Messier 35 or M35, also known as NGC 2168 or the Shoe-Buckle Cluster, is a relatively close
open cluster of
stars in the west of
Gemini, at about the declination of the sun when the latter is at
June solstice.[a] It was discovered by
Philippe Loys de Chéseaux around 1745 and independently discovered by
John Bevis before 1750.[3] It is scattered over part of the sky almost the size of the
full moon and is 2,970
light-years (912
parsecs) away.[1] The compact open cluster
NGC 2158 lies directly southwest of it.
Leonard & Merritt (1989) computed the mass of M35 using a
statistical technique based on
proper motion velocities of its stars. The mass within the central 3.75 parsecs (12.2 ly) was found to be between 1600 and 3200 solar masses,[b] consistent with the mass of a realistic stellar population within the same radius.[7] Bouy
et al. in 2015 found a mass of around 1,600
M☉ within the central 27.5' × 27.5
′. There are 305 stars that can be intrinsically shown to be extremely likely to be members,[c] and up to 4,349 averaging the 50% membership probability, from the kinematic (such as
parallax and
proper motion) and spectral data published before 2015.[4] The cluster's
metallicity is [Fe/H] = −0.21±0.10, where −1 would be ten times less metallic than the sun.[4]
Of 418 probable members, Leiner
et al. in 2015 found 64 that have variable
radial velocities thus are
binary star systems.[8] Four probable members are
chemically peculiars, while
HD 41995, which in the (telescopic angular) cluster field, shows
emission lines.[9] Hu
et al. in 2005 found 13
variable stars in the field; at least three are suspect as cluster members. To be a member means to have a gravitational tie or, if recently freed, having been created by the same event.[10]
^Leiner, E. M.; Mathieu, R. D.; Gosnell, N. M.; Geller, A. M. (July 2015). "WIYN Open Cluster Study. LXVI. Spectroscopic Binary Orbits in the Young Open Cluster M35 (NGC 2168)". The Astronomical Journal. 150 (1): 18.
Bibcode:
2015AJ....150...10L.
doi:
10.1088/0004-6256/150/1/10.
S2CID123818978. 10.
^Paunzen, E.; et al. (April 2014), "Photoelectric search for peculiar stars in open clusters. XV. Feinstein 1, NGC 2168, NGC 2323, NGC 2437, NGC 2547, NGC 4103, NGC 6025, NGC 6633, Stock 2, and Trumpler 2", Astronomy & Astrophysics, 564: 8,
arXiv:1403.3538,
Bibcode:
2014A&A...564A..42P,
doi:
10.1051/0004-6361/201423521,
S2CID119174151, A42
^Hu, Juei-Hwa; et al. (August 2005). "Discovery of 13 New Variable Stars in the Field of the Open Cluster NGC 2168 (M35)". Chinese Journal of Astronomy and Astrophysics. 5 (4): 356–362.
Bibcode:
2005ChJAA...5..356H.
doi:
10.1088/1009-9271/5/4/003.