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Sh 2-202, Stock 23, Camelopardalis

Sh 2-202, Stock 23, Camelopardalis

530 mm f/5 18.7 hours, November 2013, Photograph

LBN 139.57+2.70 — The arc-shaped ionized emission from LBN 139.57+2.70 is associated with a hole in HI at Perseus Arm velocities and contains a Young Stellar Object (YSO) at its edge. The nebulosity and HI hole are consistent with a wind-driven bubble blown by the early B star ALS 7666, which is located close to the projected center of the radio arc. The bubble has an estimated distance of 2 kpc, an age of 0.3 Myr, and an expansion velocity of 700 km/s. From Karr, et al., Three Lynds bright nebula, The Astrophysical Journal, 595:880-890, 2003 October 1.

LBN 140.07+1.64 — The ionized emission from the northern portion of LBN 140.07+1.64, which extends across the center of the photograph, is not correlated with CO at Perseus Arm velocities and appears to be a foreground object of LBN 139.57+2.70. The Camelopardalis OB1 association provides the illumination for this nebulosity and the diffuse dust emission. The Cam OB1 association has an estimated distance of 1 kpc. Star formation has been going in the association for 1 to 100 Myrs. The OB-type stars HD 20898, HD 20508, HD 20134, HD 237090 and CC Cas are members of the association. From Karr, et al., Three Lynds bright nebula, The Astrophysical Journal, 595:880-890, 2003 October 1. From Lyder, The stars in Camelopardalis OB1: Their distance and evolutionary history, The Astronomical Journal, 1122:2634-2643, 2001 November.

Stock 23 — The open cluster Stock 23 is a foreground object of LBN 140.07+1.64 at a distance of 380 pc. In the V vs. B-V diagram the stars of this group are so scattered that the cluster probably is not real. Stock 23 is part of the local Gould Belt ring of stars through which our Sun is currently traveling. Stock 23 has an estimated age of 32 Myr and a color-excess E(B-V) of 0.26 mag. From Straižys, et al., Young stars in the Camelopardalis dust and molecular clouds: The Cam OB1 association, Baltic Astronomy, 16:167-182, 2007.

CC Cas — CC Cas is an eclipsing binary of Beta Lyrae type with detached, massive early-type components. The two components are so close that their shapes are heavily distorted by mutual gravitational forces. The system has a period of 3.4 days, a magnitude range of +7.06 to +7.30, and is a member of the Cam OB1 association. From Gorda, CCD spectrophotometry of CC Cas. I. Radial velocity curves, Astrophysical Bulletin, 68(1):101-106, 2013 January.

Sh 2-202 — The 2 degree diameter HII region Sh 2-202 encompasses LBN 139.57+2.70, LBN 140.07+1.64, and also LBN 140.77-1.42 outside the photograph. Sh 2-202 contains several ionziation front-like structures visible in the magnified crops here, here, and here. Such structures are associated with recent episodes of star formation as extreme ultraviolet (EUV) radiation emanating from young massive stars are responsible destroying and ionizing molecular material along the boundaries of the fronts.

Coordinates: RA 3h 18.5m, Dec +60° 12’, PA -0° 9’
Field of view: 1° 56’ x 1° 28’
Image scale: 4.2” / pixel

Date: November 2013
Location: Kofa Mountains, Arizona
Exposure: 28 x 40 minutes (18.7 hours), binned 2 x 2 at -20° C

Zenith SQM: 21.3 mag / "²
Guiding error: 0.7" rms
Star FWHM: 4.0", histogram
Star eccentricity: 0.39
Camera noise: 15 e- rms
Background noise: 22 e- rms
Subframe location: 235 e-
Subframe scale: 37 e-

Telescope: Takahashi FSQ-106EDX 530 mm f/5
Camera: Quantum Scientific Imaging 683wsg
Filter: Astrodon H-alpha, 3 nm bandwidth
Focuser: Finger Lakes Instrumentation Atlas, Quality Thermistor DirecTemp DTU6024C, Spike-a Bahtinov Mask
Detilter: Gerd Neumann CTU XL
Guider: Santa Barbara Instrument Group ST-i
Flats: Alnitak Astrosystems Flat-Man
USB: Icron Ranger 2122, Moxa UPort 404
Mount: Takahashi EM-400 Temma2M
Acquisition: Diffraction Limited MaxIm DL, CCDAstro Temma, IHRP Platform, ASCOM Platform
Processing: Pleiades Astrophoto PixInsight, MathWorks MATLAB, IHRP Platform