi-major axis (a)0.179a± 0.028
Eccentricity (e)0.5 Inclination (i)91°± 0.6 Longitude of periastron (ω)164.3°± 67.8
Node (Ω)313.7°± 0.6 Notes ReferenceTok2019c
Equinox Last observation2018 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 313.3 0.207
2001 313.3 0.201
2002 313.2 0.195
2003 313.2 0.189
2004 313.1 0.182
2005 313.1 0.176
2006 313.1 0.168
2007 313.0 0.161
2008 312.9 0.153
2009 312.9 0.145
2010 312.8 0.136
2011 312.7 0.127
2012 312.6 0.118
2013 312.5 0.108
2014 312.4 0.098
2015 312.2 0.087
2016 312.0 0.077
2017 311.7 0.066
2018 311.3 0.054
2019 310.6 0.043
2020 309.5 0.031
2021 306.9 0.018
2022 294.4 0.006
2023 151.2 0.007
2024 139.5 0.019
2025 137.0 0.031
2026 135.9 0.042
2027 135.2 0.053
2028 134.8 0.064
2029 134.5 0.072
2030 134.2 0.080


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


 
  


wds18166-2033a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18166-2033 MCA 51 (17 Sgr) : NOTES
 
 
discov_num notes refcode
MCA 51 17 Sgr.
 
 
REFERENCES
 
 
refcode metd author reference
Tok2019c St j Tokovinin, A., Mason, B.D., Mendez, R.A., Horch, E.P. & Briceno, C. 2019AJ....158...48T
Tok2019c +orb AJ 158, 48, 2019
 
 
DISCOVERER
 
 
idgroup discov author
1 MCA McAlister, H.A.
46 MCA McAlister, H.A., Hartkopf, W.I., Bagnuolo, W.G., Sowell, J.R., Franz, O.G., &
46 MCA Evans, D.S.
61 MCA Fu, H.-H., Hartkopf, W.I., Mason, B.D., McAlister, H.A., Dombrowski, E.G., &
61 MCA Franz, O.G.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18166-2033 MCA 51 1992 14 135 0.2 7.24 8.89 G5IV+A5 N 181635.37-203240.1
18166-2033 MCA 51 2018 16 129 0.0 7.24 8.89 G5IV+A5 N 181635.37-203240.1
18166-2033 MCA 51 2019 17 315 0.1 7.24 8.89 G5IV+A5 NO 181635.37-203240.1
18166-2033 MCA 51 2020 18 315 0.1 7.24 8.89 G5IV+A5 NO 181635.37-203240.1
18166-2033 MCA 51 2021 19 321 0.1 7.24 8.89 G5IV+A5 NO 181635.37-203240.1

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

 
 
WDS 18166-2033 MCA 51 (17 Sgr) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18166-2033 MCA 51 (17 Sgr) : MEASURES
 
 
No records found.

 
 
WDS 18166-2033 (17 Sgr) : VIRTUAL EYEPIECE
 
 

18166-2033 MCA 51A mag 7.24 Sp G5IV 18166-2033 MCA 51B mag 8.89 Sp A5 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 18166-2033 (17 Sgr) : ALADIN DSS IMAGE @ 18h 16m 35.37s -20° 32' 40.1"
 
 
 
 
WDS 18166-2033 MCA 51 (17 Sgr) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18166-2033 MCA 51 distance=0' 18168-2027 ARA1144 distance=6' 18163-2027 SKF1039 distance=8' 18173-2029 BHA 26 distance=11' 18167-2022 SKF 99 distance=11' 18178-2039 ARA1146 distance=17' 18152-2023 CHR 255Aa,Ab distance=22' 18152-2023 BU 286AB distance=22' 18152-2023 SNA 83AC distance=22' 18152-2023 SNA 83AD distance=22' 18152-2023 SNA 83AE distance=22' 18152-2044 TOK 59AB distance=23' 18152-2044 SNA 82Aa,Ab distance=23' 18152-2044 SNA 82AC distance=23' 18152-2044 SNA 82AD distance=23' 18163-2008 ARA1143 distance=25' 18155-2057 TDS 911 distance=29' 18162-2105 ARA1523 distance=33' 18158-2001 CLL 12 distance=34' 18146-2055 KPP1769 distance=37' 18140-2052 J 1622 distance=40' 18154-1956 B 1883 distance=41' 18171-1952 HJ 2827 distance=42' 18150-1955 TOB 275CF distance=43' 18150-1955 HJ 2823AB distance=43' 18150-1955 TOB 275AC distance=43' 18150-1955 TOB 275AD distance=43' 18150-1955 TOB 275DE distance=44' 18157-1950 B 1884 distance=45' 18177-2120 BRT1525 distance=50' 18131-2024 J 1621AC distance=50' 18131-2024 ARA1141AB distance=50' 18131-2024 SKF1038CD distance=51' 18138-2104 H 5 7AB (Polis) distance=51' 18138-2104 BU 292AC (Polis) distance=51' 18138-2104 HJ 2822AD (Polis) distance=51' 18138-2104 HJ 2822AE (Polis) distance=51' 18138-2104 SLV 7BD distance=51' 18138-2104 SLV 7BE distance=51' 18136-2101 GLP 13 distance=52' 18150-1945 TOB 276 distance=54' 18128-2024 DON 886 distance=55' 18177-1940 BU 246AB distance=55' 18177-1940 WSI 89Ba,Bb distance=55' 18203-2055 BRT1529 distance=57' 18190-2118 ARA1526 distance=57' 18137-1949 TOB 277 distance=60' 18170-1933 B 2862 distance=60' 18147-1939 J 1623 distance=61' 18196-1944 WRH 30 distance=65' 18135-1945 OCC 467 distance=65' 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 18166-2033 MCA 51 321 0.1
Show 18168-2027 ARA1144 336 9.7 6
Show 18163-2027 SKF1039 336 3.7 8
Show 18173-2029 BHA 26 352 5.5 11
Show 18167-2022 SKF 99 141 3.0 11
Show 18178-2039 ARA1146 351 11.0 17
Show 18152-2023 CHR 255 Aa,Ab 156 0.1 22
Show 18152-2023 BU 286 AB 216 6.1 22
Show 18152-2023 SNA 83 AC 27 5.9 22
Show 18152-2023 SNA 83 AD 281 6.5 22
Show 18152-2023 SNA 83 AE 242 7.3 22
Show 18152-2044 TOK 59 AB 77 1.3 23
Show 18152-2044 SNA 82 Aa,Ab 203 0.0 23
Show 18152-2044 SNA 82 AC 356 2.3 23
Show 18152-2044 SNA 82 AD 108 7.1 23
Show 18163-2008 ARA1143 18 10.9 25
Show 18155-2057 TDS 911 102 1.0 29
Show 18162-2105 ARA1523 90 1.2 33
Show 18158-2001 CLL 12 199 22.9 34
Show 18146-2055 KPP1769 268 13.7 37
Show 18140-2052 J 1622 45 7.7 40
Show 18154-1956 B 1883 53 0.2 41
Show 18171-1952 HJ 2827 253 19.9 42
Show 18150-1955 TOB 275 CF 110 75.5 43
Show 18150-1955 HJ 2823 AB 330 20.3 43
Show 18150-1955 TOB 275 AC 91 23.2 43
Show 18150-1955 TOB 275 AD 47 30.3 43
Show 18150-1955 TOB 275 DE 37 36.3 44
Show 18157-1950 B 1884 85 0.2 45
Show 18177-2120 BRT1525 179 4.4 50
Show 18131-2024 J 1621 AC 301 15.8 50
Show 18131-2024 ARA1141 AB 286 8.0 50
Show 18131-2024 SKF1038 CD 187 4.1 51
Show Polis 18138-2104 H 5 7 AB 258 16.9 51
Show Polis 18138-2104 BU 292 AC 119 25.5 51
Show Polis 18138-2104 HJ 2822 AD 312 48.2 51
Show Polis 18138-2104 HJ 2822 AE 114 50.2 51
Show 18138-2104 SLV 7 BD 331 40.8 51
Show 18138-2104 SLV 7 BE 106 64.4 51
Show 18136-2101 GLP 13 245 25.0 52
Show 18150-1945 TOB 276 345 13.0 54
Show 18128-2024 DON 886 205 4.9 55
Show 18177-1940 BU 246 AB 116 0.5 55
Show 18177-1940 WSI 89 Ba,Bb 321 0.1 55
Show 18203-2055 BRT1529 281 4.2 57
Show 18190-2118 ARA1526 314 12.7 57
Show 18137-1949 TOB 277 130 23.5 60
Show 18170-1933 B 2862 296 7.4 60
Show 18147-1939 J 1623 29 5.7 61
Show 18196-1944 WRH 30 273 0.3 65
Show 18135-1945 OCC 467 -1 0.1 65

 
 
WDS 18166-2033 : COMPONENTS
 
 
  A
B pa=322.7°
sep=0.06"
 
 
18166-2033 A
 
 
Componente originario normalizzato AB Name 17 Sgr Coord arcsec 2000 181635.37-203240.1 Mag 7.24
Spectral class G5IV (yellow) PmRA 8.00 PmDE -11.0 SAO 186575
HIP 89567 Tycho2 6273-01426-1 HD 167570 GC 24918
BD BD-20 5068 Flamsteed 17 Sagittarii Flamsteed name 17 Sgr
Tycho2
Tycho2 6273-01426-1 Pflag RAmdeg 274.14738099 DEmdeg -20.54449227
PmRA 7.3 PmDE -10.7 E RAmdeg 4 E DEmdeg 5
E pmRA 1.0 E pmDE 0.9 EpRAm 1991.47 EpDEm 1991.20
Num 16 Q RAmdeg 1.5 Q DEmdeg 0.8 Q pmRA 1.5
Q pmDE 1.0 BTmag 8.055 E BTmag 0.016 VTmag 6.989
E VTmag 0.010 Prox 999 TYC T HIP 89567
CCDM AB RAdeg 274.14736333 DEdeg -20.54446806 EpRA 1990 1.86
EpDE 1990 1.81 E RAdeg 4.1 E DEdeg 5.0 Posflg P
Corr 0.1
SAO
SAO 186575 DelFlag RA1950 PmRA1950 0.0009
DE1950 PmDE1950 -0.015 Vmag 7.1 SpType +++
Double code Source 70 CatNum 24918 DM BD-20 5068
DMcomp BDsup HD 167570 M HD 9
GC 24918 RA1950rad 4.77177277 DE1950rad -0.35888788 PmRA2000 0.001
PmDE2000 -0.014
Hipparcos
Catalog H HIP 89567 Proxy H RAhms 18 16 35.37
DEdms -20 32 40.1 Vmag 6.89 VarFlag R Vmag G
RAdeg 274.147 DEdeg -20.5445 AstroRef * Plx 5.39
CCDM 18166-2033 N CCDM M Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 132 Rho 0.245 HD 167570 BD BD-20 5068
CD CP Dm number -20 5068 VIred 1
SpType A7: R SpType Coord arcsec 2000 181635.37-203240.1
Hipparcos 2
HIP 89567 Sn 55 So 3 Nc 2
RArad 4.7847740704 DErad -0.3585685544 Plx 5.54 PmRA 4.97
PmDE -9.59 E RArad 0.78 E DErad 0.47 E Plx 0.9
E pmRA 0.98 E pmDE 0.56 Hpmag 7.0231 E Hpmag 0.0009
SHp 0.008 VA 0 BV 1.027 E BV 0.015
VI 1
CCDM
Ccdm 18166-2033 RComp Comp A Note1
Note2 Discov num DRAs -0.64 DDEs 19.7
R dRAs 81 Year Theta Rho
Obs 2 Vmag 7.1 Sp G5 PmNote @
PmRA 6 PmDE -10 Dm number -20 5068 Cat1 BD
Name2 186575 Cat2 SAO HD 167570 M HD
ADS BDS M ADS BDS N N IDS IDS 18107S2034A
HIC 89567
 
 
18166-2033 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 181635.37-203240.1 Mag 8.89 Spectral class A5 (white)
Calc delta mag 1.65 Calc coord yes
CCDM
Ccdm 18166-2033 RComp Comp B Note1
Note2 Discov num MAL 51 DRAs DDEs
R dRAs Year 1976 Theta 134 Rho 0.3
Obs 9 Vmag Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 18107S2034B
HIC 89567