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User / hirocun
Hisayoshi Kato / 2,184 items

N 7 B 302 C 0 E Nov 26, 2022 F Nov 30, 2022
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The comet was drifting slowly toward west a bit northward in Gemini at the night. It looked small, though outburst happened recently. The dust distributed round except northeast quarter. Center part was brighter than peripheral part. Far fainter dust distribution was around the denser dust area. The distribution was round-shaped but deviated toward northwest. North is up, and east is to the left.

Sun Distance: 6.046AU
Earth Distance: 5.240AU

The comet taken on Febluary 23, 2022 with the same equipment and presented in the same scale:
www.flickr.com/photos/hiroc/51902945283/in/dateposted/

Mission 29P - Centaur comet observing campaign in British Astronomical Association: britastro.org/node/25120

equipment: AstroPhysics 130GTX "Granturismo," Field Flattener at f/6.7 focal length 873mm, 22.1mm Spacer, EOS Adapter, Kipon EOS-EOS R adapter, and Canon EOS R-SP4II, modified by Seo-san on Vixen AXD Equatorial Mount, auto guided at a star nearby with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, GPUSB, and PHD2 Guiding with comet tracking on

exposure: 17 times x900 seconds, 9 x 240 sec, and 8 x 60 seconds at ISO 3,200 and f/6.7 focal length 873mm

The first exposure started at 13:38;10UTC November 26, 2022.

site: 733m above sea level at lat. 35 22 03 North and long. 138 32.59 East in Asagiri Highland 静岡県朝霧高原. Ambient temperature was around 5 degrees Celsius or 41 degrees Fahrenheit. Wind was mild. SQML reached 21.08.

Here is a frame of the site at the night.
www.flickr.com/photos/hiroc/52531385750/in/photostream/

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This is my rig imaging of comet C/2022 E3 ZTF. Yellow arrows indicates the location of the object. It was low, 7 degrees above horizon in the light dome of Tokyo. The data were terrible, and I did not use them for the frame of the comet below.

C/2022 E3 ZTF with AP130 November 26, 2022:
www.flickr.com/photos/hiroc/52529366969/in/dateposted/

equipment: Sony DSC-RX1 on a compact tripod

site: 733m above sea level at lat. 35 22 03 North and long. 138 32.59 East in Asagiri Highland 静岡県朝霧高原. Ambient temperature was around 5 degrees Celsius or 41 degrees Fahrenheit. Wind was mild. SQML reached 21.08. Seeing was bad, and guide error RMS was around 3" at the low elevation in the sky. The view was open toward the direction there, but the site was not suitable for imaging of rising comets.

N 13 B 380 C 0 E Nov 26, 2022 F Nov 28, 2022
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I could enjoy astroimaging through Saturday night. It was clear and calm, though weather forecast suggested windy night after storm.

The comet was approaching us and looked bigger than before. It was drifting very slowly toward east southeast in Serpens. Dust coma was small and round, and dust tail was toward northeast, curving toward east. Bluish green ion halo was round and small. Ion tail was faint toward north northeast, though it was almost indetectable. North is up, and east is to the left on the frame.

Sun Distance: 1.343AU
Earth Distance: 1.830AU

The comet taken on October 20, 2022 with the same equipment and presented in the same scale:
www.flickr.com/photos/hiroc/52442756492

equipment: AstroPhysics 130GTX "Granturismo," Field Flattener at f/6.7 focal length 873mm, 22.1mm Spacer, EOS Adapter, Kipon EOS-EOS R adapter, and Canon EOS R-SP4II, modified by Seo-san on Vixen AXD Equatorial Mount, auto guided at a star nearby with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, GPUSB, and PHD2 Guiding with comet tracking on

exposure: 6 times x 360 seconds, 3 x 180 sec, and 5 x 60 seconds at ISO 1,600 and f/6.7 focal length 873mm

The first exposure started at 19:46:50UTC November 26, 2022. The object was yet low in the east in the morning sky.

site: 733m above sea level at lat. 35 22 03 North and long. 138 32.59 East in Asagiri Highland 静岡県朝霧高原. Ambient temperature was around 5 degrees Celsius or 41 degrees Fahrenheit. Wind was mild. SQML reached 21.08. Seeing was bad, and guide error RMS was around 3" at the low elevation in the sky as you see the bloated stars on the frame. Result of imaging looked better after the beginning of twilight. Elevation was 8.5 degrees at the beginning and 18.3 degrees above horizon at the end in twilight.

Here is a frame of the site at the night.
www.flickr.com/photos/hiroc/52531385750/in/photostream/

N 27 B 462 C 0 E Nov 18, 2022 F Nov 24, 2022
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I tried GSO RC10f8 again after addition of TS Extension for The Baffle Tube. Stray lights disappeared. I could have finished refinement of the OTA twelve years after purchase. I hope to image nebulae and comets with this one.

TS Optics Extension for the Baffle Tube of 10" RC Telescopes:
www.teleskop-express.de/shop/product_info.php/language/en...

Here is a view of the OTA with TS extension:
www.flickr.com/photos/hiroc/52504139488

Here is a frame of the object taken with the OTA with no extension:
www.flickr.com/photos/hiroc/52490891703

equipment: Guan Sheng Optical Ritchey–Chrétien telescope RC 10" f8 with aigrette pattern mask on the vanes, TS 2.5" field flattener and Canon EOS R-SP4II, modified by Seo-san on Vixen AXD Equatorial Mount, auto guided at a star with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, GPUSB, and PHD2 Guiding

exposure: 15 times x 120 seconds, 18 x 30 sec, 20 x 8 sec, 20 x 4 sec, and 20 x 2 seconds at ISO 1,600 and f/8.0

site: in my backyard at the bottom of almost the center of the world worst light pollution dome over Tokyo

N 19 B 625 C 3 E Nov 8, 2022 F Nov 22, 2022
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I could enjoy the super rare event in Tokyo. It was clear and calm.

I followed the star field with the equatorial mount.

The moon was low in the east, when the eclipse began. The moon went up due to the rotation of Earth and drifted toward east northeast in the field of stars in Aries due to the revolution of Moon. Uranus was the brightest in the frame. Duration of the total lunar eclipse was long. Lunar occultation of Uranus was near the end of the total lunar eclipse. Tokyo was near the east limit of the event. Uranus came out from behind the moon, after the end of total lunar eclipse. Moon went up and got brighter than that at the beginning.

Moon looks reddish dark like salmon roe, ikra イクラ up in the sky while total lunar eclipse, and it has bluish part near the edge around the beginning and the end of total lunar eclipse. It is called as "Turquoise Fringe," which is said to be made by ozone layer of Earth.

Umbra, the shadow of Earth also drifted slowly toward west northwest during the eclipse due to the revolution of Earth, and it looks not strictly circular but skewed a bit in this perspective.

Here is a short 4K movie composed of more than 2,000 frames:
youtu.be/gmaREZwZ2VI

Next lunar occultation of planet (Neptune) during total lunar eclipse is in northern Pacific and Arctic Ocean area on December 21, 2037.

equipment: Takahashi FOA-60, extender 1.7xR, Canon EOS R-SP4II, modified by Seo-san on ZWO AM5 Equatorial Mount, auto guided at a star nearby with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, GPUSB, and PHD2 Guiding during total lunar eclipse.

exposure: 1/1000 seconds - 4 seconds at ISO 1,600 and f/15

site: on the roof of 7-layered building in Tokyo


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