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Doubles in session


Current system
04271+2542
THB 1
DF Tau


Nearby doubles
19' : 04257+2545
LDS5557

21' : 04278+2525
OCC9090

24' : 04271+2606
KSA 19AB

25' : 04269+2607
LEI 2AB

26' : 04252+2545
TOK 247

37' : 04246+2556
LDS5552

38' : 04287+2613
HDS 576

39' : 04280+2619
DCH 52AB

42' : 04247+2610
KSA 17

43' : 04253+2618
WHT 1AB

46' : 04299+2607
HER 9AB

48' : 04236+2543
LDS5550

48' : 04295+2617
SMN 11AB

49' : 04301+2515
TDS2873

50' : 04277+2631
GIC 47

51' : 04308+2543
LDS6131

53' : 04243+2506
POU 447

53' : 04236+2520
LDS1167

54' : 04307+2601
SMN 12

58' : 04233+2516
POU 444

59' : 04269+2444
DCH 51AB

60' : 04293+2634
KSA 106

61' : 04226+2538
STF 528AB

62' : 04236+2503
MTZ 2

62' : 04297+2633
HAT 6AB

66' : 04237+2456
ITO 25



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.

04271+2542 THB 1 (DF Tau)

 
 
04h 27m 02.79s +25° 42' 22.6" P.A. 183.00 sep 0.1 mag 12.62,13.51 Sp M2.0+M2.5 dist. 45.89 pc (149.69 l.y.)
 
 
Coord 2000 04271+2542 Discov num THB   1 Comp Coord arcsec 2000 04 27 02.79 +25 42 22.6
Date first 1986 Date last 2016 Obs 57
Pa first 350 Pa last 182.6 P.A. Now (θ) 111.8°
Sep first 0.1 Sep last 0.086 Sep. Now (ρ) 0.062"
Mag pri 12.62 Mag sec 13.51 delta mag (ΔM) 0.89 Spectral class M2.0+M2.5 (red/red)
Pri motion ra +006 Sec motion ra
Pri motion dec -020 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name DF Tau Constellation Taurus HIP 20777 Tycho2 1820-00176-1
Gaia DR2 151179966897747840 HD 283654 Distance 45.89 Distance ly 149.69
 
 
ORBITAL ELEMENTS
 
 
Period (P)46.1y± 1.9 Periastron (T)1979.2y± 1.5 Semi-major axis (a)94.9m± 2.2
Eccentricity (e)0.233± 0.038 Inclination (i)145.5°± 1.6 Longitude of periastron (ω)309.2°± 3.5
Node (Ω)33.9°± 5 Notesn ReferencePra2017
Equinox2000 Last observation2016 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 271.2 0.101
2001 265.7 0.103
2002 260.5 0.105
2003 255.4 0.106
2004 250.5 0.108
2005 245.7 0.109
2006 241.0 0.110
2007 236.4 0.110
2008 231.7 0.110
2009 227.1 0.110
2010 222.3 0.108
2011 217.5 0.107
2012 212.4 0.105
2013 207.1 0.102
2014 201.5 0.098
2015 195.4 0.094
2016 188.7 0.090
2017 181.3 0.085
2018 172.9 0.079
2019 163.4 0.074
2020 152.4 0.070
2021 140.1 0.066
2022 126.4 0.063
2023 111.8 0.062
2024 97.2 0.063
2025 83.2 0.065
2026 70.3 0.068
2027 58.5 0.071
2028 47.8 0.074
2029 38.0 0.077
2030 28.8 0.079


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


 
  


wds04271%2B2542b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 04271+2542 THB 1 (DF Tau) : NOTES
 
 
discov_num notes refcode
THB 1 Preliminary orbital elements give total mass 2.8 +/- 1.5 Msun. Thb1995b
Tamazian et al. (2002) solution includes mass determination based on Tam2002
estimated distance.
DF Tau orbit by Schaefer et al. (2006) gives range 1974-2022 for T, Sfr2006
0.05-0.76 for e. Values for P and a are lower limits.
Assuming a distance of 140 pc, Schaefer et al. (2014) derive a total
mass 1.17 +/- 0.13 Msun. The orbital period of 43.7y closely matches
the 44yr timescale of photometric variations; this is consistent with
a suggestion by Lamzin et al. (2001 A&A 372, 922) that the variability
is caused by the circumstellar accretion rate onto the primary being
modulated by the orbital motion of the companion. Sfr2014
 
 
REFERENCES
 
 
refcode metd author reference
Pra2017 A j Allen, T.S., Prato, L., Wright-Garba, N., Schaefer, G., Biddle, L.I., Skiff, B., 2017ApJ...845..161A
Pra2017 +Zc Avilez, I., Muzzio, R., & Simon, M.
Pra2017 +orb ApJ 845, 161, 2017 (see paper for additional system BVI photometry, etc.)
Sfr2006 Hf j Schaefer, G.H., Simon, M., Beck, T.L., Nelan, E., & Prato, L. 2006AJ....132.2618S
Sfr2006 +A AJ 132, 2618, 2006
Sfr2006 (information slightly updated using information from Sfr2012. Photometry of DF Tau
Sfr2006 = 04271+2542 = THB 1 corrected and converted to V-band by Allen et al. 2017) 2017ApJ...845..161A
Sfr2014 orb j Schaefer, G.H., Prato, L., Simon, M., & Patience, J. 2014AJ....147..157S
Sfr2014 +A AJ 147, 157, 2014
Tam2002 Si j Tamazian, V.S., Docobo, J.A., White, R.J., & Woitas, J. 2002ApJ...578..925T
Tam2002 +orb ApJ 578, 925, 2002
Thb1995b S - Thiebaut, F., Balega, Y., Balega, I., Belkine, I., Bouvier, J., Foy, R., 1995A&A...304L..17T
Thb1995b Blazit, A., & Bonneau, D.
Thb1995b A&A 304, L17, 1995
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
04271+2542 THB 1 2002 31 262 0.1 11.00 11.50 M0V NOD 042702.79+254222.6
04271+2542 THB 1 2005 36 242 0.1 11.00 11.50 M0V NOD 042702.79+254222.6
04271+2542 THB 1 2014 47 202 0.1 12.62 13.51 M2.0 M2.5 NOD 042702.79+254222.6
04271+2542 THB 1 2016 49 183 0.1 12.62 13.51 M2.0+M2.5 NO 042702.79+254222.6

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

 
 
WDS 04271+2542 THB 1 (DF Tau) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 04271+2542 THB 1 (DF Tau) : MEASURES
 
 
No records found.

 
 
WDS 04271+2542 (DF Tau) : VIRTUAL EYEPIECE
 
 

04271+2542 THB 1A mag 12.62 Sp M2.0 04271+2542 THB 1B sep 0.1 P.A. 182.30 mag 13.51 Sp M2.5 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 04271+2542 (DF Tau) : ALADIN DSS IMAGE @ 04h 27m 02.79s +25° 42' 22.6"
 
 
 
 
WDS 04271+2542 THB 1 (DF Tau) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

04271+2542 THB 1 distance=0' 04257+2545 LDS5557 distance=19' 04278+2525 OCC9090 distance=21' 04271+2606 KSA 19AB distance=24' 04271+2606 LOO 5AC distance=24' 04269+2607 SMN 10Ca,Cb distance=25' 04269+2607 LEI 2AB distance=25' 04269+2607 CHN 2AB,C distance=25' 04269+2607 HAT 5AB,D distance=25' 04252+2545 TOK 247 distance=26' 04246+2556 LDS5552 distance=37' 04287+2613 HDS 576 distance=38' 04280+2619 PAD 27Aa,Ab distance=39' 04280+2619 DCH 52AB distance=39' 04247+2610 KSA 17 distance=42' 04253+2618 COR 2Ba,Bb distance=43' 04253+2618 COR 2Aa,Ab distance=43' 04253+2618 WHT 1AB distance=43' 04299+2607 ITO 28BC distance=46' 04299+2607 HER 9AB distance=46' 04299+2607 ITO 28AC distance=46' 04299+2607 ITO 28AD distance=46' 04236+2543 LDS5550 distance=48' 04295+2617 SMN 11AB distance=48' 04295+2617 WHT 2AC distance=48' 04295+2617 HER 8AD distance=48' 04301+2515 TDS2873 distance=49' 04277+2631 GIC 47 distance=50' 04308+2543 LDS6131 distance=51' 04243+2506 POU 447 distance=53' 04236+2520 LDS1167 distance=53' 04307+2601 SMN 12 distance=54' 04233+2516 POU 444 distance=58' 04269+2444 REP 114Aa,Ab distance=59' 04269+2444 DCH 51AB distance=59' 04293+2634 KSA 106 distance=60' 04226+2538 ITO 23BC distance=61' 04226+2538 ITO 23BD distance=61' 04226+2538 ITO 23BE distance=61' 04226+2538 STF 528AB distance=61' 04236+2503 MTZ 2 distance=62' 04297+2633 GHE 7Aa,Ab distance=62' 04297+2633 HAT 6AB distance=62' 04297+2633 ITO 13AD distance=62' 04297+2633 ITO 13BC distance=62' 04237+2456 ITO 25 distance=66' 04248+2643 KOH 10Ba,Bb distance=68' 04248+2643 KOH 10Aa,Ab distance=68' 04248+2643 KOH 10Aa,Ba distance=68' 04248+2643 KU 84AC distance=68' 04220+2538 DAM 761 distance=69' 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 04271+2542 THB 1 183 0.1
Show 04257+2545 LDS5557 269 163.1 19
Show 04278+2525 OCC9090 -1 0.0 21
Show 04271+2606 KSA 19 AB 235 16.1 24
Show 04271+2606 LOO 5 AC 211 53.9 24
Show 04269+2607 SMN 10 Ca,Cb 294 0.6 25
Show 04269+2607 LEI 2 AB 274 0.7 25
Show 04269+2607 CHN 2 AB,C 105 12.1 25
Show 04269+2607 HAT 5 AB,D 117 57.4 25
Show 04252+2545 TOK 247 271 43.0 26
Show 04246+2556 LDS5552 265 170.5 37
Show 04287+2613 HDS 576 240 0.1 38
Show 04280+2619 PAD 27 Aa,Ab 266 0.2 39
Show 04280+2619 DCH 52 AB 15 4.6 39
Show 04247+2610 KSA 17 338 27.8 42
Show 04253+2618 COR 2 Ba,Bb 158 0.1 43
Show 04253+2618 COR 2 Aa,Ab 75 0.2 43
Show 04253+2618 WHT 1 AB 234 3.4 43
Show 04299+2607 ITO 28 BC 170 0.6 46
Show 04299+2607 HER 9 AB 305 10.8 46
Show 04299+2607 ITO 28 AC 304 10.6 46
Show 04299+2607 ITO 28 AD 163 9.8 46
Show 04236+2543 LDS5550 64 8.6 48
Show 04295+2617 SMN 11 AB 317 0.1 48
Show 04295+2617 WHT 2 AC 296 2.3 48
Show 04295+2617 HER 8 AD 248 12.0 48
Show 04301+2515 TDS2873 286 1.1 49
Show 04277+2631 GIC 47 196 11.1 50
Show 04308+2543 LDS6131 323 139.2 51
Show 04243+2506 POU 447 151 11.4 53
Show 04236+2520 LDS1167 197 3.0 53
Show 04307+2601 SMN 12 118 3.4 54
Show 04233+2516 POU 444 344 15.6 58
Show 04269+2444 REP 114 Aa,Ab 283 0.3 59
Show 04269+2444 DCH 51 AB 320 22.1 59
Show 04293+2634 KSA 106 19 0.1 60
Show 04226+2538 ITO 23 BC 245 11.6 61
Show 04226+2538 ITO 23 BD 227 11.0 61
Show 04226+2538 ITO 23 BE 264 10.6 61
Show 04226+2538 STF 528 AB 25 19.4 61
Show 04236+2503 MTZ 2 123 5.7 62
Show 04297+2633 GHE 7 Aa,Ab 294 0.1 62
Show 04297+2633 HAT 6 AB 306 15.3 62
Show 04297+2633 ITO 13 AD 132 5.1 62
Show 04297+2633 ITO 13 BC 139 2.4 62
Show 04237+2456 ITO 25 245 2.5 66
Show 04248+2643 KOH 10 Ba,Bb 135 0.2 68
Show 04248+2643 KOH 10 Aa,Ab 320 0.5 68
Show 04248+2643 KOH 10 Aa,Ba 158 7.9 68
Show 04248+2643 KU 84 AC 296 13.2 68
Show 04220+2538 DAM 761 277 20.6 69

 
 
WDS 04271+2542 : COMPONENTS
 
 
  A
B pa=182.3°
sep=0.09"
 
 
04271+2542 A
 
 
Componente originario normalizzato AB Name DF Tau Coord arcsec 2000 042702.79+254222.6 Mag 12.62
Spectral class M2.0 (red) PmRA 6.00 PmDE -20.0 HIP 20777
Hipparcos
Catalog H HIP 20777 Proxy RAhms 04 27 02.79
DEdms +25 42 22.6 Vmag 11.96 VarFlag 3 R Vmag H
RAdeg 66.7616 DEdeg 25.7063 AstroRef * Plx 25.72
CCDM N CCDM Nsys Ncomp 1
MultFlag V Source Qual M HIP
Theta Rho HD BD
CD CP Dm number VIred 1.6
SpType M0-M3Ve(T) R SpType Coord arcsec 2000 042702.79+254222.6
Hipparcos 2
HIP 20777 Sn 5 So 5 Nc 1
RArad 1.1652098711 DErad 0.4486590044 Plx 21.79 PmRA 12.82
PmDE -19.09 E RArad 5.98 E DErad 4.27 E Plx 6.8
E pmRA 6.56 E pmDE 4.98 Hpmag 12.0807 E Hpmag 0.0498
SHp 0.338 VA 2 BV 1.47 E BV 0.51
VI 1.6
 
 
04271+2542 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 042702.79+254222.5 Mag 13.51 Spectral class M2.5 (red)
Calc delta mag 0.89 Calc coord yes