Forum Replies Created
-
Posts
-
Just had a heads up from Tom Killestein. It’s bounced again. mag 15, up from 17.4 this morning
Robin
note the default setting only gives the location in deg,min,sec to one second resolution. If you need higher resolution switch to decimal degrees (tools ,settings, formats and units, lat lon format, decimal) this then give the location in degrees to 6 decimal places (less than a metre)
EDIT, looking at some papers on this the actual absolute accuracy though is probably more like 5-10m in position and a couple of metres in elevation
Cheers
RobinHi Jack,
I recently had to do this for a meteor camera installation, needed to a couple of metres accuracy. The recommendation was Google Earth
https://earth.google.com/
Zoom into your exact location, right click and click info in the pop up boxCheers
RobinA spectrum time series showing the variation in the various emission lines during this event
Cheers
RobinHere’s the Celestron version.
https://www.celestron.com/cdn/shop/products/93665_NexStar_Wedge_6_570x380@2x.jpg?v=1590984227
Looks like a heck of a bending moment on the arm thoughOr fit a field rotator before the camera
Or a wedge provided the software recognises this equatorial mode
A few more spectra, the latest one at higher resolution with the ALPY600 (missed the fade unfortunately)
Cheers
RobinAttachments:
Great capture Bill.
Things have certainly moved on from my one (and only) attempt at this nearly 20 years ago
http://www.threehillsobservatory.co.uk/astro/spectra_20.htmIt is interesting to try to compare Nick’s time lapse with what was seen at the same time from 400km further north, now archived at
http://threehillsobservatory.co.uk/allsky_camera/allsky_20241010_aurora.mp4
(South is to the left, west is up)
The short intense burst at ~21:02 corresponds to a bright band briefly appearing to the south in my camera and the other intense period ~23:15-23:35 coincides with when it shifted from north to overhead and south hereCheers
RobinThe weakness of the Swan band emission does confirm earlier observations that it is a carbon depleted comet eg
https://www.astronomerstelegram.org/?read=16637Cheers
RobinHi David,
What was the orientation of the slit relative to the comet? The sodium emission line is seen only on one side of the coma so presumably is from the sodium tail rather than any light pollution/atmospheric emission line
Cheers
RobinIf you zoom in you will find Comet 13P/Olbers
I had noticed that conjunction in CdC and wondered if anyone would get them in the same frame. Impressive image !
Robin
Be careful if using MELCHIORS spectra. I have studied a few and found two suspect spectra already so there may be more
HD205021B is the wrong star
HD180482 (22 Aql) has the wrong continuum shape
See
https://www.spectro-aras.com/forum/viewtopic.php?t=3148Cheers
RobinOh Dear, I see BBC Lead Weather Presenter Simon King is suggesting looking for the comet tonight “Around Sunset at 18:00-18:30 BST”.
https://www.bbc.co.uk/weather/articles/cq5e6jne670o
There is going to be a lot of disappointed people giving up at 18:30 when they could have had a nice view an hour later! There is a Twitter (x) link but I don’t use that. Anyone care to put him straight on this?Cheers
RobinAn ALPY200 spectrum from 20241010 (with severe auroral line contamination removed) confirms the typical features of a dwarf nova in outburst as described in ATel 16858
Cheers
RobinAttachments:
Clear here most of the night and spectacularly dynamic, particularly for about an hour around 23:00 UT. Captured on the all sky camera where the image to the north was saturated most of the time
http://www.threehillsobservatory.co.uk/allsky_camera/allsky_camera_page.htm
here is a single frame teaserCheers
RobinAttachments:
You can do it with a fixed mount using the natural sidereal motion to drift the sun across the slit as I experimented with here with my LHIRES
http://www.threehillsobservatory.co.uk/astro/spectra_29.htm
With Buil’s other instrument the SolEx, it is essentially a high resolution spectrograph which is mounted on a telescope and the mount is normally driven at x times sidereal, taking advantage of improvements in camera sensitivity and speed to reduce the scan time so the result is less reliant on stable conditions. The details of this device are yet to be revealed thoughSpectrum from 27th Sept
https://britastro.org/specdb/data_graph.php?obs_id=17144
very different from published spectra in quiescence eg
https://skyserver.sdss.org/dr17/en/get/SpecById.ashx?id=8671752135506155520Also picked up by MASTER yesterday at mag 13.6 (clear)
https://www.wis-tns.org/object/2024xhnThere is another PNV from 4 days ago around the same magnitude with no confirmation as yet
http://www.cbat.eps.harvard.edu/unconf/followups/J06393680+1604070.html
https://www.wis-tns.org/object/2024xdm
