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C/2024 G3 in outburst? - Jan 2.76, 2025 UT

terryjlovejoy All Messages By This Member #33199 I just got back from observing C/2024 G3 from a nearby bayside location in Brisbane.? This comet has been very elusive visually in 50mm binoculars due to its low elevation in twilight, but this morning I was very surprised to clearly see it binoculars complete with short tail.? Comparison with nearby 45 Oph suggested the comet's magnitude was in the 3's and subsequent photometry from the G channel using similar elevation stars confirmed a brightness of mag 3.7.? TIme of observation was 2025 Jan 2.76 UT.
Taras Prystavski All Messages By This Member #33200 Hi Terry and all, My observation made earlier the same day using a remote T75 telescope in Chile didn't show anything suspicious. Just a regular brightening. Magnitude 4.7. Comet C/2024 G3 (ATLAS) 2025 Jan. 02.36 UT ?m1=4.7: Dia.=&2.0' Tail=&19.3' in PA 242 deg... [T75] 0.25-m f/3.8 Newtonian reflector + CMOS... T. Prystavski (iTelescope observatory, X07 (remotely from Rio Hurtado Valley, Chile)) [morning twilight: Sun alt. -12 deg] ? ?2024G3 ?2025 01 02.36 ?C ?4.7:U4 25.0L 4a ?5 & 2.0 ? ? &19.3m242 ICQ XX PRY01I ? ? C 1.98m ? ? ? ?A4B 5 U9 ? ? ? ? ? ?1.8s 1.8 best regards and clear skies, Taras чт, 2 с?ч. 2025?р. о 22:31 terryjlovejoy via <terryjlovejoy=[email protected]> пише: toggle quoted message Show quoted text I just got back from observing C/2024 G3 from a nearby bayside location in Brisbane.? This comet has been very elusive visually in 50mm binoculars due to its low elevation in twilight, but this morning I was very surprised to clearly see it binoculars complete with short tail.? Comparison with nearby 45 Oph suggested the comet's magnitude was in the 3's and subsequent photometry from the G channel using similar elevation stars confirmed a brightness of mag 3.7.? TIme of observation was 2025 Jan 2.76 UT. -- best regards and clear skies, Taras calibrated-T75-prystavski-CK24G030-20250101-054026-Luminance-BIN2-E-010-001+9_caption.jpg
Nick James All Messages By This Member #33203 I've just measured an image from T70 in Chile (135mm FL lens) taken this morning at 2025-01-03T08:43:24 and the comet is now saturated in a 10s exposure. I get mag 3.0 but this will be an underestimate due to the saturation. Unfortunately, I didn't think to program any shorter exposures. My last measurement with the same equipment, exposure and software was 4.6 at the same time yesterday. This might be bad news... Nick.
Alexandre Amorim All Messages By This Member #33205 Dear friends ? Follow my observation: magnitude 2.0 (extinction applied) Using 10x50 B ? Comet's altitude 6 deg Sun's altitude -9 deg ? Comet visible through 6x30 finderscope until altitude 11 deg, Sun at -5 deg. ? Comet visible through 90mm f/10 refractor (eyep. 25mm) until 12 deg, Sun at -4 deg. ? A single photo is available here: ? with regards ? A. Amorim (Florianopolis/SC, Brazil)
Alexandre Amorim All Messages By This Member #33206 Visual observation was in 3jan 2025 at?07:40 UT.
Mikolaj Kaszczyk Member Profile All Messages By This Member #33207 If you could compare it to Comet Tsuchinshan-ATLAS, how nice object is it?
Michael Mattiazzo All Messages By This Member #33209 开云体育 Folks, ? I concur with Alexandre’s obs that the comet is in outburst (1.5 to 2 mag amplitude) as reported by T. Lovejoy. C/2024 G3 ATLAS on 2025 January 3 at 18:10UT. Location Swan Hill An estimate using 8x40mm binoculars was m1=2.0 with a strongly condensed 3' coma and 15' tail in PA250. Magnitude corrected for atmospheric extinction using the average table. In 15x70mm binoculars, a prominent dark lane or nuclear shadow is visible, indicating a recent outburst has occurred. Comet altitude 6 degrees. Sun altitude -12 degrees Clear conditions. Barely detectable with the naked eye. Comparisons: Mercury (-0.4), Theta Oph (3.2), 3 Sgr (4.6) Comet was still visible when Sun -8 degrees below horizon. Images attached. This reminds me of C/2000 WM1 LINEAR, here are my recollections of it: ? Cheers, Michael (Swan Hill, Australia) 35S 143E ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Alexandre Amorim via groups.io Sent: Friday, 3 January 2025 10:38 PM To: [email protected] Subject: Re: [comets-ml] C/2024 G3 in outburst? - Jan 2.76, 2025 UT ? Dear friends ? Follow my observation: magnitude 2.0 (extinction applied) Using 10x50 B ? Comet's altitude 6 deg Sun's altitude -9 deg ? Comet visible through 6x30 finderscope until altitude 11 deg, Sun at -5 deg. ? Comet visible through 90mm f/10 refractor (eyep. 25mm) until 12 deg, Sun at -4 deg. ? A single photo is available here: ? with regards ? A. Amorim (Florianopolis/SC, Brazil) 2024g3_20250103_1810ut_mattiazzo2.jpg 2024g3_20250103_1803ut_mattiazzo1.jpg
Alexander Balashov All Messages By This Member #33210 Hello all. Can anyone here process a c/2024 g3 photo using rotational gradient filter?
Lucas Camargo da Silva All Messages By This Member #33211 开云体育 Dear all, This morning I made a successful naked eye observation of comet C/2024 G3 from a very dark site in Lages, SC, Brazil. 2025 Jan. 04.32 UT: m = 1.9, DC = 9, tail = 0.5° in PA 255°. Comet altitude: 4°. Sun altitude: -11°. Comparison stars from BSC, atmospheric extinction from ICQ Table Ia. "Average" applied. Best regards, Lucas Camargo da Silva NEOA-JBS Florianópolis, SC, Brazil De: [email protected] <[email protected]> em nome de Michael Mattiazzo via groups.io <mmatti@...> Enviado: sexta-feira, 3 de janeiro de 2025 21:11 Para: [email protected] <[email protected]> Assunto: Re: [comets-ml] C/2024 G3 in outburst? - Jan 2.76, 2025 UT ? Folks, ? I concur with Alexandre’s obs that the comet is in outburst (1.5 to 2 mag amplitude) as reported by T. Lovejoy. C/2024 G3 ATLAS on 2025 January 3 at 18:10UT. Location Swan Hill An estimate using 8x40mm binoculars was m1=2.0 with a strongly condensed 3' coma and 15' tail in PA250. Magnitude corrected for atmospheric extinction using the average table. In 15x70mm binoculars, a prominent dark lane or nuclear shadow is visible, indicating a recent outburst has occurred. Comet altitude 6 degrees. Sun altitude -12 degrees Clear conditions. Barely detectable with the naked eye. Comparisons: Mercury (-0.4), Theta Oph (3.2), 3 Sgr (4.6) Comet was still visible when Sun -8 degrees below horizon. Images attached. This reminds me of C/2000 WM1 LINEAR, here are my recollections of it: ? Cheers, Michael (Swan Hill, Australia) 35S 143E ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Alexandre Amorim via groups.io Sent: Friday, 3 January 2025 10:38 PM To: [email protected] Subject: Re: [comets-ml] C/2024 G3 in outburst? - Jan 2.76, 2025 UT ? Dear friends ? Follow my observation: magnitude 2.0 (extinction applied) Using 10x50 B ? Comet's altitude 6 deg Sun's altitude -9 deg ? Comet visible through 6x30 finderscope until altitude 11 deg, Sun at -5 deg. ? Comet visible through 90mm f/10 refractor (eyep. 25mm) until 12 deg, Sun at -4 deg. ? A single photo is available here: ? with regards ? A. Amorim (Florianopolis/SC, Brazil)

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