13 replies to this topic

[cometchaserde]

Hi,

I imaged the new Nova Lup 2025 yesterday remote from Namibia.

 

https://www.cometcha...5_16062025.html

 

 

Stefan

[KShank]

Taken 17/18 (UT). 

Very low for me (15 from horizon) with AM- 2.54.   Rough data but that is at the meridian...

Keith

 

[Olivier_Garde]

A spectrum taken from Chili with our 2SPOT setup (Echelle spectrograph R=11000 + ATIK 460Ex CCD camera and a RC 12') : 5 x 1200 s

 

And a detail on H alpha line to estimate the ejecta velocity

 

 

A raw echelle spectrum

Attached Thumbnails

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Edited by Olivier_Garde, 19 June 2025 - 12:07 PM.

[Dave Mitsky]

NAKED-EYE NOVA IN THE SOUTHERN HEMISPHERE: A star in the southern constellation Lupus exploded on June 12th and since then has brightened rapidly. Dawid Moździerski, who photographed the nova from the Atacama desert of Chile, says "it is now at magnitude +5.7," just above the threshold for naked-eye visibility.

 

The nova, named V462 Lup, is an old-fashioned "classical nova." First documented by Chinese astronomers some 2000 years ago, these explosions occur in binary star systems. White dwarf stars steal gas from a bloated partner until the stolen fuel ignites in a sudden thermonuclear blast.
 

Novas that reach 6th magnitude are uncommon. They appear no more than once a year, and most are so close to the limit of naked-eye sensitivity that they can be invisible despite being technically "naked-eye." Will V462 Lup continue to brighten and clear this low bar? Or fade before most people can see it? Stay tuned!
 

https://www.spacewea...th=06&year=2025

https://spaceweather..._1750265329.jpg

[KShank]

 

Great high res from Olivier and over head instead of very low like I have.   

 

Here is a lower resolution update (R-1000).

Since I am doing relative flux cannot really tell if the FE2 lines are dimming or the system overall is brightening.   But some clear changes in relative flux seen in addition the Hb line is 'gone'.   Again, relative flux so since the object is getting brighter, may be only the other lines are increasing.

 

Observation on 17,18,19 UT....

 

 

 

Instrument - C14Edge + AP .67focal reducer - F/7.6  LISA spectograph, SX825 Pro science cam.  15x100sec exp.  Ref star - HD129685 (AOIV).   AirMass ~3.16.

keith

[rjacks]

Observing from SQM 20.2 at 34 degrees north under good transparency 2 hours after sunset on June 19, this nova was an easy naked eye object for me. I have no experience estimating star magnitudes, but this nova was naked-eye obvious.

 

For me, the AAVSO website was not recognizing V462 Lupi this morning, so I can't find a light curve for this nova.

[Olivier_Garde]

Evolution of this nova in one day on H Alpha and sodium lines

 

 

[RobboK]

Here's a montage of low-res spectra of the nova taken over 5 successive nights from Australia, 18 - 22 June 2025. Interesting to see the emissions begin to show through from the essentially flat spectrum in the first three, especially H-beta changing from absorption to emission. The spectra were fairly noisy so there's a lot of random 'lines' as well.

 

Cheers -

 

Rob

 

[KShank]

Have had a few days of bad skies here but last night opened up.   Wow the balmer lines lit up!

 

C14E+LISA @f/7.6 100 sec x 15 using HD129685 ref.     

 

Keith

 

[robin_astro]

Here's a montage of low-res spectra of the nova taken over 5 successive nights from Australia, 18 - 22 June 2025.

Here is another bright probable nova for you Rob. This one is in Vela.

 

http://www.cbat.eps....00-5331109.html

 

You are making us northerners jealous ;-)

[KShank]

Overnight decrease in Balmer energy.   May not be able to get data tonight as we have storms followed by a Saharan dust cloud arriving in the next 24 hrs....

 

keith

 

[GeoffMc]

Here's a calibrated and normalised spectrum obtained with MSATT. Comments/criticisms welcome!
 
MSATT 2: 40cm f4 Newtonian, Alpy spectrograph.

 

Cheers,

 

Geoff Mc

Attached Thumbnails

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[Olivier_Garde]

Evolution of Nova Lup 2025 in one week (one spectrum per night) on H alpha line (but of cours others line "move").

 

And an animation with our spectra

Edited by Olivier_Garde, 29 June 2025 - 03:45 AM.

[Olivier_Garde]

Our 2SPOT team is continuing to follow this nova from Chile with an eShel spectrograph (R=11000).

Here's the evolution of this nova on the H Alpha line with the 21 Spectra we've produced to date

 

the evolution of iron lines (between 5120 and 5300 Å)

 

And the evolution of the D1 D2 lines and the Helium I 5876 line

 

 

Its current magnitude still allows us to track it with the echelle spectrograph.