Last night I decided to revisit SH2-142 using my Zenith Star 61ii ( I imaged it with my FLT91 a month or so ago). I planned for 50 images, per the Astrospheric forecast showed 0% cloud cover until about 00:30 then cloudy the rest of the night into dawn. Well I only made it to 23:00, for the clouds showed up early. I am not really all that pleased with this image, my data seemed noisy, maybe I should have used my L-enhance filter vs. the L-Ultimate or switch the ASI533MCP with my ASI2600MCP. I am sure my subs would have been better. The first night I used the Zenith Star I had some issues but had fun using it, but now I have decided to go back to the FLT91. So if I have a clear night tonight I just might choose SH2-142 again.
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NGC 7380 is a young
[4]open cluster of stars in the northern
circumpolar constellation of
Cepheus, discovered by
Caroline Herschel in 1787. The surrounding emission nebulosity is known colloquially as the
Wizard Nebula, which spans an angle of 25
′. German-born astronomer
William Herschelincluded his sister's discovery in his catalog, and labelled it H VIII.77. The nebula is known as S 142 in the 1959
Sharpless catalog (Sh2-142).
[2] It is extremely difficult to observe visually, usually requiring very dark skies and an O-III filter. The NGC 7380 complex is located at a distance of approximately 8.5
kilolight-years from the
Sun, in the
Perseus Arm of the
Milky Way.
[2]The cluster spans ~20 light-years (6 pc) with an elongated shape and an extended tail.
[2] Age estimates range from 4
[2] to 11.9
[1] million years. At the center of the cluster lies
DH Cephei, a close, double-lined
spectroscopic binary system consisting of two massive
O-type stars. This pair are the primary ionizing source for the surrounding
H II region, and are driving out the surrounding gas and dust while triggering star formation in the neighboring region.
[4] Of the
variable stars that have been identified in the cluster, 14 have been identified as
pre-main sequence stars while 17 are
main sequence stars that are primarily B-type variables.
[4]- Wu, Zhen-Yu; et al. (November 2009), "The orbits of open clusters in the Galaxy", Monthly Notices of the Royal Astronomical Society, 399 (4): 2146–2164, arXiv:0909.3737, Bibcode:2009MNRAS.399.2146W, doi:10.1111/j.1365-2966.2009.15416.x, S2CID6066790.
- Chen, W. P.; et al. (September 2011), "A Kinematic and Photometric Study of the Galactic Young Star Cluster NGC 7380", The Astronomical Journal, 142(3): 15, Bibcode:2011AJ....142...71C, doi:10.1088/0004-6256/142/3/71, S2CID120469041, 71.
- "NGC 7380". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-18.
- Lata, Sneh; et al. (March 2016), "Variable stars in young open star cluster NGC 7380", Monthly Notices of the Royal Astronomical Society, 456 (3): 2505–2517, arXiv:1511.08892, Bibcode:2016MNRAS.456.2505L, doi:10.1093/mnras/stv2800, S2CID118473907.
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