Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

R Leonis observed

  • Please log in to reply
109 replies to this topic

#101 Rutilus

Rutilus

    Soyuz

  • *****
  • Posts: 3,732
  • Joined: 17 Dec 2010

Posted 31 May 2023 - 09:01 AM

But please forgive me when I ask you of your opinion of other estimates that have been made on www.aavso.org by probable amateur astronomers. 

It seems that most observers get a different magnitude when compared to you and me. 

Some are using binoculars; whereas others refuse to inform us of their instrument.

Ignoring those who use a V filter, their estimated magnitudes hugely vary between +5.7 to +7.1 over the last 7 days.  

Hi Aubrey - To see such a difference in reports on the brightness of  LPV  stars is to be fully expected,

as each observer will have their own personal equation. I think it's just coincidence that are recent observations are 

very similar.

Years ago when I was doing a lot of variable star work, my own personal equation was around 0.3 mag. i.e. I would 

report an estimate that would be 0.3 mag  (average) brighter than the ten-day mean of a  preliminary light-curve

of the LPV star under observation. I have no idea what it might be today, or if it has changed over time as I have aged.

Maybe when I have the time I could sit down and do a lot of number crunching to find out, however I'm not doing

the level of variable star work (estimating) that I was some 30 years ago.

 

Back in the day, I remember light-curves being produced from weighted observations, these would help smooth 

out some of the variations in the light-curves.

  

 

.


Edited by Rutilus, 31 May 2023 - 09:09 AM.

  • jim kuhns, flt158 and KMA like this

#102 Rutilus

Rutilus

    Soyuz

  • *****
  • Posts: 3,732
  • Joined: 17 Dec 2010

Posted 03 June 2023 - 07:08 AM

I've had to build a pier mount, to allow me to get to different parts of the garden to carry on observing R Leo. 

Tried it out last night and got the image below. Estimated the brightness at around mag.6.5.

Over the next few weeks it will become harder for me to observe, due to trees (not mine) around my garden.

 

Also managed an image of S CrB, which appears to be increasing in brightness. I plan to follow this star over the summer 

to try and get an record of its rise to maximum brightness. Both images taken with my achromat refractor.

 

Attached Thumbnails

  • R-Leo-02-06-2023.jpg
  • S-CrB-02-06-2023.jpg

  • jim kuhns, flt158 and KMA like this

#103 KMA

KMA

    Vostok 1

  • -----
  • Posts: 125
  • Joined: 24 Oct 2018

Posted 04 June 2023 - 09:16 AM

Nice pictures Rutilus

and you are correct with brightening of S CrB.

Another news in CrB constellation is 

R CrB declining after a long time of max.

My last night report to AAVSO is 7.0m visual.

R Leo is now too far west for me.....

Best wishes for clear sky

KMA


  • jim kuhns and flt158 like this

#104 Rutilus

Rutilus

    Soyuz

  • *****
  • Posts: 3,732
  • Joined: 17 Dec 2010

Posted 14 October 2023 - 06:27 AM

R Leo is now visible in the pre-dawn sky, just above the rooftops from my location.

In the eyepiece of my C9.25 SCT, it appears to be around minimum brightness.

Took these single 6 seconds exposure frame images with the SCT, in a Bortle 8 sky.

Attached Thumbnails

  • R-Leo-14-10-2023.jpg

  • flt158 and KMA like this

#105 KMA

KMA

    Vostok 1

  • -----
  • Posts: 125
  • Joined: 24 Oct 2018

Posted 19 October 2023 - 06:53 AM

Although U Gem was my main star to observe

this morning (outburst)

I did also reported on R Leo

and it is now at minimum.

 

regards

KMA


  • Rutilus and flt158 like this

#106 Rutilus

Rutilus

    Soyuz

  • *****
  • Posts: 3,732
  • Joined: 17 Dec 2010

Posted 26 November 2023 - 08:37 AM

Taken yesterday, and R Leo seems to be slowly awakening from its minimum brightness.

Magnitude around 10.0 - 10.3.

Attached Thumbnails

  • R-Leo-25-11-2023-com.jpg

  • flt158 and KMA like this

#107 Rutilus

Rutilus

    Soyuz

  • *****
  • Posts: 3,732
  • Joined: 17 Dec 2010

Posted 15 January 2024 - 09:30 AM

R Leo was very easily seen in the eyepiece of the 7x50 finder scope this morning. Magnitude around 8.0.

Took an image with a 70 year old Wray enlarging lens.  Regulus is far left with omicron Leo far right.

Also managed to capture S Ori which seems to be a tenth magnitude object at the moment.

Attached Thumbnails

  • R-Leo-15-01-3024.jpg
  • S-Ori-15-01-2024.jpg

  • flt158 and KMA like this

#108 flt158

flt158

    Soyuz

  • *****
  • topic starter
  • Posts: 3,689
  • Joined: 11 Aug 2014
  • Loc: Dublin, Republic of Ireland

Posted 25 January 2024 - 03:38 PM

I'm sorry to be out of action these days. 

I'm due to have a heart operation very soon. 

It is routine though. 

Therefore I will be looking forward to observing R Leonis again later in 2024. 

 

In the meantime, I must thank our friend Rutilus for his latest images of R Leonis and S Orionis. 

 

Clear skies from Aubrey. 



#109 KMA

KMA

    Vostok 1

  • -----
  • Posts: 125
  • Joined: 24 Oct 2018

Posted 26 January 2024 - 05:26 AM

Best wishes Aubrey

KMA


  • Rutilus and flt158 like this

#110 Rutilus

Rutilus

    Soyuz

  • *****
  • Posts: 3,732
  • Joined: 17 Dec 2010

Posted 29 January 2024 - 03:04 PM

Aubrey - Looking forward to seeing your observations later in the year.


  • flt158 likes this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics