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 Herschel included 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]
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Technical card of image
Imaging telescopes or lenses: William Optics 81GT IV
Imaging cameras: ZWO ASI 6200 MM Pro
Mounts: Celestron Advanced VX Goto GEM Celestron AVX
Guiding telescopes or lenses: William Optics RedCat 51 Petzval APO Redcat 51
Guiding cameras: ZWO ASI522mc-pro color ZWO
Software: Adobe Photoshop 2021 · PixInsight 1.8 Ripley PinInsight 1.8.8
Filters: ZWO SII 7nm 2″ · ZWO OIII 7nm 2″ · ZWO H-alpha 7nm 2″
Dates: Sept. 19, 2021
Frames:
ZWO H-alpha 7nm 2″: 38×300″ (3h 10′) (gain: 110.00) -15C bin 1×1
ZWO OIII 7nm 2″: 46×300″ (3h 50′) (gain: 110.00) -15C bin 1×1
ZWO SII 7nm 2″: 25×300″ (2h 5′) (gain: 110.00) -15C bin 1×1
Integration: 9h 5′
Darks: 25
Flats: 20
Bias: 50
Avg. Moon age: 13.28 days
Avg. Moon phase: 97.52%
RA center: 22h46m59s.317
DEC center: +58°05′59″.16
Pixel scale: 1.514 arcsec/pixel
Orientation: -175.039 degrees
Field radius: 0.627 degrees
WCS transformation: thin plate spline
More info:
| Observation data (J2000.0 epoch) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 47m 21.0s[1] |
| Declination | +58° 07′ 54″[1] |
| Distance | 8.5 ± 1.3 kly (2.6 ± 0.4 kpc)[2] |
| Apparent magnitude (V) | 7.2 |
| Apparent dimensions (V) | 25′ |
| Physical characteristics | |
| Radius | ~20 ly (6 pc) |
| Estimated age | 4[2] to 11.9 Myr[1] |
| Other designations | NGC 7380,[3] Sh2-142, Cr 452 |
NGC 7380 Starless Wizard Nebula
