NTK
(See Notes, Parallax indicates physical, K-band or other infrared magnitudes)
Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
rPM=0.103 (< 0.3, Physical double)
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Constellation
Camelopardalis
WDS 06579+6220 HEN 2 : NOTES
discov_num
notes
refcode
HEN 2
Delta-M is in K band.
LSPM J0657+6219 = GJ 3417. Law et al (2008) derive a distance of
Law2008
11.4 +/-0.3 pc and a projected separation of 17.5 +0.5/-0.5 au.
Estimated spectral types are M4.5 and M6.5.
GJ 3417 = LHS 1885. If taken at face value, the body of astrometric
points that exists for this target does not make sense. Three epochs
of astrometry exists: One from Henry et al. (1997) taken in 1996 (rho
Hen1997
= 2.0" and theta = 220deg), one from Law et al. (2008) taken in 2005
Law2008
(rho = 1.5" and theta = 320deg), and our data point taken in 2012 (rho
= 1.4" and theta = 240deg). Given that background objects can be
firmly excluded, this would imply an enormously fast orbital motion
since the binary would move from 220deg to 320deg and then back to
240deg within 16 years, which is impossible for such a low-mass binary
with a ∼17 au semi-major axis. However, the astometry becomes entirely
sensible in an orbital motion framework if we impose a 90deg phase
shift on the Law et al. (2008) position angle such that it is 230deg
instead, giving a continous motion of 20deg in 16 years. In Janson et
al. (2012), we suggested an equal phase shift for similar reasons for
Jnn2012
the Law et al (2008) data point in the 15553178+3512028 binary system.
Jnn2014
Estimated age 60-300 Myr; masses 0.30 +/- 0.14 and 0.15 +/- 0.08 Msun;
a ~16.5 au.
Jnn2014
REFERENCES
refcode
metd
author
reference
Hen1997
Si -
Henry, T.J., Ianna, P.A., Kirkpatrick, J.D., & Jahreiss, H.
1997AJ....114..388H
Hen1997
AJ 114, 388, 1997
Jnn2012
Cl j
Janson, M., Hormuth, F., Bergfors, C., Brandner, W., Hippler, S., Daemgen, S.,
2012ApJ...754...44J
Jnn2012
+E2
Kudryavtseva, N., Schmalzl, E., Schnupp, C., & Henning, T.
Jnn2012
ApJ 754, 44, 2012 (some recalibrated measures published in Jnn2014b)
2014ApJS..214...17J
Jnn2014
A -
Janson, M., Bergfors, C., Brandner, W., Kudryavtseva, N., Hormuth, F.,
2014ApJ...789..102J
Jnn2014
+Cl
Hippler, S., & Henning, T.
Jnn2014
ApJ 789, 102, 2014
Law2008
Ss -
Law, N.M., Hodgkin, S.T., & Mackay, C.D.
2008MNRAS.384..150L
Law2008
MNRAS 384, 150, 2008
Law2008
All measures of known pairs in Law2008 appear to be off by 90 (or 270) degrees.
Law2008
Corrected and N code code added to measure.
WDS HISTORIC DATA
coord_2000
discov_num
comp
epoch
obs
pa
sep
mag_pri
mag_sec
spectr
notes
coord_arcsec_2000
06579+6220
HEN 2
2004
2
34
0.9
13.80
15.70
M4.5
N K
065757.08+621920.0
06579+6220
HEN 2
2005
3
320
1.5
13.80
15.70
M4.5
N K
065757.08+621920.0
06579+6220
HEN 2
2012
5
240
1.4
13.80
15.70
M4.5
N K
065757.08+621920.0
06579+6220
HEN 2
2015
6
246
1.3
13.80
15.70
M4.5
N K
065757.08+621920.0
06579+6220
HEN 2
2017
8
248
1.2
13.80
15.70
M4.5
NT K
065757.08+621920.0
If you need more information about this double, apply for a data request form to the WDS.
WDS 06579+6220 HEN 2 : VISUAL OBSERVATIONS REPORTS
No records found.
WDS 06579+6220 HEN 2 : MEASURES
No records found.
WDS 06579+6220 : VIRTUAL EYEPIECE
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