09278-0604 B 2530 (HD 81809)

 
 
09h 27m 46.78s -06° 04' 16.4" P.A. 143.00 sep 0.3 mag 5.63,7.52 Sp G2V dist. 30.41 pc (99.2 l.y.)
 
 
Coord 2000 09278-0604 Discov num B  2530 Comp Coord arcsec 2000 09 27 46.78 -06 04 16.4
Date first 1938 Date last 2021 Obs 77
Pa first 319 Pa last 143.2 P.A. Now (θ) 145.9°
Sep first 0.2 Sep last 0.259 Sep. Now (ρ) 0.357"
Mag pri 5.63 Mag sec 7.52 delta mag (ΔM) 1.89 Spectral class G2V (yellow)
Pri motion ra -227 Sec motion ra -227
Pri motion dec -077 Sec motion dec -077
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 81809 Constellation Hydra SAO 136872 HIP 46404
Tycho2 4893-01379-1 Gaia DR2 5745464991235898752 HD 81809 HR 3750
GC 13048 GL Gl 344A BD BD-05 2802 Distance 30.41
Distance ly 99.2
 
 
ORBITAL ELEMENTS
 
 
Period (P)34.8y± 0.06 Periastron (T)2010.11y± 0.1 Semi-major axis (a)0.428a± 0.001
Eccentricity (e)0.27± 0.003 Inclination (i)85.4°± 0.1 Longitude of periastron (ω)341.9°± 1.1
Node (Ω)330.8°± 0.1 Notesn ReferenceTok2015c
Equinox2000 Last observation2014 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 153.5 0.415
2001 154.5 0.363
2002 155.8 0.302
2003 157.9 0.233
2004 161.9 0.156
2005 174.3 0.076
2006 271.2 0.034
2007 316.4 0.106
2008 323.9 0.183
2009 327.1 0.248
2010 329.1 0.293
2011 330.7 0.315
2012 332.1 0.312
2013 333.8 0.285
2014 335.9 0.240
2015 339.2 0.183
2016 346.0 0.117
2017 10.0 0.053
2018 103.1 0.048
2019 131.8 0.111
2020 139.2 0.178
2021 142.6 0.243
2022 144.6 0.303
2023 145.9 0.357
2024 146.9 0.405
2025 147.7 0.447
2026 148.4 0.480
2027 149.0 0.507
2028 149.6 0.525
2029 150.1 0.535
2030 150.6 0.536


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



 
 


wds09278-0604c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS 09278-0604 B 2530 (HD 81809) : NOTES
 
 
discov_num notes refcode
B 2530 There may have been a quadrant reversal about 1951. The 3-year
spectroscopic motion does not seem to relate to the visual pair.
Giant primary according to isochrone fit. Sod1999
Single line SB, P = 2.5 y, also a known visual binary. Primary is G2V,
so companion should likely be a cooler dwarf; this seems to be
confirmed from magnitude differences observed at 750, 550, and 450nm. Bag1984b
Pourbaix gives combined solution for this resolved SB2, yielding
orbital parallaxes and component masses. Pbx2000b
Malkov et al. (2012) derive dynamical, photometric, and spectroscopic
masses of 2.06 +/- 0.31, 2.44, and 1.00 Msun, respectively. Mlk2012
 
 
REFERENCES
 
 
refcode metd author reference
Bag1984b S j Balega, Y.Y., Bonneau, D., & Foy, R 1984A&AS...57...31B
Bag1984b A&AS 57, 31, 1984
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Pbx2000b orb - Pourbaix, D. 2000A&AS..145..215P
Pbx2000b A&AS 145, 215, 2000
Sod1999 orb - Soderhjelm, S. 1999A&A...341..121S
Sod1999 A&A 341, 121, 1999
Tok2015c orb+j Tokovinin, A., Mason, B.D., Hartkopf, W.I., Mendez, R.A., & Horch, E.P. 2015AJ....150...50T
Tok2015c +St AJ 150, 50, 2015 (some measures corrected in Tok2017b) 2017AJ....154..110T
 
 
DISCOVERER
 
 
idgroup discov author
1 B van den Bos, W.H.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
09278-0604 B 2530 1999 64 153 0.4 5.63 7.52 G2V NOD 092746.78-060416.4
09278-0604 B 2530 2009 65 327 0.3 5.63 7.52 G2V NOD 092746.78-060416.4
09278-0604 B 2530 2011 67 330 0.3 5.63 7.52 G2V NOD 092746.78-060416.4
09278-0604 B 2530 2013 68 334 0.3 5.63 7.52 G2V NOD 092746.78-060416.4
09278-0604 B 2530 2014 70 336 0.2 5.63 7.52 G2V NO 092746.78-060416.4
09278-0604 B 2530 2017 73 35 0.0 5.63 7.52 G2V NO 092746.78-060416.4
09278-0604 B 2530 2018 75 117 0.1 5.63 7.52 G2V NO 092746.78-060416.4
09278-0604 B 2530 2019 76 135 0.1 5.63 7.52 G2V NO 092746.78-060416.4
09278-0604 B 2530 2021 77 143 0.3 5.63 7.52 G2V NO 092746.78-060416.4

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

 
 
WDS 09278-0604 B 2530 (HD 81809) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 09278-0604 B 2530 (HD 81809) : MEASURES
 
 
No records found.

 
 
WDS 09278-0604 (HD 81809) : VIRTUAL EYEPIECE
 
 

09278-0604 B  2530A mag 5.63 Sp G2V 09278-0604 B  2530B sep 0.3 P.A. 143.40 mag 7.52 virtual eyepiece
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Radius:
Components only
 
 
WDS 09278-0604 (HD 81809) : ALADIN DSS IMAGE @ 09h 27m 46.78s -06° 04' 16.4"
 
 
 
 
WDS 09278-0604 B 2530 (HD 81809) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only


09278-0604  B  2530 distance=0' 09255-0557  KPP 586 distance=35' 09302-0600  HDS1365 distance=36' 09261-0641  SKF 787 distance=45' 09240-0532  HJ 2496 distance=65' 09322-0550  DAM1641 distance=68' 09323-0546  RST4437 distance=70' 09325-0542  DAM1642 distance=74' 09288-0722  GIC  87 distance=80' 09334-0557  RST4913 distance=85' 09228-0516  UC 1782 distance=89' 09234-0503  GIC  85 distance=90' 09290-0733  RST3639 distance=91' 09308-0723  LDS3901 distance=91' 09321-0455  BRT 429 distance=94' 09244-0725  HEI 352 distance=95' 09289-0428  LDS3897 distance=98' 09331-0707  RST3643 distance=101' 09300-0741  UC 1804 distance=102' 09336-0704  DAM1651 distance=105' 09225-0454  GWP1165 distance=106' 09333-0711  CBL 131 distance=107' 09342-0703  RST3646 distance=113' 09230-0735  UC 1784 distance=116' 09293-0409  GIC  88 distance=117' 09283-0805  BU  213 distance=122' 09295-0402  UC 1801 distance=125' 09233-0752  UC 1785 distance=128' 09229-0753  BRT 428 distance=132' 09365-0622  GWP1203 distance=132' 09365-0630  DAM1663 distance=133' 09367-0633  TDS6685 distance=137' 09369-0632  TDS6687 distance=140' 09224-0759  TDS6512 distance=141' 09369-0642  GWP1204 distance=141' 09307-0821  RST3641 distance=144' 09287-0827  SKF 429 distance=144' 09207-0742  A  1082AB distance=145' 09207-0742  BGH   4CA distance=145' 09207-0742  TOK 527CD distance=145' 09214-0415  HJ  132 distance=146' 09362-0725  HJ  818AB distance=150' 09362-0725  GWP1201AC distance=150' 09276-0840  H 6 111AB (Alphard) distance=156' 09276-0840  H 6 111AC (Alphard) distance=156' 09311-0330  KPP2758 distance=162' 09169-0538  HJ  127 distance=163' 09225-0828  A  1083 distance=164' 09170-0531  GWP1155 distance=165' 09167-0621  KUI  40 distance=167' 09185-0733  J  2651 distance=167' grafico limitrofi
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Pass over with the mouse cursor to display the catalog designation.

Show name coord_2000 discov# comp pa sep dist(')
Show 09278-0604 B 2530 143 0.3
Show 09255-0557 KPP 586 13 5.5 35
Show 09302-0600 HDS1365 348 0.5 36
Show 09261-0641 SKF 787 151 11.7 45
Show 09240-0532 HJ 2496 48 19.5 65
Show 09322-0550 DAM1641 173 16.3 68
Show 09323-0546 RST4437 110 0.7 70
Show 09325-0542 DAM1642 89 2.8 74
Show 09288-0722 GIC 87 84 35.6 80
Show 09334-0557 RST4913 20 3.6 85
Show 09228-0516 UC 1782 310 34.0 89
Show 09234-0503 GIC 85 108 13.6 90
Show 09290-0733 RST3639 101 3.1 91
Show 09308-0723 LDS3901 253 32.0 91
Show 09321-0455 BRT 429 167 4.6 94
Show 09244-0725 HEI 352 219 2.6 95
Show 09289-0428 LDS3897 285 70.3 98
Show 09331-0707 RST3643 130 1.2 101
Show 09300-0741 UC 1804 358 22.7 102
Show 09336-0704 DAM1651 328 13.5 105
Show 09225-0454 GWP1165 238 8.2 106
Show 09333-0711 CBL 131 19 57.7 107
Show 09342-0703 RST3646 327 0.6 113
Show 09230-0735 UC 1784 267 23.7 116
Show 09293-0409 GIC 88 169 18.2 117
Show 09283-0805 BU 213 171 1.9 122
Show 09295-0402 UC 1801 196 9.8 125
Show 09233-0752 UC 1785 39 52.8 128
Show 09229-0753 BRT 428 191 4.3 132
Show 09365-0622 GWP1203 110 13.9 132
Show 09365-0630 DAM1663 76 5.9 133
Show 09367-0633 TDS6685 105 0.5 137
Show 09369-0632 TDS6687 94 1.9 140
Show 09224-0759 TDS6512 58 0.5 141
Show 09369-0642 GWP1204 239 76.0 141
Show 09307-0821 RST3641 257 0.4 144
Show 09287-0827 SKF 429 259 17.5 144
Show 09207-0742 A 1082 AB 200 0.6 145
Show 09207-0742 BGH 4 CA 326 135.0 145
Show 09207-0742 TOK 527 CD 342 999.9 145
Show 09214-0415 HJ 132 237 27.1 146
Show 09362-0725 HJ 818 AB 48 11.5 150
Show 09362-0725 GWP1201 AC 207 90.9 150
Show Alphard 09276-0840 H 6 111 AB 155 284.4 156
Show Alphard 09276-0840 H 6 111 AC 85 257.0 156
Show 09311-0330 KPP2758 76 43.8 162
Show 09169-0538 HJ 127 285 12.6 163
Show 09225-0828 A 1083 58 4.4 164
Show 09170-0531 GWP1155 202 17.8 165
Show 09167-0621 KUI 40 287 1.3 167
Show 09185-0733 J 2651 209 3.9 167

 
 
WDS 09278-0604 : COMPONENTS
 
 
  A
B pa=143.4°
sep=0.26"
 
 
09278-0604 A
 
 
Componente originario normalizzato AB Name HD 81809 Coord arcsec 2000 092746.78-060416.4 Mag 5.63
Spectral class G2V (yellow) PmRA -227.00 PmDE -77.0 SAO 136872
HIP 46404 Tycho2 4893-01379-1 HD 81809 HR 3750
GC 13048 BD BD-05 2802
Tycho2
Tycho2 4893-01379-1 Pflag RAmdeg 141.94494627 DEmdeg -6.07123431
PmRA -227.3 PmDE -76.6 E RAmdeg 3 E DEmdeg 4
E pmRA 1.1 E pmDE 1.0 EpRAm 1991.55 EpDEm 1990.98
Num 12 Q RAmdeg 1.3 Q DEmdeg 1.5 Q pmRA 1.5
Q pmDE 1.4 BTmag 6.196 E BTmag 0.014 VTmag 5.483
E VTmag 0.009 Prox 999 TYC T HIP 46404
CCDM AB RAdeg 141.94547472 DEdeg -6.07105000 EpRA 1990 1.68
EpDE 1990 1.35 E RAdeg 3.4 E DEdeg 3.8 Posflg P
Corr 0.3
SAO
SAO 136872 DelFlag RA1950 PmRA1950 -0.0153
DE1950 PmDE1950 -0.079 Vmag 5.4 SpType G0
Double code Source 70 CatNum 13048 DM BD-05 2802
DMcomp BDsup HD 81809 M HD 0
GC 13048 RA1950rad 2.46659681 DE1950rad -0.10213333 PmRA2000 -0.015
PmDE2000 -0.074
Hipparcos
Catalog H HIP 46404 Proxy H RAhms 09 27 46.92
DEdms -06 04 15.7 Vmag 5.38 VarFlag R Vmag G
RAdeg 141.945 DEdeg -6.07103 AstroRef A Plx 32.01
CCDM 09278-0604 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 148 Rho 0.487 HD 81809 BD BD-05 2802
CD CP Dm number -05 2802 VIred 0.73
SpType G2V R SpType Coord arcsec 2000 092746.92-060415.7
Hipparcos 2
HIP 46404 Sn 15 So 3 Nc 2
RArad 2.4774161172 DErad -0.1059594394 Plx 32.88 PmRA -233.71
PmDE -66.17 E RArad 0.73 E DErad 0.47 E Plx 0.77
E pmRA 0.98 E pmDE 0.5 Hpmag 5.5035 E Hpmag 0.0006
SHp 0.005 VA 0 BV 0.642 E BV 0.018
VI 0.73
CCDM
Ccdm 09278-0604 RComp Comp A Note1
Note2 Discov num DRAs -1.19 DDEs -16.0
R dRAs 10 Year Theta Rho
Obs 2 Vmag 6.2 Sp G0 PmNote *
PmRA -227 PmDE -78 Dm number -05 2802 Cat1 BD
Name2 136872 Cat2 SAO HD 81809 M HD
ADS BDS M ADS BDS N IDS IDS 09228S0538A
HIC 46404
 
 
09278-0604 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 092746.79-060416.6 Mag 7.52 PmRA -227.00
PmDE -77.0 Calc delta mag 1.89 Calc coord yes
CCDM
Ccdm 09278-0604 RComp Comp B Note1 *
Note2 Discov num B 2530 DRAs DDEs
R dRAs Year 1960 Theta 153 Rho 0.4
Obs 9 Vmag 7.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N N IDS IDS 09228S0538B
HIC 46404