Search found 340 matches

by hhzhang
Mon May 10, 2021 9:27 pm
Forum: Astrophotography
Topic: My Update
Replies: 3
Views: 56

Re: My Update

Decent quality deep-sky pictures despite pretty short integration times. Well done!
by hhzhang
Mon May 10, 2021 11:46 am
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

Now the question is this: when do you think Eunomia will catch up with Hygiea (same RA)? Don't use any tools. Just guess!
by hhzhang
Mon May 10, 2021 11:33 am
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

2021-5-3 to 5-9 Tracking two large asteroids in apparently co-motion across the M44 field. Turns out a good chance to examine Keppler's third law, just approximately. Given the semi-major axis is 2.643 for Eunomia and Pi for Hygiea, the ratio between the orbital periods is 1.296. Measuring the two l...
by hhzhang
Mon May 10, 2021 11:21 am
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

Dragon Man wrote: Sun May 09, 2021 6:07 pm Absolutely beautiful images [smilie=admire.gif]

Well done Image
Thank you for the nice words!

This is my favorite hobby. No matter how many disadvantages here in Singapore.
by hhzhang
Sun May 09, 2021 11:41 am
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

Sun rises in full power.

Image
by hhzhang
Sun May 09, 2021 11:39 am
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

2021-5-9

Cresent moon just passed the mag6.5 star 35 Cet.

Image
by hhzhang
Fri May 07, 2021 10:53 pm
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

2021-5-7 A wait too long for a glimpse of Mercury's return to the western night sky Bad weathers since Mercury had returned to the western dusk/night sky. Today it finally showed up through the gaps of clouds. https://lh3.googleusercontent.com/pw/ACtC-3eDVPVtpeNz05cCdYhucIEF-8tXenC13dHhQfarrFzugHDsw...
by hhzhang
Fri May 07, 2021 10:49 am
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

2021-5-7 Morning Moon

Image
by hhzhang
Thu May 06, 2021 5:57 pm
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

The most important cosmology astrophoto ever taken, by Edwin Hubble. .... and my discovery of something. It is always in the original negative plate format -- black-white turns white-black. So I was just curious how it would look like in true black-white. After the invert, it looks like a better pic...
by hhzhang
Thu May 06, 2021 3:16 pm
Forum: Astrophotography
Topic: My astrophotography 2021
Replies: 149
Views: 8269

Re: My astrophotography 2021

2021-5-6 The currently brightest comet C/2020 R4 was passing the Whale Galaxy Group field in the constellation of Canes Venatici. The encounter happened at around 2AM UTC -- Singapore's day time. No choice but to schedule a remote telescope task on SkyGems for the time -- but from that remote observ...