Monday, August 3, 2020

New Comet C/2020 O2 (Amaral)

CBET 4822 & MPEC 2020-P10, issued on 2020, August 02, announce the discovery of a comet (magnitude ~18) by Leonardo S. Amaral (Rio de Janeiro, Brazil) on three 60-s CCD exposures taken on July 23 with a 0.3-m f/4 reflector. The new comet has been designated C/2020 O2 (Amaral).

We performed follow-up measurements of this object while it was still on the PCCP webpage.

Stacking of 16 unfiltered exposures, 90 seconds each, obtained remotely on 2020, July 27.05 from X02 (Telescope Live, Chile) through a 0.6-m f/6.5 astrograph + CCD, shows that this object is a comet with a diffuse coma about 8" in diameter (Observers E. Guido, M. Rocchetto, E. Bryssinck, M. Fulle, G. Milani, C. Nassef, G. Savini, A. Valvasori).

Our confirmation image (click on it for a bigger version)



Discovery image

Credit: L. S. Amaral (OCA)


MPEC 2020-P10, assigns the following preliminary parabolic orbital elements to comet C/2020 O2 (Amaral): T 2021 Aug. 23.84; e= 1.0; Peri. =  9.39; q = 4.90;  Incl.= 71.89

Congrats to Leonardo Scanferla Amaral (Observatório Campo dos Amarais, OCA) for this discovery! This is the fourth amateur comet discovery of 2020.

by Ernesto Guido

Friday, July 17, 2020

BRIGHT NOVA RETICULI 2020

Following the posting on the CBET 4811 & 4812 about the NOVA RETICULI 2020 we performed some follow-up of this object through a TEL 0.1-m f/3.6 astrograph + CCD located in the Heaven's Mirror Observatory, Australia (MPC code Q56) and operated by Telescope Live network.

On images taken on July 16.82, 2020 we can confirm the presence of an optical counterpart (with R-filtered magnitude about +4.5; B-filtered magn. +5.6; V-filtered magn. +5.6) at coordinates:

R.A. = 03 58 29.61, Decl.= -54 46 39.8

(equinox 2000.0; Gaia DR2 catalogue reference stars for the astrometry).

This transient was discovered by Robert H. McNaught (Coonabarabran, NSW, Australia) as an apparent 5th-magnitude nova on CCD images obtained on July 15.590 UT with a Canon 6D camera and an 8-mm-f.l. f/2.8 lens (at ISO 800). The position is very close to an object listed as "MGAB-V207" in the AAVSO's VSX online database (which gives position R.A. = 3h58m29s.55, Decl. = -54d46'41".2, equinox J2000.0, which calls it a novalike "VY Scl"-type variable with V magnitude range 15.8-18.0).

Spectroscopy by E. Aydi et al. (ATel #13867) using the High Resolution Spectrograph (HRS) mounted on the 11m Southern African Large Telescope as part of the SALT Large Science Program on Transients shows a spectrum that resembles that of a classical nova, likely after optical peak. Also, R. Kaufman (Bright, VIC, Australia) reports a low-resolution spectrum obtained by him on 2020 Jul. 16.62 UT (with a Canon 800D camera + 200-mm-f.l. f/3.5 lens) indicates the object to be a "Fe II-type" classical nova.

According to ATel #13868 "the positional coincidence of the optical/gamma-ray transient with the previously known VY Scl-type cataclysmic variable (d = 2.7 kpc from Gaia DR2; Bailer-Jones et al. 2018) suggests that the transient is a Galactic nova, which was confirmed with SALT spectroscopy (ATel #13867). It is only the third time that a classical nova eruption is observed in a previously known white dwarf hosting binary after V407 Cyg (ATel #2487) and V392 Per (ATel #11590), which were also detected by Fermi-LAT."

According to Cbet 4812 "the following pre-discovery V magnitudes from all-sky video images taken by M. A. Phillips at the Edward Pigot Seismic Observatory, Coonabarabran, using a ZWO ASI178MC-COOL color CMOS camera and a 1.4-mm-f.l. f/1.8 fish-eye lens: July 6.81, [6.0; 7.79, [5.5; 8.78, 5.4; 11.76, 3.7; 12.8, 3.8; 13.83, 4.0; 14.8, 4.4; 15.8, 4.7.  No variability was seen on single nights.  Further CCD magnitudes reported by McNaught from his images:  June 30.727, [9.8; July 1.763, [9.9; 2.826, [8.8; 15.747, 5.1; 15.785, 5.1; 15.804, 5.1. 

P. Schmeer, Bischmisheim, Germany, reports the following g magnitudes for the nova from the ASAS-SN Sky Patrol:  July 2.183, 16.6; 2.186, 16.3; 4.189, 15.5; 8.173, 6.8.  Schmeer adds that no previous outbursts or eruptions were recorded in ASAS-SN patrol images since 2014 June 18."


Below our confirmation image. Click on the image for a bigger version: 



An animation showing a comparison between my image and the archive POSS2/UKSTU Red plate (1993-12-17). 



by  Ernesto Guido, Marco Rocchetto & Adriano Valvasori

Wednesday, June 17, 2020

New Comet C/2020 K8 (CATALINA-ATLAS)

CBET 4796 & MPEC 2020-L46, issued on 2020, June 12, announce the independent discovery of a comet (magnitude ~19) of an apparently asteroidal object made on CCD images taken with the 0.68-m Schmidt telescope of the Catalina Sky Survey (on May 25, 28, and 29) and the 0.5-m f/2 Schmidt reflector at Haleakala, Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program (on June 7). Then on June 8, R. Weryk reported the linkage of all of these tracklets, suggesting it might possibly be a comet based upon the astrometry. The object has been found to show cometary appearance subsequently by numerous CCD astrometrists at other observing sites after the object was posted on the Minor Planet Center's PCCP webpage. The new comet has been designated C/2020 K8 (CATALINA-ATLAS).

We performed follow-up measurements of this object while it was still on the PCCP webpage.

Stacking of 29 unfiltered exposures, 60 seconds each, obtained remotely on 2020, June 09.4 from X02 (Telescope Live, Chile) through a 0.6-m f/6.5 astrograph + CCD, shows that this object is a comet with a diffuse irregular coma about 10" in diameter (Observers E. Guido, M. Rocchetto, E. Bryssinck, M. Fulle, G. Milani, C. Nassef, G. Savini).

Stacking of 24 unfiltered exposures, 57 seconds each, obtained remotely on 2020, June 10.4 from U69 (iTelescope, Auberry California) through a 0.61-m f/6.5 astrograph + CCD, shows that this object is a comet with a diffuse coma about 15" in diameter slightly elongated toward PA 358 (Observers A. Valvasori, E. Guido).


Our confirmation images (click here for a bigger version)






MPEC 2020-L46, assigns the following preliminary parabolic elements to comet C/2020 K8 (CATALINA-ATLAS): T 2020 Sept. 14.49; e= 1.0; Peri. =  260.11; q = 0.47;  Incl.= 31.42

by Ernesto Guido

Wednesday, June 3, 2020

New Comet C/2020 K7 (PANSTARRS)

CBET 4790 & MPEC 2020-L09, issued on 2020, June 02, announce the discovery of a comet (magnitude ~20) in four 45-s w-band CCD images obtained with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala. The new comet has been designated C/2020 K7 (PANSTARRS).

We performed follow-up measurements of this object while it was still on the PCCP webpage.

Stacking of 8 unfiltered exposures, 180 seconds each, obtained remotely on 2020, June 02.2 from X02 (Telescope Live, Chile) through a 0.6-m f/6.5 astrograph + CCD, shows that this object is a comet with a compact coma about 6" in diameter and a tail 3" long in PA 306 (Observers E. Guido, M. Rocchetto, E. Bryssinck, M. Fulle, G. Milani, C. Nassef, G. Savini).

Our confirmation image (click here for a bigger version)



MPEC 2020-L09, assigns the following preliminary parabolic orbital elements to comet C/2020 K7 (PANSTARRS): T 2021 Oct. 5.30; e= 1.0; Peri. =  60.84; q = 5.64;  Incl.= 34.55


by Ernesto Guido

Monday, May 25, 2020

New Comet C/2020 K3 (Leonard)

CBET 4782 & MPEC 2020-K159, issued on 2020, May 25, announce the discovery of a comet (magnitude ~18) by G. J. Leonard on images taken on May 22 UT with the Catalina Sky Survey's 0.68-m Schmidt reflector. The new comet has been designated C/2020 K3 (Leonard).

We performed follow-up measurements of this object while it was still on the PCCP webpage.

Stacking of 20 unfiltered exposures, 55 seconds each, obtained remotely on 2020, May 23.4 from H06 (iTelescope network)  through a 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer, shows that this object is a comet with a diffuse irregular coma about 15" in diameter.

Our confirmation image (click here for a bigger version)



MPEC 2020-K159, assigns the following preliminary parabolic orbital elements to comet C/2020 K3 (Leonard): T 2020 June 01.00; e= 1.0; Peri. =  64.49; q = 1.58;  Incl.= 129.01

By Ernesto Guido & Adriano Valvasori

Friday, May 15, 2020

New Comet P/2019 LM4 (Palomar)

CBET 4775 & MPEC 2020-J68, issued on 2020, May 14, announce that an apparently asteroidal object discovered on images taken at Palomar on 2019 June 4 and 7 with the 1.2-m f/2.4 Schmidt telescope (and given the minor-planet designation 2019 LM_4 when published on MPS 1001527, along with observations made elsewhere on June 8) has been re-discovered showing cometary appearance at two other observatories. The new comet has been designated P/2019 LM4 (Palomar).

According to the CBET 4775: B. Li reported the discovery by G. Zhaori of an extended object on images taken by L. F. Hu with the 1.04-m f/1.8 Schmidt telescope at the XuYi Station of Purple Mountain Observatory on May 11 UT in the course of the "Chinese Near Earth Object Survey" (discovery observations tabulated below).  Before the object was posted on the Minor Planet Center's NEOCP webpage, it wasdiscovered independently in images obtained with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala on May 12, with Y. Ramanjooloo (University of Hawaii) reporting that the full-width-at-half-maximum size was 3".6 compared to 1".2 for nearby stars.  Observations were subsequently identified at the Minor Planet of yet another apparent independent discovery of the comet from 2020 May 9.5 at mag 16.4-17.0 with a 0.5-m f/2 Schmidt reflector at Haleakala, Hawaii, in the course of the "Asteroid Terrestrial- Impact Last Alert System" (ATLAS) search program, though it appears that the ATLAS team did not report it as a comet.

We performed follow-up measurements of this object while it was still on the PCCP webpage.

Stacking of 14 unfiltered exposures, 120 seconds each, obtained remotely on 2020, May 13.2 from X02 (Telescope Live, Chile) through a 0.6-m f/6.5 astrograph + CCD, shows that this object is a comet with a compact round coma about 15" in diameter (Observers E. Guido, M. Rocchetto, E. Bryssinck, M. Fulle, G. Milani, C. Nassef, G. Savini).

Stacking of 16 unfiltered exposures, 60 seconds each, obtained remotely on 2020, May 13.4 from H06 (iTelescope, New Mexico) through a 0.50-m f/4.5 astrograph + CCD, shows that this object is a comet with a compact coma about 12" in diameter (Observers A. Valvasori & E. Guido).

Our confirmation images (click here for a bigger version)






MPEC 2020-J68, assigns the following elliptical elements to comet P/2019 LM4 (Palomar): T 2019 June 18.24; e= 0.58; Peri. =  68.37; q = 2.37;  Incl.= 36.39

by Ernesto Guido

Thursday, May 7, 2020

New Comet C/2020 J1 (SONEAR)

CBET 4769 & MPEC 2020-J37, issued on 2020, May 04, announce the discovery of a comet (magnitude ~17) on images taken with a 0.28-m f/2.2 astrograph of the "Southern Observatory for Near Earth Research" (SONEAR) at Oliveira, Brazil, on May 1 . The new comet has been designated C/2020 J1 (SONEAR).

We performed follow-up measurements of this object while it was still on the PCCP webpage.

Stacking of 8 unfiltered exposures, 90 seconds each, obtained remotely on 2020, May 04.3 from X02 (Telescope Live, Chile) through a 0.6-m f/6.5 astrograph + CCD, shows that this object is a comet with a compact coma about 5" in diameter.

Our confirmation image (click here for a bigger version)



MPEC 2020-J37, assigns the following preliminary parabolic orbital elements to comet C/2020 J1 (SONEAR): T 2021 Apr. 15.73; e= 1.0; Peri. =  344.44; q = 3.25;  Incl.= 142.16

By Ernesto Guido & Adriano Valvasori