Constellation tour in Autumn
Cepheus

Click on image to enlarge

Date & Time: Dec 12 2020, from 21:23 to 21:59 JST(+0900)
Composed 8 shots with 5 minutes exposed
Optical: TAMRON 17-35mm Di OSD (f=35mm, stop: F4.0)
with IDAS LPS-P2-FF & Kenko Softon Clear filters
Auto-guided with Kenko SKYMEMO Equatorial
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO800



Astroarts StellaNavigator 		Cepheus is name of the ancient Ethiopian king, which of asterism can be found in the autumn's Milky Way just west of Cassiopeia's chair. The constellation mainly consists of five stars with mostly third and fourth magnitude, and they forms a strained pentagon. Constellation Cepheus is positioned at fairly northern region in the celestial sphere; there is the Polar star just outside of this picture in upward. The constellation includes various shaped diffuse and dark nebulae.
The Cepheus is famous for a prototype of the important class of variables, δ-Cephei, so-called "The Cepheid". The variable forms the constellation at the left end of stretched lines from a lower end (southern side) star of the pentagon. The Cepheid has the fixed period-luminosity relation. Studies in the period of pulsation and the apparent magnitude led astronomers to devise a method of gauging the distance to outer galaxies. So the variable is often compared to the Lighthouse in the universe, we couldn't see the remarkable progress in common astronomy without the Cepheid.


Guide for Deep Sky Objects

Nebulosities around Cassiopeia & Cepheus .....Distribution of dimmed nebulae around border to Cassiopeia
IC1396 .....Huge Diffused Nebula in the Milky Way
Dark nebulae around IC1396 .....Wide-field image of distribution of dark nebulae in southern Cepheus.
IC1396 to Sh2-129 .....Two vast diffused nebulae in southern part
IC1470 .....Small diffused nebula near a boundary on Cassiopeia
NGC40 .....Large reddish Planetary Nebula in NE region
NGC2276, NGC2300 .....Asymmetry spiral & Lenticular galaxies at Dec. of +85deg.
NGC7139 .....Small & red planetary nebula in pentagon of Cepheus
NGC7822 ...Complicated H-alpha diffused nebula at the border to Cassiopeia
NGC6939 & NGC6946 ...Open Cluster & spiral galaxy paralleled 0.7deg. apart around west edge.
NGC7023 ...Tiny reflection nebula 6deg. NNW of alpha Cep.
NGC7133, NGC7142 ...Reflection nebula & open cluster with 20' apart in central region
NGC7160 ...A small open cluster in center of pentagon
NGC7235, NGC7261 ...Two small open clusters in SE of pentagon
Sh2-129 ...A dimmed semicircular diffused nebula 4 deg. west of IC1396
Sh2-132 ...Medium-sized diffused nebula 1 deg. SE of epsilon Cep
Sh2-135 ...Small-sized diffused nebula in 1.5 deg. NW of zeta Cep.
Sh2-136 ...Small reflection nebula in 6deg. north of alpha Cephei, "The Ghost Nebula"
Sh2-140 ...Crescent-shaped nebula about 5deg. north of zeta Cep.
Sh2-142 ...Small reddish nebula positioned in southeast edge of Cep.
Cave Nebula(Sh2-155) ...Small diffused & dark nebula near a border to Cas.
Around vdB152 & LDN1235(Shark Nebula) ...Dimmed reflection & dark nebulae in northern pentagon, minor objects outskirts
PK107+7.1 ... A 15'-sized dimmed planetary nebula at center of Cepheus's pentagon
Gyulbudaghian's Nebula ...Small reflection nebula in western edge



Cassiopeia
Perseus

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