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Doubles in session


Current system
18039-2419
SNA 79
HD 164816


Nearby doubles
4' : 18039-2422
SNA 78

6' : 18037-2423
AEN 1AB

6' : 18042-2415
BU 1126AB

7' : 18044-2421
TDT 662

8' : 18044-2423
RBR 8

11' : 18047-2421
HJ 5010

19' : 18026-2415
RST3149AB

30' : 18061-2412
B 376AB

33' : 18056-2356
ARA2213

41' : 18023-2452
RST3148

41' : 18054-2343
TDT 672

43' : 18009-2413
RST3147

55' : 18049-2326
ARA2210

57' : 18056-2328
ARA2212

57' : 18055-2326
SKF2529AB

61' : 18005-2341
ALD 110AB

61' : 18057-2514
OCC1041AB

65' : 17598-2349
GUL 1

65' : 18051-2317
B 375

65' : 18041-2523
OCC1036AB

65' : 18036-2523
OCC1035

66' : 18022-2318
B 2851

66' : 17592-2426
RST3143

67' : 18004-2333
RST3146

68' : 18034-2526
OCC1034

70' : 18040-2529
HDO 148



Selections
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Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

18039-2419 SNA 79 (HD 164816)

 
 
18h 03m 56.84s -24° 18' 45.1" P.A. 81.00 sep 0.1 mag 7.10,10.50 Sp O4V((f))
 
 
Coord 2000 18039-2419 Discov num SNA  79 Comp Coord arcsec 2000 18 03 56.84 -24 18 45.1
Date first 2012 Date last 2013 Obs 2
Pa first 87 Pa last 81 P.A. Now (θ) 81°
Sep first 0.1 Sep last 0.057 Sep. Now (ρ) 0.057"
Mag pri 7.10 Mag sec 10.50 delta mag (ΔM) 3.4 Spectral class O4V((f)) (blue)
Pri motion ra -000 Sec motion ra
Pri motion dec -002 Sec motion dec
Notes N V K (See Notes, Proper motion indicates physical, K-band or other infrared magnitudes)
Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 164816 Constellation Sagittarius SAO 186207 Tycho2 6842-01472-1
Gaia DR2 4066023415781257984 HD 164816 GC 24577
 
 
WDS 18039-2419 SNA 79 (HD 164816) : NOTES
 
 
discov_num notes refcode
SNA 79 The faint but clear companion at 57mas is not the known SB2 system
(P=3.8d, a sin i = 16Rsun), which is separated by 0.07mas assuming a
distance of 1 kpc (Trepl et al. 2012, MNRAS 427, 1014). Moreover, the
SB2 has nearly equal masses, while the resolved pair has dH=3.4,
pointing to quite different masses. The object is also detected in X
rays. Trepl et al. identified a soft X-ray excess and 10sec pulsation
which they interpret as the signature of a neutron star in the system.
Our detection is probably an active later-type object, which may
provide an alternaitve explanation to the X-ray excess. Sna2014
 
 
REFERENCES
 
 
refcode metd author reference
Sna2014 Kv j Sana, H., LeBouquin, J.-B., Lacour, S., Berger, J.-P., Duvert, G., Gauchet, L., 2014ApJS..215...15S
Sna2014 +A Norris, B., Olofsson, J., Pickel, D., Zins, G., Absil, O., de Koter, A.,
Sna2014 Kratter, K., Schnurr, O., & Zinnecker, H.
Sna2014 ApJS 215, 15, 2014
Sna2014 (NACO companions in Table 6 assumed physical if quoted probability of spurious
Sna2014 detection <10%, optical if >90%, otherwise indeterminate)
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18039-2419 SNA 79 2013 2 81 0.1 7.10 10.50 O9.5V V K 180356.84-241845.1

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

 
 
WDS 18039-2419 SNA 79 (HD 164816) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18039-2419 SNA 79 (HD 164816) : MEASURES
 
 
No records found.

 
 
WDS 18039-2419 (HD 164816) : VIRTUAL EYEPIECE
 
 

18039-2419 SNA 79A mag 7.1 Sp O4V((f)) 18039-2419 SNA 79B mag 10.5 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 18039-2419 (HD 164816) : ALADIN DSS IMAGE @ 18h 03m 56.84s -24° 18' 45.1"
 
 
 
 
WDS 18039-2419 SNA 79 (HD 164816) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18039-2419 SNA 79 distance=1' 18039-2422 SNA 78 distance=4' 18037-2423 AEN 1AB distance=6' 18037-2423 SBE 1Aa,Ab distance=6' 18042-2415 BU 1126AB distance=6' 18042-2415 HJ 5009AB,C distance=6' 18042-2415 DAW 218AB,D distance=6' 18044-2421 TDT 662 distance=7' 18044-2423 RBR 8 distance=8' 18047-2421 HJ 5010 distance=11' 18026-2415 RST3149AB distance=19' 18026-2415 ARG 31AC distance=19' 18026-2415 BU 1462AD distance=19' 18061-2412 B 376AB distance=30' 18061-2412 SNA 81Aa,Ab distance=30' 18061-2412 SNA 81AC distance=30' 18061-2412 SNA 81AD distance=30' 18056-2356 ARA2213 distance=33' 18023-2452 RST3148 distance=41' 18054-2343 TDT 672 distance=41' 18009-2413 RST3147 distance=43' 18049-2326 ARA2210 distance=55' 18056-2328 ARA2212 distance=57' 18055-2326 SKF2529AB distance=57' 18055-2326 SKF2529AC distance=57' 18055-2326 SKF2529BC distance=57' 18005-2341 SKF2528DE distance=61' 18005-2341 ALD 110AB distance=61' 18005-2341 SKF2528AC distance=61' 18005-2341 SKF2528AD distance=61' 18057-2514 OCC1041AB distance=61' 18057-2514 OCC1041AC distance=61' 17598-2349 GUL 1 distance=65' 18051-2317 B 375 distance=65' 18041-2523 OCC1036AB distance=65' 18041-2523 OCC1036AC distance=65' 18036-2523 OCC1035 distance=65' 18022-2318 B 2851 distance=66' 17592-2426 RST3143 distance=66' 18004-2333 RST3146 distance=67' 18034-2526 OCC1034 distance=68' 18040-2529 HDO 148 distance=70' 18055-2312 ARA2211 distance=71' 17585-2425 B 366 distance=75' 18027-2306 RST3151 distance=75' 18064-2525 RCH 6 distance=75' 18029-2533 OCC1033AB distance=76' 18029-2533 OCC1033AC distance=76' 17586-2441 DAM 687A,BC distance=76' 17586-2441 RST3139BC distance=76' 18094-2432 BRT3062 distance=77' 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 18039-2419 SNA 79 81 0.1 1
Show 18039-2422 SNA 78 69 0.0 4
Show 18037-2423 AEN 1 AB 9 3.5 6
Show 18037-2423 SBE 1 Aa,Ab 222 0.0 6
Show 18042-2415 BU 1126 AB 55 0.6 6
Show 18042-2415 HJ 5009 AB,C 21 4.6 6
Show 18042-2415 DAW 218 AB,D 138 24.9 6
Show 18044-2421 TDT 662 121 1.8 7
Show 18044-2423 RBR 8 318 3.1 8
Show 18047-2421 HJ 5010 351 3.1 11
Show 18026-2415 RST3149 AB 62 1.7 19
Show 18026-2415 ARG 31 AC 26 35.6 19
Show 18026-2415 BU 1462 AD 196 27.3 19
Show 18061-2412 B 376 AB 97 1.9 30
Show 18061-2412 SNA 81 Aa,Ab 116 0.0 30
Show 18061-2412 SNA 81 AC 225 6.6 30
Show 18061-2412 SNA 81 AD 8 7.9 30
Show 18056-2356 ARA2213 235 14.5 33
Show 18023-2452 RST3148 135 0.5 41
Show 18054-2343 TDT 672 103 1.6 41
Show 18009-2413 RST3147 205 0.2 43
Show 18049-2326 ARA2210 145 8.7 55
Show 18056-2328 ARA2212 155 10.0 57
Show 18055-2326 SKF2529 AB 56 1.8 57
Show 18055-2326 SKF2529 AC 271 1.5 57
Show 18055-2326 SKF2529 BC 251 3.1 57
Show 18005-2341 SKF2528 DE 223 3.0 61
Show 18005-2341 ALD 110 AB 73 3.9 61
Show 18005-2341 SKF2528 AC 19 1.7 61
Show 18005-2341 SKF2528 AD 203 6.5 61
Show 18057-2514 OCC1041 AB -1 0.0 61
Show 18057-2514 OCC1041 AC -1 0.0 61
Show 17598-2349 GUL 1 243 3.7 65
Show 18051-2317 B 375 168 0.9 65
Show 18041-2523 OCC1036 AB -1 0.0 65
Show 18041-2523 OCC1036 AC -1 0.0 65
Show 18036-2523 OCC1035 -1 0.0 65
Show 18022-2318 B 2851 156 10.5 66
Show 17592-2426 RST3143 260 2.5 66
Show 18004-2333 RST3146 228 0.5 67
Show 18034-2526 OCC1034 -1 0.0 68
Show 18040-2529 HDO 148 15 4.6 70
Show 18055-2312 ARA2211 89 10.8 71
Show 17585-2425 B 366 43 1.5 75
Show 18027-2306 RST3151 32 1.3 75
Show 18064-2525 RCH 6 208 2.3 75
Show 18029-2533 OCC1033 AB -1 0.0 76
Show 18029-2533 OCC1033 AC -1 0.1 76
Show 17586-2441 DAM 687 A,BC 205 12.3 76
Show 17586-2441 RST3139 BC 145 1.2 76
Show 18094-2432 BRT3062 125 4.6 77

 
 
WDS 18039-2419 : COMPONENTS
 
 
  A
B pa=80.1°
sep=0.05"
 
 
18039-2419 A
 
 
Componente originario normalizzato AB Name HD 164816 Coord arcsec 2000 180356.84-241845.1 Mag 7.1
Spectral class O4V((f)) (blue) PmRA 0.00 PmDE -2.0 SAO 186207
Tycho2 6842-01472-1 HD 164816 GC 24577 DM CD-2413816
Tycho2
Tycho2 6842-01472-1 Pflag RAmdeg 270.98684548 DEmdeg -24.31253053
PmRA -0.1 PmDE -1.6 E RAmdeg 4 E DEmdeg 5
E pmRA 1.3 E pmDE 1.4 EpRAm 1991.58 EpDEm 1991.43
Num 13 Q RAmdeg 1.2 Q DEmdeg 0.8 Q pmRA 1.3
Q pmDE 0.7 BTmag 7.033 E BTmag 0.015 VTmag 7.076
E VTmag 0.011 Prox 999 TYC HIP
CCDM RAdeg 270.98684583 DEdeg -24.31252694 EpRA 1990 1.84
EpDE 1990 1.81 E RAdeg 4.0 E DEdeg 5.0 Posflg
Corr -0.1
SAO
SAO 186207 DelFlag RA1950 PmRA1950 0.0014
DE1950 PmDE1950 -0.005 Vmag 7.3 SpType B0
Double code Source 70 CatNum 24577 DM CD-2413816
DMcomp BDsup HD 164816 M HD 0
GC 24577 RA1950rad 4.7162393 DE1950rad -0.42438574 PmRA2000 0.0013
PmDE2000 -0.004
 
 
18039-2419 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 180356.84-241845.1 Mag 10.5 Calc delta mag 3.4
Calc coord yes