Paul Leyland

@brnikat.bsky.social

630

Posts

General purpose scientist, amateur astronomer. Aspie into most anything technical.

Pedantry is something up with which I will always put.

Down, not across.

http://astropalma.com

Posts Replies Media

🔭 This is NGC 2623, a magnitude 13.4, SABcd LINER galaxy seen face on. Taken with my 0.4m Dilworth, 3180s unfiltered, in 106 subs on 2023-03-10. The object close to the nucleus is another galaxy. Limiting stellar magnitude is ~20.4, not much brighter than the DSS2 images available at Aladin.

🔭 ESO 456-78 is a fairly bright (mag 11) globular cluster in Sagitarrius lying in dense star clouds. In this image taken with my 0.4m Dilworth, the dense nucleus of the GC is the circular smudge to left of centre. Its other members are all over the image and some are beyond its boundaries.

🔭 (55565) 2002 AW197 is a V=20.0 TNO 44.9 AU away in March 2023 when this 5460s stack was taken with a SX814 on my 0.4m Dilworth. Noise reduction by FABADA and contrast stretching by ds9 and ImgeMagick. Some sky noise is still visible because the TNO is only half as bright as the background sky.

Here are seven globular clusters orbiting the Triangulum galaxy, aka Messier 33. They are 18th and 19th magnitude. 1350s unfiltered SX 814 camera, 0.4m Dilworth telescope. Taken 2022-09-05

🔭 This is Palomar 5, a faint and sparse globular cluster in Serpens. It was first thought to be a dwarf spheroidal galaxy and was catalogued as UGC 9792. A number of much brighter stars lie in front of the GC. 2760s in 47 subs unfiltered SX814 on a 0.4m Dilworth.

🔭 Here is comet 29P/Schwassmann-Wachmann as it appeared on 2023-01-14. Not entirely sure why it wasn't posted much earlier. Exposure of 930 seconds (31x30s subs) through a Johnson V filter, SX 814 camera on a 0.4m Dilworth.

Reply to

Paul Leyland

The starless images were stacked to make a impromptu flat which was applied to the remaining images, shown here. Identifying the stars is difficult but, fortunately, the left one shows a double star. Knowing the plate scale and camera orientation I could estimate the PA and separation. 3/n

Reply to

Paul Leyland

Here are the images showing the double star and 26 Tau. You can see how well the impromptu flats have worked. End of thread.

Reply to

A. Suárez Mascareño

Here's mine. Perhaps you see why I describe myself as a general purpose scientist. 🧪🔭⚒

Reply to

Alexandre Adler

Just look at the sheer beauty of the mount of this telescope.

Reply to

Sergio 📷🔭🌲

Well done getting the jet. It's low contrast against the bright background light from the stars. Here is my version, in false colour to emphasize the contrast.

Reply to

Casey Jennings

If you want a nice shot, here's one I took earlier of AF And. Measured at V=15.71 on 2024-01-22 so it ought to have been a visual object with a 0.5m. This was actually a stack of 1400 seconds exposure with my 0.4m. It took that long so that the error in the measurement was only 0.03 magnitudes.

Reply to

David Blanchflower BSc

Afternoon Moon. 1508 UT 16 February 2024 🔭🧪 #astrophotography. Wait for it ...

Afternoon Pleiad. 1531 UT 16 February 2024 🔭🧪 #astrophotography. 60ms exposure through a Sloan i' filter. Not yet sure which star in Messier 45 it is. I found several more by slewing around at random. The dust donuts indicate I need to take some fresh flats again.

Reply to

Paul Leyland

Ah, I forgot another example: stellar proper motion. A notorious example is Barnard's star which is moving at over ten arc seconds per annum. Here is my time lapse image from 2019-2023 with one frame taken each summer.

Wow! How's about that Guys and Gals for lenticular clouds? This is just a few of those visible right now from El Paso, La Palma

Guy Hurst is editor of The Astronomer magazine and asteroid 3697 Guyhurst is named for him. This a stack of 52x40s exposures taken on 2024-02-01 with my 0.4m. The trail of 3697 is at centre. The Seyfert galaxy at lower-right is mag 16.07 and 3697 about 17th magnitude. #astrophotography #astronomy

Reply to

Coach Jerry (referee 🟥)

Looks rather derivative to me. Compare with this BBC report on an entry to a competition to design a logo for the 2012 London Olympics.

M5 is a globular cluster in Serpens. It is quite bright and is just about visible to the naked eye on exceptionally clear and dark nights. It has about 100 variable stars known and V42 is marked on this image. Taken 2021-07-02 with a35s exposure by a SX-814 CCD camera on a 0.4m Dilworth reflector

Reply to

Dan Yocum

You like boobies? Here you are then.

Reply to

Maggie Astor

Here you are. Roach marked by red cross lines. It's only a few pixels at this scale.

Reply to

Theresa Davis

Drop something blue from your gallery

Like this, for instance?

Reply to

Paul Leyland

Here you are:

So I downloaded Fabada (github.com/PabloMSanAla...) yesterday and have been playing with it. For some images the noise reduction is astounding! The screen shot shows a 30-second sub of a star field containing (846) Lipperta. 171 iterations took 23.4s.

Here are 6 globular clusters in NGC 253 a galaxy in Sculptor. They are 11.4 Mly away, so well outside the Local Group. Their g magnitudes range from 20.32 to 21.12. 1560s exposure on a 0.4m Dilworth. One day I'll image the rest of the field and look for some of the other 76 confirmed GCs

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