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Current system
20467+1607
STF 2727 AB
Gam2 Del


Nearby doubles
6' : 20468+1602
BPM2264

9' : 20466+1616
BPM2261

15' : 20462+1554
STF2725AB

18' : 20463+1624
BPM2257

23' : 20481+1601
BPM2269

23' : 20481+1616
SKF1770

31' : 20446+1605
BPM2245

34' : 20485+1628
BPM2271

34' : 20457+1537
BPM2255

35' : 20489+1558
BPM2275

35' : 20485+1545
BPM2272

36' : 20466+1532
J 3110

41' : 20446+1635
BPM2248AB

45' : 20467+1523
BPM2263

46' : 20446+1642
BPM2246AB

46' : 20434+1604
HJ 1564

48' : 20462+1520
YR 27AB

51' : 20501+1556
BPM2278

51' : 20477+1519
BPM2266

52' : 20436+1537
J 3108

52' : 20437+1635
BPM2237

54' : 20435+1540
GWP2990

56' : 20503+1630
LDS1048AB

56' : 20505+1616
KPP4216

57' : 20506+1601
BPM2281

62' : 20448+1512
BPM2253



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.

20467+1607 STF 2727 AB (Gam2 Del)

 
 
20h 46m 39.50s +16° 07' 27.4" P.A. 266.00 sep 8.8 mag 4.36,5.03 Sp K1IV+F7V dist. 38.73 pc (126.34 l.y.)
 
 
Coord 2000 20467+1607 Discov num STF2727 Comp AB Coord arcsec 2000 20 46 39.50 +16 07 27.4
Date first 1755 Date last 2022 Obs 546
Pa first 280 Pa last 265.6 P.A. Now (θ) 265.6°
Sep first 12.0 Sep last 8.84 Sep. Now (ρ) 8.84"
Mag pri 4.36 Mag sec 5.03 delta mag (ΔM) 0.67 Spectral class K1IV+F7V (yellow-orange/yellow-white)
Pri motion ra -026 Sec motion ra -001
Pri motion dec -196 Sec motion dec -204
Notes N O Z (See Notes, Orbital solution, Parallax indicates components are physical)
rPM=0.129 (< 0.3, Physical double)
This double is physical.
 
 
20467+1607 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Gam2 Del 106477 20 46 40 +16 07 27 STF 2727 AB 2022 546 266 8.8 4.36 5.03 0.67 Y <===
Show 106477 20 46 40 +16 07 27 FYM 18 AD 2011 2 323 109.4 4.36 16.20 11.84
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Gam2 Del Constellation Delphinus SAO 106477 HIP 102532
Tycho2 1634-03056-1 Gaia DR2 1763000413341086464 HD 197964 HR 7948
GC 28966 ADS 14279 BD BD+15 4255 Bayer Gamma 2 Delphini
Bayer name Gam2 Del Flamsteed 12 Delphini Flamsteed name 12 Del FK5 1541
Distance 38.73 Distance ly 126.34 Bayer greek γ2 Del
 
 
ORBITAL ELEMENTS
 
 
Period (P)3249y Periastron (T)2305y Semi-major axis (a)10.22a
Eccentricity (e)0.88 Inclination (i)148.78° Longitude of periastron (ω)331.16°
Node (Ω)° Notesn ReferenceHle1994
Equinox2000 Last observation1993 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 177.8 9.267
2001 177.8 9.248
2002 177.7 9.229
2003 177.7 9.209
2004 177.6 9.190
2005 177.5 9.171
2006 177.5 9.151
2007 177.4 9.132
2008 177.4 9.112
2009 177.3 9.093
2010 177.3 9.073
2011 177.2 9.054
2012 177.2 9.034
2013 177.1 9.014
2014 177.0 8.995
2015 177.0 8.975
2016 176.9 8.955
2017 176.9 8.935
2018 176.8 8.915
2019 176.7 8.895
2020 176.7 8.875
2021 176.6 8.855
2022 176.6 8.835
2023 176.5 8.815
2024 176.4 8.795
2025 176.4 8.775
2026 176.3 8.755
2027 176.3 8.735
2028 176.2 8.714
2029 176.1 8.694
2030 176.1 8.674
2031 176.0 8.653
2032 175.9 8.633
2033 175.9 8.612
2034 175.8 8.592
2035 175.8 8.571
2036 175.7 8.550
2037 175.6 8.530
2038 175.6 8.509
2039 175.5 8.488
2040 175.4 8.468
2041 175.4 8.447
2042 175.3 8.426
2043 175.2 8.405
2044 175.2 8.384
2045 175.1 8.363
2046 175.0 8.342
2047 175.0 8.321
2048 174.9 8.299
2049 174.8 8.278
2050 174.8 8.257


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds20467%2B1607a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS 20467+1607 STF 2727 AB (Gam2 Del) : NOTES
 
 
discov_num notes refcode
STF2727 gam Del. A premature orbit has been computed. 1865.74 observation of Tal1868
Talmadge lists 16.537 in the Table for the separation but 11.536 in
the notes. The 11.536 value is included.
NLTT 49870/49868 Chm2004
H 3 10. MEv2010
Toyota et al. (2009) monitored the RV of both the A and B components
every 1-2 months between 2003 Mar - 2007 Nov, using a high-dispersion
echelle (precision ~10 m/s). Standard deviations of the RVs of both
components are <40 m/s and velocities show no periodic variation.
These results rejects the association of a planet of mass > 1.8 Mjup
with either star. Toy2009
FYM 18 The purported AC pair was in error and has been deleted. FyM2014b
 
 
REFERENCES
 
 
refcode metd author reference
Chm2004 E - Chaname, J. & Gould, A. 2004ApJ...601..289C
Chm2004 ApJ 601, 289, 2004
Chm2004 (Photometry, coordinates, and astrometry from rNLTT. Astrometry from early
Chm2004 versions of 2MASS and UCAC, with date given only as "circa 2000". Measures
Chm2004 identical to discovery observations - predominantly close pairs - were assumed
Chm2004 not new observations, so not included in WDS. Similar concerns when primary and
Chm2004 secondary magnitudes or proper motions were the same.)
FyM2014b C - Fay, M. .
FyM2014b private communication
Hle1994 C j Hale, A. 1994AJ....107..306H
Hle1994 +orb AJ 107, 306, 1994
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Tal1868 Ma - Talmage, C.G. ...................
Tal1868 Barclay Obs. 2, 1868
Toy2009 rv - Toyota, E., Itoh, Y., Ishiguma, S., Urakawa, S., Murata, D., Oasa, Y., 2008PASJ...61...19T
Toy2009 Matsuyama, H., Funayama, H., Sato, B., & Mukai, T.
Toy2009 PASJ 61, 19, 2009
 
 
DISCOVERER
 
 
discov author
CHM Chaname, J. & Gould, A.
TOY Toyota, E., Itoh, Y., Ishiguma, S., Urakawa, S., Murata, D., Oasa, Y.,
TOY Matsuyama, H., Funayama, H., Sato, B., & Mukai, T.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr dm_number notes coord_arcsec_2000
20467+1607 STF2727 AB 2013 515 266 9.0 4.36 5.03 K1IV F7V +15 4255 NOD 204639.50+160727.4
20467+1607 STF2727 AB 2015 518 266 8.9 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4
20467+1607 STF2727 AB 2016 528 266 9.0 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4
20467+1607 STF2727 AB 2017 531 266 8.9 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4
20467+1607 STF2727 AB 2018 534 266 8.9 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4
20467+1607 STF2727 AB 2019 540 265 8.9 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4
20467+1607 STF2727 AB 2020 544 266 8.8 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4
20467+1607 STF2727 AB 2022 546 266 8.8 4.36 5.03 K1IV+F7V +15 4255 NO Z 204639.50+160727.4

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

 
 
WDS 20467+1607 STF 2727 AB (Gam2 Del) : VISUAL OBSERVATIONS REPORTS
 
 
Show date username difficulty separation pa_estim interest notes
Show 25/07/30 daedalus1 mean difficulty separated 266   Very nice yellow and white stars. Primary is yellow, brighter than the very white companion. Beautiful color contrast.
Show 22/08/29 daedalus1 mean difficulty separated 265   Beautiful yellow-white pair. Primary considerably brighter, more yellow than white; companion more white than yellow. Seeing: Pickering 9, excellent. Measures: theta 265, rho 8.75 +/- 0.083

 
 
WDS 20467+1607 STF 2727 AB (Gam2 Del) : MEASURES
 
 
Records found: 1
Show date username difficulty sep sep_sigma pa pa_sigma delta_mag # notes
Show 25/07/30 daedalus1 mean difficulty 8.77 0.08 266.00 0.00 0.71 12 Seeing: Pickering 6, good
 
 
WDS 20467+1607 (Gam2 Del) : VIRTUAL EYEPIECE
 
 

20467+1607 STF2727A mag 4.36 Sp K1IV 20467+1607 STF2727B sep 8.8 P.A. 265.60 mag 5.03 Sp F7V 20467+1607 FYM 18D sep 109.4 P.A. 322.80 mag 16.2 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 20467+1607 (Gam2 Del) : ALADIN DSS IMAGE @ 20h 46m 39.50s +16° 07' 27.4"
 
 
 
 
WDS 20467+1607 STF 2727 AB (Gam2 Del) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20467+1607 STF2727AB distance=0' 20468+1602 BPM2264 distance=6' 20466+1616 BPM2261 distance=9' 20462+1554 WSI 110Aa,Ab distance=15' 20462+1554 STF2725AB distance=15' 20463+1624 BPM2257 distance=18' 20481+1601 BPM2269 distance=23' 20481+1616 SKF1770 distance=23' 20446+1605 BPM2245 distance=31' 20485+1628 BPM2271 distance=34' 20457+1537 BPM2255 distance=34' 20489+1558 BPM2275 distance=35' 20485+1545 BPM2272 distance=35' 20466+1532 J 3110 distance=36' 20446+1635 BPM2250BC distance=39' 20446+1635 BPM2248AB distance=41' 20446+1635 BPM2249AC distance=41' 20467+1523 BPM2263 distance=45' 20446+1642 BPM2246AB distance=46' 20446+1642 BPM2247AC distance=46' 20434+1604 HJ 1564 distance=46' 20462+1520 YR 27AB distance=48' 20501+1556 BPM2278 distance=51' 20477+1519 BPM2266 distance=51' 20436+1537 J 3108 distance=52' 20437+1635 BPM2237 distance=52' 20435+1540 GWP2990 distance=54' 20503+1630 LDS1048AB distance=56' 20503+1630 LDS1048AC distance=56' 20505+1616 KPP4216 distance=56' 20506+1601 BPM2281 distance=57' 20448+1512 BPM2253 distance=62' 20509+1544 BPM2282 distance=66' 20503+1649 TDT2571 distance=67' 20463+1715 GWP2995 distance=68' 20435+1657 STF2720 distance=68' 20456+1714 COU 425 distance=69' 20514+1619 BPM2283 distance=70' 20453+1715 GWP2993 distance=71' 20500+1702 UC 4303 distance=73' 20434+1512 UC 4270 distance=74' 20444+1500 BPM2243 distance=75' 20513+1647 J 3115 distance=77' 20501+1707 HEI 183 distance=78' 20518+1545 GWP3007 distance=78' 20415+1611 J 2319 distance=78' 20435+1504 CIA 11 distance=79' 20431+1705 BLL 51 distance=79' 20413+1551 UC 4257 distance=79' 20509+1517 J 3113 distance=80' 20508+1702 CVR 875 distance=81' 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 20467+1607 STF2727 AB 266 8.8 0
Show 20467+1607 FYM 18 AD 323 109.4 0
Show 20468+1602 BPM2264 222 107.2 6
Show 20466+1616 BPM2261 202 69.5 9
Show 20462+1554 WSI 110 Aa,Ab 166 0.0 15
Show 20462+1554 STF2725 AB 13 6.2 15
Show 20463+1624 BPM2257 337 107.8 18
Show 20481+1601 BPM2269 222 81.9 23
Show 20481+1616 SKF1770 223 3.4 23
Show 20446+1605 BPM2245 198 112.1 31
Show 20485+1628 BPM2271 127 97.8 34
Show 20457+1537 BPM2255 85 72.3 34
Show 20489+1558 BPM2275 143 74.7 35
Show 20485+1545 BPM2272 333 103.7 35
Show 20466+1532 J 3110 222 6.9 36
Show 20446+1635 BPM2250 BC 332 117.2 39
Show 20446+1635 BPM2248 AB 95 107.8 41
Show 20446+1635 BPM2249 AC 29 107.0 41
Show 20467+1523 BPM2263 265 53.6 45
Show 20446+1642 BPM2246 AB 16 90.0 46
Show 20446+1642 BPM2247 AC 173 116.0 46
Show 20434+1604 HJ 1564 41 11.3 46
Show 20462+1520 YR 27 AB 240 0.9 48
Show 20501+1556 BPM2278 296 68.3 51
Show 20477+1519 BPM2266 294 106.0 51
Show 20436+1537 J 3108 196 6.3 52
Show 20437+1635 BPM2237 49 108.4 52
Show 20435+1540 GWP2990 291 26.5 54
Show 20503+1630 LDS1048 AB 151 13.7 56
Show 20503+1630 LDS1048 AC 213 1.6 56
Show 20505+1616 KPP4216 237 1.6 56
Show 20506+1601 BPM2281 268 35.3 57
Show 20448+1512 BPM2253 241 75.8 62
Show 20509+1544 BPM2282 160 54.6 66
Show 20503+1649 TDT2571 258 0.8 67
Show 20463+1715 GWP2995 257 8.3 68
Show 20435+1657 STF2720 178 3.9 68
Show 20456+1714 COU 425 327 0.7 69
Show 20514+1619 BPM2283 243 38.1 70
Show 20453+1715 GWP2993 104 11.1 71
Show 20500+1702 UC 4303 81 18.2 73
Show 20434+1512 UC 4270 2 52.2 74
Show 20444+1500 BPM2243 169 106.5 75
Show 20513+1647 J 3115 322 7.2 77
Show 20501+1707 HEI 183 24 0.5 78
Show 20518+1545 GWP3007 163 8.1 78
Show 20415+1611 J 2319 192 7.5 78
Show 20435+1504 CIA 11 334 0.0 79
Show 20431+1705 BLL 51 159 56.3 79
Show 20413+1551 UC 4257 208 20.3 79
Show 20509+1517 J 3113 111 4.8 80

 
 
WDS 20467+1607 : COMPONENTS
 
 
  A B
B pa=265.6°
sep=8.84"
 
D pa=322.8°
sep=109.44"
pa=326.9°
sep=104.91"
 
 
20467+1607 A
 
 
Name Gam2 Del Coord arcsec 2000 204639.50+160727.4 Mag 4.36 Spectral class K1IV (yellow-orange)
PmRA -26.00 PmDE -196.0 Tycho2 1634-03056-1
Tycho2
Tycho2 1634-03056-1 Pflag RAmdeg 311.66458324 DEmdeg 16.12429081
PmRA -30.5 PmDE -198.4 E RAmdeg 4 E DEmdeg 4
E pmRA 0.7 E pmDE 0.8 EpRAm 1991.12 EpDEm 1991.04
Num 17 Q RAmdeg 1.5 Q DEmdeg 1.0 Q pmRA 1.7
Q pmDE 1.0 BTmag 5.534 E BTmag 0.014 VTmag 4.356
E VTmag 0.009 Prox 94 TYC T HIP 102532
CCDM A RAdeg 311.66465694 DEdeg 16.12476000 EpRA 1990 1.63
EpDE 1990 1.49 E RAdeg 3.5 E DEdeg 3.7 Posflg
Corr 0.4
CCDM
Ccdm 20467+1607 RComp Comp A Note1
Note2 Discov num DRAs -2.52 DDEs 27.6
R dRAs 10 Year Theta Rho
Obs 2 Vmag 4.5 Sp G5 PmNote *
PmRA -37 PmDE -191 Dm number +15 4255 Cat1 BD
Name2 106476 Cat2 SAO HD 197964 M HD
ADS BDS A14279 M ADS BDS N IDS IDS 20420N1546A
HIC 102532
 
 
20467+1607 B
 
 
Coord arcsec 2000 204638.89+160726.7 Mag 5.03 Spectral class F7V (yellow-white) PmRA -1.00
PmDE -204.0 Tycho2 1634-03057-1 Delta magnitude 0.67 Coordinate calculated yes
Tycho2
Tycho2 1634-03057-1 Pflag RAmdeg 311.66195431 DEmdeg 16.12412538
PmRA -1.3 PmDE -203.6 E RAmdeg 4 E DEmdeg 4
E pmRA 1.4 E pmDE 1.4 EpRAm 1991.50 EpDEm 1991.40
Num 7 Q RAmdeg 2.2 Q DEmdeg 1.0 Q pmRA 2.4
Q pmDE 0.9 BTmag 5.646 E BTmag 0.014 VTmag 5.028
E VTmag 0.009 Prox 94 TYC T HIP 102531
CCDM B RAdeg 311.66195750 DEdeg 16.12460444 EpRA 1990 1.62
EpDE 1990 1.53 E RAdeg 3.7 E DEdeg 3.8 Posflg
Corr 0.4
CCDM
Ccdm 20467+1607 RComp Comp B Note1 *
Note2 Discov num STF2727 DRAs -3.16 DDEs 27.1
R dRAs 91 Year 1957 Theta 268 Rho 10.0
Obs 99 Vmag 5.5 Sp G5 PmNote *
PmRA -19 PmDE -197 Dm number Cat1
Name2 106475 Cat2 SAO HD 197963 M HD
ADS BDS A14279 M ADS BDS N IDS IDS 20420N1546B
HIC 102531
 
 
20467+1607 D
 
 
Coord arcsec 2000 204634.91+160854.6 Mag 16.2 PmRA 4.00 PmDE -1.0
Delta magnitude 11.84 Coordinate calculated yes