20452-3120 LDS 720 BC

 
 
20h 41m 51.16s -32° 26' 06.7" P.A. 128.00 sep 1.8 mag 11.36,11.49 Sp M4Ve dist. 10.7 pc (34.9 l.y.)
 
 
Coord 2000 20452-3120 Discov num LDS 720 Comp BC Coord arcsec 2000 20 41 51.16 -32 26 06.7
Date first 1913 Date last 2020 Obs 27
Pa first 258 Pa last 127.9 P.A. Now (θ) 127.9°
Sep first 2.8 Sep last 1.759 Sep. Now (ρ) 1.759"
Mag pri 11.36 Mag sec 11.49 delta mag (ΔM) 0.13 Spectral class M4Ve (red)
Pri motion ra +269 Sec motion ra +286
Pri motion dec -366 Sec motion dec -377
Notes N O (See Notes, Orbital solution)
rPM=0.043 (< 0.3, Physical double)
This double is physical.
 
 
20452-3120 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show AU Mic 212402 20 45 10 -31 20 27 LDS 720 AB 1999 5 213 999.9 8.93 11.36 2.43
Show 212355 20 41 51 -32 26 07 LDS 720 BC 2020 27 128 1.8 11.36 11.49 0.13 Y <===
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name AT Mic Constellation Microscopium SAO 212355 HIP 102141
Tycho2 7460-00137-1 HD 196982 GL Gl 799A CD CD-3216135
Distance 10.7 Distance ly 34.9
 
 
ORBITAL ELEMENTS
 
 
Period (P)141.39y Periastron (T)2035.1y Semi-major axis (a)2.616a
Eccentricity (e)0.607 Inclination (i)148.4° Longitude of periastron (ω)54.6°
Node (Ω)82.6° Notesn ReferenceHrt2014b
Equinox2000 Last observation2012 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 176.5 2.898
2001 175.0 2.856
2002 173.6 2.813
2003 172.1 2.770
2004 170.5 2.725
2005 168.9 2.680
2006 167.2 2.633
2007 165.5 2.586
2008 163.7 2.538
2009 161.8 2.490
2010 159.9 2.440
2011 157.8 2.390
2012 155.7 2.339
2013 153.5 2.286
2014 151.2 2.234
2015 148.8 2.180
2016 146.3 2.125
2017 143.6 2.070
2018 140.7 2.014
2019 137.8 1.957
2020 134.6 1.899
2021 131.2 1.840
2022 127.6 1.780
2023 123.7 1.718
2024 119.6 1.656
2025 115.1 1.593
2026 110.3 1.528
2027 105.0 1.461
2028 99.2 1.393
2029 92.8 1.323
2030 85.7 1.251


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



 
 


wds20452-3120a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS 20452-3120 LDS 720 BC : NOTES
 
 
discov_num notes refcode
LDS 720 AB: Distance 4600". A is the BY Dra-type variable AU Mic, also nearby
star Gliese 803. High common proper motion pair.
AB: SHY 99. Bayesian analysis by Shaya & Olling (2011) indicates very Shy2011
high (near 100%) probability pair is physical.
BC: Due to its large distance from A, the WDS designation for BC was
originally 20419-3226. Also known as BRT1812 or HDS2953 and as nearby
star Gliese 799 AB. Discovered by Barton in 1913 but later incorrectly Brt1936a
called Luyten by Voute, the BC pair became known as LDS 720 despite Vou1947a
having never been observed by Luyten. See also the following note for
20452-3122WOR 40.
GJ 799. Member of the bet Pic moving group. Zuc2001b
BC: Premature orbits have been computed. A flare star, AT Mic, sharing
common proper motion with -32@16135 at 34@, 77.5'.
Measure of 1927.70 made by triangulation of multiple measures.
Measure of 1928.57 made by triangulation of multiple measures.
Star A (mag 8.6, M0Ve) 1.3 deg distant; position 204509.5-312027
(2000) shares the large proper motion. Star C is the flare star
AT Mic.
See Baize & Petit (1989) catalog of doubles with variable component. Baz1989d
 
 
REFERENCES
 
 
refcode metd author reference
Baz1989d - Baize, P. & Petit, M. 1989A&AS...77..497B
Baz1989d A&AS 77, 497, 1989
Brt1936a Ma - Barton, S.G. 1936AJ.....45...33B
Brt1936a +Pa AJ 45, 33, 1936
Hrt2014b orb - Hartkopf, W.I. & Mason, B.D. 2014IAUDS.184....1H
Hrt2014b Inf. Circ. 184, 1, 2014
Shy2011 - Shaya, E.J. & Olling, R. 2011ApJS..192....2S
Shy2011 ApJS 192, 2, 2011
Shy2011 (Statistical analysis of probability that wide Hipparcos pairs are physical. Pairs
Shy2011 added to WDS only if probability 90% or greater.)
Vou1947a Ma j Voute, J.G., Terkule, Strand, K., van den Bos, W., Wallenquist, A., van Dissel, 1947AnBos...6....3V
Vou1947a +Po Janssen, & Witlox
Vou1947a Ann. Bosscha Obs. Lembang 6, Pt.3, C1, 1947
Zuc2001b - Zuckerman, B., Song, I., Bessell, M.S., & Webb, R.A. 2001ApJ...562L..87Z
Zuc2001b ApJ 562, L87, 2001
 
 
DISCOVERER
 
 
idgroup discov author
1 LDS Luyten p.m. catalog (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
20452-3120 LDS 720 BC 1991 16 186 3.2 11.36 11.49 Mpe NO 204151.16-322606.7
20452-3120 LDS 720 BC 2010 18 338 2.4 11.36 11.49 Mpe NO 204151.16-322606.7
20452-3120 LDS 720 BC 2012 20 153 2.3 11.36 11.49 Mpe NO 204151.16-322606.7
20452-3120 LDS 720 BC 2014 24 148 2.2 11.36 11.49 M4Ve NO 204151.16-322606.7
20452-3120 LDS 720 BC 2015 26 146 2.1 11.36 11.49 M4Ve NO 204151.16-322606.7
20452-3120 LDS 720 BC 2020 27 128 1.8 11.36 11.49 M4Ve NO 204151.16-322606.7

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

 
 
WDS 20452-3120 LDS 720 BC : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20452-3120 LDS 720 BC : MEASURES
 
 
No records found.

 
 
WDS 20452-3120 : VIRTUAL EYEPIECE
 
 

20452-3120 LDS 720A mag 8.93 Sp M1Ve 20452-3120 LDS 720B sep 4680.0 P.A. 212.80 mag 11.36 Sp M4Ve 20452-3120 LDS 720C sep 4680.3 P.A. 212.80 mag 11.49 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 20452-3120 : ALADIN DSS IMAGE @ 20h 41m 51.16s -32° 26' 06.7"
 
 
 
 
WDS 20452-3120 LDS 720 BC : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only


20452-3120  LDS 720BC distance=0' 20404-3251  SHY 781 distance=31' 20431-3305  UC 4268 distance=42' 20451-3221  KPP3118Aa,Ab distance=42' 20451-3221  LDS5910 distance=42' 20440-3147  JSP 816 distance=48' 20392-3304  RST2148 distance=52' 20379-3248  BRT1810 distance=56' 20411-3327  B   993BC distance=61' 20411-3327  SEE 424A,BC distance=62' 20467-3245  RST2160 distance=64' 20374-3312  SKF2088 distance=74' 20452-3122  WOR  40 distance=77' 20452-3120  LDS 720AB distance=78' 20366-3308  RST2146 distance=79' 20478-3255  WIS 343 distance=81' 20380-3122  B   992 distance=81' 20362-3301  LDS 715 distance=82' 20448-3112  TDT2516 distance=83' 20452-3057  JSP 817CD distance=92' 20467-3336  HDS2960AB distance=93' 20467-3336  SKF2090AC distance=93' 20372-3114  HDS2943 distance=94' 20479-3132  B   995 distance=94' 20347-3152  RST2145 distance=98' 20452-3057  FAL  70AB distance=99' 20452-3057  TOK 340AC distance=99' 20353-3126  LDS5908 distance=103' 20485-3126  B   996 distance=104' 20337-3255  TDT2374 distance=107' 20351-3330  BRT1809 distance=107' 20345-3131  KPP1926 distance=109' 20338-3313  RSS 552 distance=113' 20329-3227  UC 4214 distance=113' 20501-3315  UC 4305 distance=115' 20424-3031  H N 101AB distance=116' 20510-3256  RST2162 distance=119' 20348-3355  HJ 5207 distance=126' 20454-3029  HJ 5218 distance=126' 20365-3413  RST3264 distance=127' 20517-3303  UC 4311 distance=130' 20500-3347  HJ 5224 distance=131' 20330-3336  TDT2362 distance=132' 20412-3015  RST2152 distance=132' 20327-3123  HJ 5206 distance=133' 20507-3116  B   997 distance=133' 20431-3010  UC 4267 distance=137' 20516-3123  KPP2645 distance=140' 20503-3058  LDS5911 distance=140' 20529-3245  B  1000 distance=142' 20434-3005  LDS5909 distance=142' 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 20452-3120 LDS 720 BC 128 1.8
Show 20404-3251 SHY 781 310 999.9 31
Show 20431-3305 UC 4268 40.3 42
Show 20451-3221 KPP3118 Aa,Ab 16 1.6 42
Show 20451-3221 LDS5910 355 283.9 42
Show 20440-3147 JSP 816 132 3.3 48
Show 20392-3304 RST2148 31 1.1 52
Show 20379-3248 BRT1810 204 7.3 56
Show 20411-3327 B 993 BC 40 0.4 61
Show 20411-3327 SEE 424 A,BC 335 11.2 62
Show 20467-3245 RST2160 138 0.5 64
Show 20374-3312 SKF2088 135 13.2 74
Show 20452-3122 WOR 40 168 4.8 77
Show 20452-3120 LDS 720 AB 213 999.9 78
Show 20366-3308 RST2146 245 1.9 79
Show 20478-3255 WIS 343 9 525.5 81
Show 20380-3122 B 992 247 1.3 81
Show 20362-3301 LDS 715 144 91.8 82
Show 20448-3112 TDT2516 60 0.6 83
Show 20452-3057 JSP 817 CD 75 2.2 92
Show 20467-3336 HDS2960 AB 158 0.2 93
Show 20467-3336 SKF2090 AC 190 88.1 93
Show 20372-3114 HDS2943 75 2.1 94
Show 20479-3132 B 995 288 0.5 94
Show 20347-3152 RST2145 255 0.1 98
Show 20452-3057 FAL 70 AB 76 17.5 99
Show 20452-3057 TOK 340 AC 235 539.4 99
Show 20353-3126 LDS5908 124 248.3 103
Show 20485-3126 B 996 321 1.6 104
Show 20337-3255 TDT2374 131 3.0 107
Show 20351-3330 BRT1809 154 3.0 107
Show 20345-3131 KPP1926 56 15.1 109
Show 20338-3313 RSS 552 29 6.7 113
Show 20329-3227 UC 4214 142 15.2 113
Show 20501-3315 UC 4305 302 143.4 115
Show 20424-3031 H N 101 AB 334 25.9 116
Show 20510-3256 RST2162 76 0.8 119
Show 20348-3355 HJ 5207 257 10.5 126
Show 20454-3029 HJ 5218 190 9.8 126
Show 20365-3413 RST3264 99 2.7 127
Show 20517-3303 UC 4311 335 26.1 130
Show 20500-3347 HJ 5224 165 20.2 131
Show 20330-3336 TDT2362 146 0.5 132
Show 20412-3015 RST2152 335 0.9 132
Show 20327-3123 HJ 5206 192 16.4 133
Show 20507-3116 B 997 273 0.2 133
Show 20431-3010 UC 4267 59 8.2 137
Show 20516-3123 KPP2645 163 24.7 140
Show 20503-3058 LDS5911 78 118.0 140
Show 20529-3245 B 1000 312 3.6 142
Show 20434-3005 LDS5909 146 10.6 142

 
 
WDS 20452-3120 : COMPONENTS
 
 
  A B
B pa=212.8°
sep=4679.99"
 
C pa=212.8°
sep=4680.27"
pa=132.7°
sep=1.59"
 
 
20452-3120 A
 
 
Var name AU Mic Coord arcsec 2000 204509.53-312027.2 Mag 8.93 Spectral class M1Ve (red)
PmRA 288.00 PmDE -359.0 SAO 212402 HIP 102409
Tycho2 7457-00641-1 HD 197481 CD CD-3117815 CP CP-31 6335
Tycho2
Tycho2 7457-00641-1 Pflag RAmdeg 311.28970675 DEmdeg -31.34090034
PmRA 278.8 PmDE -360.0 E RAmdeg 12 E DEmdeg 14
E pmRA 1.6 E pmDE 1.6 EpRAm 1990.42 EpDEm 1989.58
Num 10 Q RAmdeg 0.8 Q DEmdeg 0.6 Q pmRA 0.8
Q pmDE 0.6 BTmag 10.665 E BTmag 0.045 VTmag 8.927
E VTmag 0.017 Prox 999 TYC T HIP 102409
CCDM RAdeg 311.28895528 DEdeg -31.34003611 EpRA 1990 1.71
EpDE 1990 1.37 E RAdeg 11.7 E DEdeg 15.2 Posflg
Corr -0.1
SAO
SAO 212402 DelFlag RA1950 PmRA1950 0.0212
DE1950 PmDE1950 -0.348 Vmag 8.4 SpType K5
Double code Source 40 CatNum 11323 DM CD-3117815
DMcomp BDsup HD 197481 M HD 0
GC RA1950rad 5.41952045 DE1950rad -0.55009526 PmRA2000 0.0212
PmDE2000 -0.349
Hipparcos
Catalog H HIP 102409 Proxy RAhms 20 45 09.34
DEdms -31 20 24.1 Vmag 8.81 VarFlag 2 R Vmag G
RAdeg 311.289 DEdeg -31.34 AstroRef Plx 100.59
CCDM 20451-3122 N CCDM I Nsys 2 Ncomp 1
MultFlag Source Qual M HIP
Theta Rho HD 197481 BD
CD CD-3117815 CP CP-31 6335 Dm number -3117815 VIred 2.1
SpType M1Ve R SpType Coord arcsec 2000 204509.34-312024.1
Hipparcos 2
HIP 102409 Sn 5 So 0 Nc 1
RArad 5.43301654 DErad -0.5469866103 Plx 100.91 PmRA 279.96
PmDE -360.61 E RArad 0.95 E DErad 0.58 E Plx 1.06
E pmRA 1.26 E pmDE 0.73 Hpmag 8.762 E Hpmag 0.0052
SHp 0.036 VA 1 BV 1.47 E BV 0.29
VI 2.1
 
 
20452-3120 B
 
 
Coord arcsec 2000 204151.16-322606.7 Coord calc 204151.16-322606.7 Mag 11.36 Spectral class M4Ve (red)
PmRA 269.00 PmDE -366.0 SAO 212355 HIP 102141
Tycho2 7460-00137-1 HD 196982 CD CD-3216135 Calc delta mag 2.43
Tycho2
Tycho2 7460-00137-1 Pflag RAmdeg 310.46314082 DEmdeg -32.43520264
PmRA 261.3 PmDE -344.8 E RAmdeg 68 E DEmdeg 104
E pmRA 3.6 E pmDE 3.9 EpRAm 1985.51 EpDEm 1977.70
Num 3 Q RAmdeg 3.5 Q DEmdeg 0.9 Q pmRA 3.5
Q pmDE 0.9 BTmag 12.666 E BTmag 0.308 VTmag 11.361
E VTmag 0.129 Prox 32 TYC HIP 102141
CCDM B RAdeg 310.46243694 DEdeg -32.43436722 EpRA 1990 1.70
EpDE 1990 1.22 E RAdeg 71.8 E DEdeg 117.7 Posflg
Corr -0.1
SAO
SAO 212355 DelFlag RA1950 PmRA1950 0.0216
DE1950 PmDE1950 -0.331 Vmag 10 SpType Pec
Double code Source 40 CatNum 11295 DM CD-3216135
DMcomp BDsup HD 196982 M HD 0
GC RA1950rad 5.40497091 DE1950rad -0.56914799 PmRA2000 0.0216
PmDE2000 -0.332
Hipparcos
Catalog H HIP 102141 Proxy H RAhms 20 41 50.97
DEdms -32 26 03.6 Vmag 10.27 VarFlag R Vmag G
RAdeg 310.462 DEdeg -32.4343 AstroRef B Plx 97.8
CCDM 20451-3122 N CCDM I Nsys 2 Ncomp 2
MultFlag C Source Qual D M HIP BC
Theta 187 Rho 3.349 HD 196982 BD
CD CD-3216135 CP Dm number -3216135 VIred 2.9
SpType Mpe R SpType Coord arcsec 2000 204150.97-322603.6
Hipparcos 2
HIP 102141 Sn 15 So 3 Nc 2
RArad 5.4185908165 DErad -0.5660860496 Plx 93.5 PmRA 270.45
PmDE -365.6 E RArad 3.37 E DErad 2.37 E Plx 3.67
E pmRA 4.63 E pmDE 3.5 Hpmag 10.1659 E Hpmag 0.0041
SHp 0.031 VA 0 BV 1.55 E BV 0.02
VI 2.9
 
 
20452-3120 C
 
 
Coord arcsec 2000 204151.25-322607.8 Mag 11.49 PmRA 286.00 PmDE -377.0
HIP 102141 Tycho2 7460-00137-2 CD CD-3216135 Calc delta mag 2.56
Calc coord yes
Tycho2
Tycho2 7460-00137-2 Pflag RAmdeg 310.46311235 DEmdeg -32.43617265
PmRA 286.2 PmDE -377.2 E RAmdeg 79 E DEmdeg 123
E pmRA 4.0 E pmDE 4.2 EpRAm 1986.25 EpDEm 1977.87
Num 2 Q RAmdeg Q DEmdeg Q pmRA
Q pmDE BTmag 13.028 E BTmag 0.388 VTmag 11.491
E VTmag 0.146 Prox 32 TYC HIP 102141
CCDM C RAdeg 310.46233056 DEdeg -32.43525167 EpRA 1990 1.70
EpDE 1990 1.21 E RAdeg 81.9 E DEdeg 135.4 Posflg
Corr -0.1
Hipparcos
Catalog H HIP 102141 Proxy H RAhms 20 41 50.97
DEdms -32 26 03.6 Vmag 10.27 VarFlag R Vmag G
RAdeg 310.462 DEdeg -32.4343 AstroRef B Plx 97.8
CCDM 20451-3122 N CCDM I Nsys 2 Ncomp 2
MultFlag C Source Qual D M HIP BC
Theta 187 Rho 3.349 HD 196982 BD
CD CD-3216135 CP Dm number -3216135 VIred 2.9
SpType Mpe R SpType Coord arcsec 2000 204150.97-322603.6
Hipparcos 2
HIP 102141 Sn 15 So 3 Nc 2
RArad 5.4185908165 DErad -0.5660860496 Plx 93.5 PmRA 270.45
PmDE -365.6 E RArad 3.37 E DErad 2.37 E Plx 3.67
E pmRA 4.63 E pmDE 3.5 Hpmag 10.1659 E Hpmag 0.0041
SHp 0.031 VA 0 BV 1.55 E BV 0.02
VI 2.9