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Doubles in session


Current system
16212-2536
BLM 4 Aa,Ab


Nearby doubles
31' : 16192-2551
USD1266

37' : 16237-2548
RST3019

40' : 16186-2518
LUH 2

41' : 16240-2525
TOK 773

43' : 16243-2545
USD1454AB

47' : 16188-2610
REP 34

54' : 16250-2521
HDS2320

54' : 16238-2616
LAF 134

55' : 16244-2502
B 308AB

56' : 16241-2457
TOK 775

59' : 16183-2619
BOY 22

60' : 16253-2512
RAT 1AB

61' : 16168-2552
KOU 60

64' : 16250-2500
REP 36

66' : 16250-2456
REP 35AB

66' : 16188-2633
REP 33

67' : 16163-2542
USD1141

67' : 16175-2451
TOK 769

68' : 16228-2431
USD1423

71' : 16207-2426
KSA 100

71' : 16263-2521
REP 38

72' : 16256-2614
ELP 36

72' : 16265-2527
RAT 6

73' : 16204-2423
LDS 557

74' : 16161-2507
LDS4658

75' : 16164-2459
KOU 59AB



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.

16212-2536 BLM 4 Aa,Ab

 
 
16h 21m 11.32s -25° 35' 33.9" P.A. 210.00 sep 0.4 mag 3.06,5.24 Sp B0.5III dist. 213.68 pc (697.02 l.y.)
 
 
Coord 2000 16212-2536 Discov num BLM   4 Comp Aa,Ab Coord arcsec 2000 16 21 11.32 -25 35 33.9
Date first 1976 Date last 2023 Obs 30
Pa first 292 Pa last 209.8 P.A. Now (θ) 209.8°
Sep first 0.3 Sep last 0.363 Sep. Now (ρ) 0.363"
Mag pri 3.06 Mag sec 5.24 delta mag (ΔM) 2.18 Spectral class B0.5III (blue-white)
Pri motion ra -011 Sec motion ra
Pri motion dec -016 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
16212-2536 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 184336 16 21 11 -25 35 34 NOR 1 Aa1,2 2010 1 89 0.0 3.30 4.10 0.80 Y
Show 184336 16 21 11 -25 35 34 BLM 4 Aa,Ab 2023 30 210 0.4 3.06 5.24 2.18 <===
Show Alniyat 184336 16 21 11 -25 35 34 H 4 121 AB 2019 46 269 20.5 2.89 8.42 5.53
Quadruple system
2 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Scorpius SAO 184336 HIP 80112 Tycho2 6798-00540-1
Gaia DR2 6048602103659567488 HD 147165 HR 6084 GC 21982
ADS 10009 CD CD-2511485 CP CP-25 5785 Bayer Sigma Scorpii
Bayer name Sig Sco Flamsteed 20 Scorpii Flamsteed name 20 Sco FK5 607
Distance 213.68 Distance ly 697.02 Bayer greek σ Sco
 
 
WDS 16212-2536 BLM 4 Aa,Ab : NOTES
 
 
discov_num notes refcode
BLM 4 A: sig Sco = 20 Sco = Alniyat. This system is comprised of a 33d SB
components Aa1 and Aa2), with a third component (Ab) at 0.4" from the
spectroscopic pair and a fourth component at about 20". The primary
is a beta Cep variable.
North et al. derive masses of 18.4 +/- 5.4 and 11.9 +/- 3.1 Msun for Nor2007
the two spectroscopic components; spectral types for the primary and
secondary appear to be B1III and B1V, and the age is about 10Myr.
1976.471: These measurements cannot be that of the SB system observed
by Struve et al. (1961 ApJ, 133, 509) but probably relates to the more
distant companion observed by Nather et al (1974) at a lunar Chu1974
occultation. The system is also a photometric variable. BLM1978
sig Sco Aa1,Aa2: Malkov et al. (2012) derive dynamical, photometric, and
spectroscopic masses 56.66 +/- 21.97, 15.64, 16.98 Msun, respectively. Mlk2012
H 4 121 H IV 121.
 
 
REFERENCES
 
 
refcode metd author reference
BLM1978 S j Morgan, B.L., Beddoes, D.R., Scaddan, R.J. & Dainty, J.C. 1978MNRAS.183..701M
BLM1978 MNRAS 183, 701, 1978
Chu1974 O j Nather, R., Churms, J., & Wild, P. 1974PASP...86..116N
Chu1974 PASP 86, 116, 1974
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Nor2007 orb j North, J.R., Davis, J., Tuthill, P.G., Tango, W.J., & Robertson, J.G. 2007MNRAS.380.1276N
Nor2007 +Ks MNRAS 380, 1276, 2007
 
 
DISCOVERER
 
 
discov author
BLM Morgan, B.L., Beddoes, D.R., Scaddan, R.J. & Dainty, J.C.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr dm_number notes coord_arcsec_2000
16212-2536 BLM 4 Aa,Ab 2000 22 244 0.5 3.06 5.24 B1 -2511485 N D 162111.32-253533.9
16212-2536 BLM 4 Aa,Ab 2016 23 225 0.5 3.06 5.24 B0.5III -2511485 N 162111.32-253533.9
16212-2536 BLM 4 Aa,Ab 2017 24 220 0.4 3.06 5.24 B0.5III -2511485 N 162111.32-253533.9
16212-2536 BLM 4 Aa,Ab 2019 26 217 0.4 3.06 5.24 B0.5III -2511485 N 162111.32-253533.9
16212-2536 BLM 4 Aa,Ab 2022 29 211 0.4 3.06 5.24 B0.5III -2511485 N 162111.32-253533.9
16212-2536 BLM 4 Aa,Ab 2023 30 210 0.4 3.06 5.24 B0.5III -2511485 N 162111.32-253533.9

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

 
 
WDS 16212-2536 BLM 4 Aa,Ab : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 16212-2536 BLM 4 Aa,Ab : MEASURES
 
 
No records found.

 
 
WDS 16212-2536 : VIRTUAL EYEPIECE
 
 

16212-2536 H 4 121A mag 2.89 Sp B0III 16212-2536 NOR 1Aa2 mag 4.1 Sp B7 16212-2536 BLM 4Ab sep 0.4 P.A. 209.80 mag 5.24 16212-2536 H 4 121B sep 20.5 P.A. 269.00 mag 8.42 Sp B8V 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 16212-2536 : ALADIN DSS IMAGE @ 16h 21m 11.32s -25° 35' 33.9"
 
 
 
 
WDS 16212-2536 BLM 4 Aa,Ab : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

16212-2536 BLM 4Aa,Ab distance=1' 16212-2536 H 4 121AB (Alniyat) distance=1' 16212-2536 NOR 1Aa1,2 (Alniyat) distance=1' 16201-2526 USD1310BC distance=18' 16192-2551 USD1266 distance=31' 16237-2548 RST3019 distance=37' 16186-2518 LUH 2 distance=40' 16240-2525 TOK 773 distance=41' 16243-2545 USD1454Aa,Ab distance=43' 16243-2545 USD1454AB distance=43' 16188-2610 REP 34 distance=47' 16250-2521 HDS2320 distance=54' 16238-2616 LAF 134 distance=54' 16244-2502 B 308AB distance=55' 16244-2502 KOU 62AC distance=55' 16234-2622 RSS 404DF distance=56' 16234-2622 CVN 98DG distance=56' 16234-2622 CVN 98DH distance=56' 16234-2622 CVN 98DI distance=56' 16234-2622 CVN 98DJ distance=56' 16234-2622 CVN 98DK distance=56' 16234-2622 CVN 98DL distance=56' 16234-2622 CVN 98DM distance=56' 16241-2457 TOK 775 distance=56' 16183-2619 BOY 22 distance=59' 16253-2512 RAT 1AB distance=60' 16253-2512 SFR 4Ba,Bb distance=60' 16168-2552 KOU 60 distance=61' 16250-2500 REP 36 distance=64' 16167-2514 B 2806DG distance=65' 16250-2456 KRS 5Aa,Ab distance=66' 16250-2456 REP 35AB distance=66' 16188-2633 REP 33 distance=66' 16163-2542 USD1141 distance=67' 16175-2451 TOK 769 distance=67' 16228-2431 USD1423 distance=68' 16207-2426 KSA 100 distance=71' 16263-2521 REP 38 distance=71' 16256-2614 ELP 36 distance=72' 16265-2527 RAT 6 distance=72' 16164-2503 HDS2300CF distance=73' 16204-2423 LDS 557 distance=73' 16161-2507 LDS4658 distance=74' 16164-2459 KOU 59AB distance=75' 16223-2422 HDS2312 distance=76' 16218-2651 UC 3158 distance=76' 16175-2439 USD1201 distance=76' 16173-2437 WAJ 1 distance=79' 16153-2540 USD1093 distance=80' 16251-2432 TOK 777 distance=83' 16149-2544 UC 3142 distance=85' 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 16212-2536 BLM 4 Aa,Ab 210 0.4 1
Show Alniyat 16212-2536 H 4 121 AB 269 20.5 1
Show Alniyat 16212-2536 NOR 1 Aa1,2 89 0.0 1
Show 16201-2526 USD1310 BC 94 0.1 18
Show 16192-2551 USD1266 175 1.3 31
Show 16237-2548 RST3019 6 0.8 37
Show 16186-2518 LUH 2 225 0.9 40
Show 16240-2525 TOK 773 8 2.1 41
Show 16243-2545 USD1454 Aa,Ab 74 0.5 43
Show 16243-2545 USD1454 AB 50 11.4 43
Show 16188-2610 REP 34 131 2.9 47
Show 16250-2521 HDS2320 170 0.4 54
Show 16238-2616 LAF 134 273 11.3 54
Show 16244-2502 B 308 AB 142 2.7 55
Show 16244-2502 KOU 62 AC 31 9.4 55
Show 16234-2622 RSS 404 DF 227 9.3 56
Show 16234-2622 CVN 98 DG 184 2.7 56
Show 16234-2622 CVN 98 DH 257 3.4 56
Show 16234-2622 CVN 98 DI 143 7.4 56
Show 16234-2622 CVN 98 DJ 34 2.1 56
Show 16234-2622 CVN 98 DK 291 2.2 56
Show 16234-2622 CVN 98 DL 95 6.2 56
Show 16234-2622 CVN 98 DM 299 8.6 56
Show 16241-2457 TOK 775 68 0.2 56
Show 16183-2619 BOY 22 192 0.1 59
Show 16253-2512 RAT 1 AB 76 0.2 60
Show 16253-2512 SFR 4 Ba,Bb 164 0.0 60
Show 16168-2552 KOU 60 314 3.7 61
Show 16250-2500 REP 36 262 1.5 64
Show 16167-2514 B 2806 DG 35 12.6 65
Show 16250-2456 KRS 5 Aa,Ab 14 0.1 66
Show 16250-2456 REP 35 AB 79 1.1 66
Show 16188-2633 REP 33 160 0.6 66
Show 16163-2542 USD1141 310 1.3 67
Show 16175-2451 TOK 769 309 0.4 67
Show 16228-2431 USD1423 320 0.6 68
Show 16207-2426 KSA 100 164 26.5 71
Show 16263-2521 REP 38 26 1.1 71
Show 16256-2614 ELP 36 23 0.9 72
Show 16265-2527 RAT 6 9 1.8 72
Show 16164-2503 HDS2300 CF 177 13.9 73
Show 16204-2423 LDS 557 43 12.0 73
Show 16161-2507 LDS4658 186 51.3 74
Show 16164-2459 KOU 59 AB 119 0.9 75
Show 16223-2422 HDS2312 239 0.3 76
Show 16218-2651 UC 3158 216 78.6 76
Show 16175-2439 USD1201 62 3.9 76
Show 16173-2437 WAJ 1 99 0.1 79
Show 16153-2540 USD1093 306 0.1 80
Show 16251-2432 TOK 777 103 0.3 83
Show 16149-2544 UC 3142 351 44.6 85

 
 
WDS 16212-2536 : COMPONENTS
 
 
  A Aa2 Ab
Aa2 pa=88.5°
sep=0.00"
 
Ab pa=209.8°
sep=0.36"
pa=210.2°
sep=0.36"
 
B pa=269.0°
sep=20.48"
pa=269.0°
sep=20.48"
pa=269.9°
sep=20.30"
 
 
16212-2536 A
 
 
Common name Alniyat Meaning support / shield of the heart Other names Al Niyat Coord arcsec 2000 162111.32-253533.9
Mag 2.89 Spectral class B0III (blue-white) PmRA -10.00 PmDE -21.0
HIP 80112 Tycho2 6798-00540-1 HD 147165 HR 6084
GC 21982 CD CD-2511485 CP CP-25 5785 Bayer Sigma Scorpii
Bayer name Sig Sco Flamsteed 20 Scorpii Flamsteed name 20 Sco FK5 607
Tycho2
Tycho2 6798-00540-1 Pflag RAmdeg 245.29713575 DEmdeg -25.59280657
PmRA -9.9 PmDE -21.1 E RAmdeg 3 E DEmdeg 3
E pmRA 0.4 E pmDE 0.5 EpRAm 1991.07 EpDEm 1990.71
Num 30 Q RAmdeg 1.3 Q DEmdeg 2.0 Q pmRA 1.5
Q pmDE 1.6 BTmag 3.024 E BTmag 0.014 VTmag 2.911
E VTmag 0.009 Prox 999 TYC T HIP 80112
CCDM AC RAdeg 245.29716139 DEdeg -25.59275556 EpRA 1990 1.71
EpDE 1990 1.30 E RAdeg 3.2 E DEdeg 3.4 Posflg P
Corr 0.2
Hipparcos
Catalog H HIP 80112 Proxy H RAhms 16 21 11.32
DEdms -25 35 33.9 Vmag 2.9 VarFlag 1 R Vmag G
RAdeg 245.297 DEdeg -25.5928 AstroRef A Plx 4.44
CCDM -10.03 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AC
Theta 258 Rho 0.428 HD BD
CD CD-2511485 CP CP-25 5785 Dm number -2511485 VIred 0.31
SpType B1III R SpType Coord arcsec 2000 162111.32-253533.9
Hipparcos 2
HIP 80112 Sn 15 So 3 Nc 2
RArad 4.281243391 DErad -0.4466777959 Plx 4.68 PmRA -10.6
PmDE -16.28 E RArad 0.58 E DErad 0.35 E Plx 0.6
E pmRA 0.78 E pmDE 0.43 Hpmag E Hpmag 0.0026
SHp 0.024 VA 1 BV 0.299 E BV 0.003
VI 0.31
CCDM
Ccdm 16212-2536 RComp Comp A Note1
Note2 Discov num DRAs -0.69 DDEs 25.9
R dRAs 82 Year Theta Rho
Obs 3 Vmag 3.1 Sp B1 PmNote *
PmRA -10 PmDE -18 Dm number -2511485 Cat1 CD
Name2 184336 Cat2 SAO HD 147165 M HD
ADS BDS A10009 M ADS BDS N IDS IDS 16151S2521A
HIC 80112
 
 
16212-2536 Aa2
 
 
Coord arcsec 2000 162111.32-253533.9 Mag 4.1 Spectral class B7 (blue-white) Delta magnitude 0.8
Coordinate calculated yes
 
 
16212-2536 Ab
 
 
Coord arcsec 2000 162111.31-253534.2 Mag 5.24 Delta magnitude 1.94 Coordinate calculated yes
 
 
16212-2536 B
 
 
Coord arcsec 2000 162109.81-253534.3 Mag 8.42 Spectral class B8V (blue-white) Delta magnitude 5.12
Coordinate calculated yes
CCDM
Ccdm 16212-2536 RComp Comp B Note1
Note2 Discov num H 121 DRAs DDEs
R dRAs Year 1959 Theta 273 Rho 20.0
Obs 23 Vmag 8.7 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A10009 M ADS BDS N N IDS IDS 16151S2521B
HIC