Monday, January 6, 2020

New Comet C/2019 Y1 (ATLAS)

CBET 4708 & MPEC 2020-A72, issued on 2020, January 05,  announce the discovery of a comet (magnitude ~18) in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program, in images taken on 2019, Dec 16 with a 0.5-m reflector + CCD. The new comet has been designated C/2019 Y1 (ATLAS).  

I performed follow-up measurements of this object while it was still on the PCCP webpage. Stacking of 28 unfiltered exposures, 30 seconds each, obtained remotely on 2019, December 20.15 from X02 Telescope Live network (El Sauce, Chile) through a 0.6-m f/6.5 reflector + CCD, shows that this object is a comet with a sharp central condensation and a diffuse irregular coma about 15 arcsec in diameter elongated in PA 90.

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

M.P.E.C. 2020-A72, assigns the following preliminary orbital elements to comet  C/2019 Y1: T 2020 Mar. 15.54; e= 1.0; Peri. =  57.20; q = 0.84;  Incl.= 73.40

Neither the MPEC nor the CBET mention the relationship that has been pointed out by R. J. Bouma in comets-ml mailing list about this comet and the "LILLER" group (comets C/1988 A1 Liller, C/1996 Q1 Tabur, C/2015 F3 SWAN).

by Ernesto Guido

Tuesday, December 31, 2019

Comets & Asteroids - Summary for Nov & Dec 2019

During the 2-month period November through December 2019, 4 new comets were discovered and there was 1 comet recovery. "Current comet magnitudes" & "Daily updated asteroid flybys" pages are available at the top of this blog (or just click on the underline text here). See below for the "Other news" section.

The dates below refer to the date of issuance of CBET (Central Bureau Electronic Telegram) which reported the official news & designations.

- Comet Discoveries

- Cometary activity detected

- Comet Recoveries

- Other news


Saturday, November 30, 2019

Comets & Asteroids - Summary for Sept & Oct 2019

During the 2-month period September through October 2019, 9 new comets were discovered, cometary activity was detected for 1 previously discovered object (earlier designated as asteroids) and there were 6 comet recoveries. "Current comet magnitudes" & "Daily updated asteroid flybys" pages are available at the top of this blog (or just click on the underline text here). See below for the "Other news" section.

The dates below refer to the date of issuance of CBET (Central Bureau Electronic Telegram) which reported the official news & designations.

- Comet Discoveries

Sep 10 Discovery of C/2019 Q3 (PANSTARRS)            (CBET 4665)
Sep 12 Discovery of C/2019 Q4 (BORISOV)                 (CBET 4666)
Oct 05 Discovery of P/2019 S2 (PANSTARRS)             (CBET 4673)
Oct 05 Discovery of P/2019 S3 (PANSTARRS)             (CBET 4674)
Oct 16 Discovery of C/2019 T3 (ATLAS)                       (CBET 4678)
Oct 23 Discovery of C/2019 T4 (ATLAS)                       (CBET 4681)
Oct 23 Discovery of C/2019 T5 (ATLAS)                       (CBET 4682)
Oct 24 Discovery of P/2019 T6 (PANSTARRS)             (CBET 4684)
Oct 28 Discovery of P/2019 U4 (PANSTARRS)             (CBET 4688)

- Cometary activity detected

Oct 06 Cometary activity detected in 2018 DO4 =  C/2018 DO_4 (LEMMON)  (CBET 4675)

- Comet Recoveries

Sep 08 Recovery of P/2007 T4 (GIBBS) as P/2019 R2                   (CBET 4662)
Sep 09 Recovery of P/2008 Y1 (BOATTINI) as P/2019 R1            (CBET 4663)
Sep 27 Recovery of P/2006 R1 (SIDING SPRING) as P/2019 S1  (CBET 4671)
Oct 25 Recovery of P/2006 W1 (GIBBS) as P/2019 U1                 (CBET 4685)
Oct 28 Recovery of P/2006 F1 (KOWALSKI) as P/2019 U2          (CBET 4686)
Oct 28 Recovery of P/2004 WR_9 (LINEAR) as P/2019 U3          (CBET 4687)

- Other news

Sep 04 New paper on Arxiv by D. Jewitt & J. Luu: "Disintegrating In-Bound Long-Period Comet C/2019 J2".

Credit: Jewitt & Luu

Sep 16 Analysis of a bright flash in Jupiter’s atmosphere observed by an amateur astronomer in August 2019 has revealed that the likely cause was a small asteroid with a density typical of stony-iron meteors. The impact is estimated to have released energy equivalent to an explosion of 240 kilotons of TNT – around half the energy released in the 2013 Chelyabinsk event at Earth.

Credit: E. Chappel/R. Hueso

Oct 07 Saturn Surpasses Jupiter After The Discovery Of 20 New Moons. A team led by Carnegie's Scott S. Sheppard has found 20 new moons orbiting Saturn.  This brings the ringed planet’s total number of moons to 82, surpassing Jupiter, which has 79. 

Credit: NASA/JPL-Caltech/Space Science Institute/Sartorio/Shutterstock

Oct 08 The 2019 #NobelPrize in Physics has been awarded with one half to James Peebles “for theoretical discoveries in physical cosmology” and the other half jointly to Michel Mayor and Didier Queloz “for the discovery of an exoplanet orbiting a solar-type star”.

Credit: Mayor & Queloz

Oct 28 Beautiful images from VLT/SPHERE of the fourth biggest asteroid, Hygiea, found a big surprise: an almost spherical shape. It was hit in the past by a big impact which shattered and reassembled it while still fluid.

Credit: Vernazza et al.

by Ernesto Guido

Thursday, October 31, 2019


Following the posting on the Central Bureau's Transient Object Confirmation Page about a possible Nova in Scutum (TOCP Designation: PNV J18395972-1025415) I performed some follow-up of this object through a TEL 0.6-m f/6.5 astrograph + CCD located in the El Sauce Observatory in Chile and operated by Telescope Live network.  

On images taken on October 31.01, 2019 I can confirm the presence of an optical counterpart with R-filtered CCD magnitude about +8.4 (saturated in a 10-second exposure) at coordinates:

R.A. = 18 39 59.71, Decl.= -10 25 41.9

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

This transient was discovered (discovered magnitude 11.5 g-Sloan Filter) by the All-Sky Automated Survey for Supernovae (ASAS-SN) on 2019 Oct. 29 at 01:12UT and reported to Transient Name Server (TNS) on Oct. 29 at 02:07:49 UTC as ASASSN-19aad = AT 2019tpb. According to CBET 4690, several independents discoveries have been reported to the Central Bureau of a nova in Scutum: Koichi Nishiyama (unfiltered magnitude 9.4 on Oct. 29.397), Hideo Nishimura (unfiltered magnitude 9.8 on Oct. 29.421), Shizuo Kaneko (unfiltered magnitude 9.8 on Oct. 29.462) (on AAVSO VSX is reported also Fujio Kabashima as independent discoverer). 

Spectroscopy by S. C. Williams et al. (see ATel #13241) & by  M. Pavana et al. (see ATel #13245) show that AT 2019tpb/ASASSN-19aad is a Galactic nova in the early stages of eruption.

N. Samus writes that the permanent GCVS designation V659 Sct has been assigned to this nova.

Below my confirmation image (sum of two unfiltered 30-sec exposure through a 0.6-m f/6.5 astrograph + CCD; El Sauce Observatory, Chile). Click on the image for a bigger version: 

An animation showing a comparison between my image and the archive POSS1 Blue plate (1951-07-30).

Below the same animation with a larger field of view. At the bottom left of V659 Sct you will notice a star occupying a different position in the new image with respect to the 1951 archive image. This star (Gaia designation DR2 4155146598548456064) is a high proper  motion star. Most stars are so distant that their apparent motion even over hundreds of years is all but negligible to naked eye observers. Some stars have very significant movements compared to the background stars (Click on it for a bigger version:

Below an image that is the difference between the new image and the archive image useful to highlight the "new" objects. There you can easily see the new galactic nova V659 Sct and the  high proper motion star.

by Ernesto Guido

Monday, September 30, 2019

Comet Images from the Dark Sky Of Chile

Below you can find a selection of some of the comets we imaged in the last few days using remotely a Planewave Telescope CDK24 a 0.61-m f/6.5 reflector + CCD located in the El Sauce Observatory in Chile. The telescope is owned by "TELESCOPE LIVE" network and we would like to thank them for allowing us to use their telescope for these images free of charge. Click on each image for a bigger version.

68P/Klemola  - 2019, September 27

29P/Schwassmann–Wachmann -  2019, September 27

101P/Chernykh - 2019, September 30

C/2017 U7 - 2019, September 30

C/2016 M1 (PANSTARRS) - 2019, October 06

by Ernesto Guido

Saturday, August 31, 2019

Comets & Asteroids - Summary for July & August 2019

During the 2-month period July through August 2019, 7 new comets were discovered and there were 4 comet recoveries. "Current comet magnitudes" & "Daily updated asteroid flybys" pages are available at the top of this blog (or just click on the underline text here). See below for the "Other news" section.

The dates below refer to the date of issuance of CBET (Central Bureau Electronic Telegram)  which reported the official news & designations.

- Comet Discoveries

Jul 01 Discovery of C/2019 L3 (ATLAS)                  (CBET 4644)
Jul 02 Discovery of C/2019 K7 (SMITH)                  (CBET 4645)
Jul 02 Discovery of C/2019 K8 (ATLAS)                  (CBET 4646)
Jul 03 Discovery of C/2019 LB_7 (KLEYNA)           (CBET 4647)*
Jul 15 Discovery of C/2019 N1 (ATLAS)                  (CBET 4650)
Jul 17 Discovery of P/2019 M2 (ATLAS)                  (CBET 4651)**
Jul 18 Discovery of C/2019 M3 (ATLAS)                  (CBET 4653)

*The available astrometry for this very faint object was published on MPEC 2019-N20, where it was inadvertently given the minor-planet designation 2019 LB_7 by the Minor Planet Center.

**Following a private remark by the D. Green that the orbital elements of comets D/1884 O1 (Barnard) and P/2019 M2 are similar, Nakano has attempted an investigation into the possibility that the two designations might refer to the same comet. Nakano remarks that he is unable to link the two orbits, suggesting that (while possibly related) the two comets seem to be different objects. Additional astrometry for P/2019 M2 is urgently needed to extend the arc of observations at this return, before the comet fades rapidly in the coming weeks.(CBET 4657)

- Comet Recoveries

Jul 06 Recovery of P/2006 S1 (CHRISTENSEN) as P/2019 M1     (CBET 4649)
Jul 17 Recovery of 39P/OTERMA                                                   (CBET 4652)*
Jul 28 Recovery of P/2014 U2 (KOWALSKI) as P/2019 O1          (CBET 4654)
Aug 09 Recovery of P/2010 U2 (HILL) as P/2019 P1                    (CBET 4658)

*Recovery of comet 39P/Oterma (magnitude 24) on CCD images taken on July 3 UT with the 8.1-m "Gemini South" telescope, with confirmatory follow-up images being obtained on July 5 using both the 8.1-m "Gemini South" and the 6.5-m Magellan-Clay telescopes.  A point-source object was located within 1" of an ephemeris generated by the orbit given on MPC 75716.An upper bound of the nucleus radius -- based on photometry of the July 3 and 5 individual 100-s r' images and assuming a 4-percent albedo -- is between 2.1 and 2.5 km.  This upper bound is lower than what would be derived from 2001 photometry reported on MPCs 43260 and 43446 (2.5-3.5 km), suggesting that there might have been a compact coma in those observations and/or that 39P has an elongated nucleus.The comet was last seen in 2001 (cf. IAUC 7689). Comet 39P is currently inbound with perihelion in 2023. The comet was missed at its 1983 return.

- Other news

Jul 08 Zwicky Transient Facility (ZTF) spotted an unusual asteroid with the shortest "year" known for any asteroid. The rocky body, dubbed 2019 LF6, is about a kilometer in size and circles the sun roughly every 151 days. In its orbit, the asteroid swings out beyond Venus and, at times, comes closer in than Mercury, which circles the sun every 88 days. 2019 LF6 is one of only 20 known "Atira" asteroids, whose orbits fall entirely within Earth's. In the images below you can see an animation showing the asteroid as captured by ZTF on June 10 and how the orbit of 2019 LF6 (white) falls entirely within the orbit of Earth (blue).

Credit: ZTF/Caltech Optical Observatories

Credit: NASA/JPL-Caltech

Jul 12 ATel #12931 Disintegration of Comet C/2019 J2 (Palomar) - Quanzhi Ye et al. report the apparent disintegration of comet C/2019 J2 (Palomar), first detected by Soulier and Sárneczky on images taken on UT 2019 July 6-7. After receiving the reports from Soulier and Sárneczky, Ye examined the images taken with the Zwicky Transient Facility (ZTF) operated on the 1.2-m Oschin Schmidt telescope at Palomar Observatory. The ZTF image on July 9 shows that the comet has lost its central condensation. Although the disintegration only becomes apparent at some time between the ZTF observation on July 2 and the Maisoncelles/Konkoly observation on July 6, ZTF photometry suggests that the process likely started much earlier, possibly in early May. The brightness of the comet increased by ~0.6 mag from Apr. 27 to May 9, then decreased by an equal amount from May 9 to Jul. 2, while a typical comet would have brightened by 1.0 mag from Apr. 27 to Jul. 2.

Jul 29 Austrian filmmaker Christian Stangl combined some of the more than 400,000 images taken by @ESA's Rosetta mission into a stunning short film: "the Comet". Together the images show details of Comet 67P, which Rosetta followed and researched for 2 years.

Aug 07 On July 24, asteroid 2019 OK (60-130 meters in size; discovered by SONEAR team @CrisJacques)  approached Earth at about 65,000 km above the surface, one fifth the distance to the Moon. Largest Asteroid To Pass This Close To Earth in a Century

Credits: P. Chodas (NASA/JPL)

Aug 08 A possible impact on Jupiter recorded on 07 August 2019 at 04:07 UTC by E. Chappel. This is not the first time that we have seen something slam into Jupiter. It's actually the seventh event of its kind in recent years. More info about past recent events are available here

Credits: E. Chappel

Credits: E. Chappel

Aug 17 Fireball over Sardinia, Italy on the evening of August 16, 2019 via @ClaudioPorcu - More video available here  #meteor #meteora #astronomy #astronomia #Sardegna

Credits: C. Porcu

Below you can see a map showing the trajectory in the atmosphere projected to the ground of this bolide. The triangulation was done using 6 visual observations selected among the more than 80 arrived at the IMO.

(Credits: A. Carbognani)

by Ernesto Guido

Wednesday, July 31, 2019

Comets & Asteroids - Summary for May & June 2019

During the 2-month period May through June 2019, 11 new comets were discovered and there were 2 comet recoveries. "Current comet magnitudes" & "Daily updated asteroid flybys" pages are available at the top of this blog (or just click on the underline text here). See below for the "Other news" section.

The dates below refer to the date of issuance of CBET (Central Bureau Electronic Telegram)  which reported the official news & designations.

- Comet Discoveries

May 04 Discovery of C/2019 H1 (NEOWISE)                  (CBET 4623)
May 12 Discovery of C/2019 J1 (LEMMON)                   (CBET 4625)
May 13 Discovery of C/2019 J2 (PALOMAR)                  (CBET 4626)
May 23 Discovery of C/2019 K1 (ATLAS)                    (CBET 4629)
May 23 Discovery of C/2019 J3 (ATLAS)                    (CBET 4630)
May 24 Discovery of C/2019 JU_6 (ATLAS)                  (CBET 4631)*
Jun 24 Discovery of C/2019 K4 (YE)                       (CBET 4636)
Jun 28 Discovery of C/2019 K5 (YOUNG)                    (CBET 4637)
Jun 28 Discovery of C/2019 L1 (PANSTARRS)                (CBET 4640)
Jun 28 Discovery of C/2019 L2 (NEOWISE)                  (CBET 4641)
Jun 30 Discovery of C/2019 K1 (ATLAS)                    (CBET 4643)

* Apparently asteroidal object that was discovered on CCD images obtained on 2019 May 12.5 with a 0.5-m reflector at Haleakala in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program), and given the minor-planet designation 2019 JU_6 by the Minor Planet Center (cf. MPS 996641; orbit on MPEC 2019-J141 from a two-day arc), has been found to show cometary appearance by CCD astrometrists elsewhere.

- Comet Recoveries

Jun 03 Recovery of P/2000 S4 (LINEAR-SPACEWATCH) as P/2019 K2     (CBET 4633)
Jun 04 Recovery of P/2007 R1 (LARSON)            as P/2019 K3     (CBET 4635)

- Other news

May 01 Miklós Lovas, most successful Hungarian discoverer, has passed away at the age of 88 years on April 18th. He discovered 42 supernovae, 5 comets (including 93P & 184P) and 2 unusual minor planets at the Konkoly Obs. between 1964 and 1995 via K. Sárneczky

May 10 (CBET 4624) OUTBURST OF 15-BOOTIDS METEOR SHOWER - P. Jenniskens, SETI Institute and NASA Ames Research Center, and E. Lyytinen, Finland, report activity of the 15-Bootid meteors (IAU shower 923, code FBO) between 2019 Apr. 21d22h01m and 22d00h13m UTC, corresponding to solar longitude 31.24-31.34 degrees (equinox J2000.0). Six 15-Bootids were detected between 22h01m and 00h12m UTC by the low-light video cameras of the CAMS BeNeLux network (coordinated by C. Johannink) during routine observations that were made during 19h50m-03h15m UTC that night. The orbital elements bear some resemblance to those of the bright comet C/539 W1 (parabolic orbital elements q = 0.16 +/- 0.15 AU, i = 19 +/- 6 deg, Argument of Perihelion = 246 +/- 40 deg, Node = 33 +/- 20 deg; cf. Hasegawa 1979, PASJ 31, 257).  The broad 2-hr duration of the shower, presumably requiring somewhat higher ejection velocities, is consistent with a relatively large comet.

May 17 (CBET 4627) NEW SATELLITE AROUND (31) EUPHROSYNE - P. Vernazza, B. Carry, F. Vachier, J. Hanus, J. Berthier, B. Yang, F. Marchis and the HARISSA team report the discovery of a satellite around minor planet (31) Euphrosyne.  They observed (31) Euphrosyne with the Very Large Telescope (+ SPHERE/ZIMPOL) at six different epochs between 2019 Mar. 15 and Apr. 10.  On Mar. 15.301 UT, the satellite was at a separation of 0".398 arcsec (projected separation 651 km) in p.a. 268.49 degrees; on Apr. 10.109, the satellite was found at a separation of 0".384 in p.a. 87.0 degrees. Based on these detections, the mean magnitude difference through an N_R filter (central wavelength 645.9 nm; bandwidth 56.7 nm) between (31) and its companion is 8.0 +/- 0.8, implying a diameter of about 6 km.  Preliminary orbit computation indicates an orbital period of about 1.2 days for the satellite, with a semi-major axis of 677 km.

May 17 CBET 4628, CBET 4632 (May 29), CBET 4634 (Jun 03) report that the following minor planets are binaries systems: (2873) BINZEL, (72036) 2000 XM44 & (1344) CAUBETA

May 23 "From Centaurs to comets - 40 years" - Review chapter to be published in the book "The Transneptunian Solar System" #astronomy #comets #centaurs

Credit: Peixinho et al.

Jun 04 The #VLT instrument #SPHERE observed the double asteroid (66391) 1999 KW4 as it flew by Earth on 25 May #astronomy #asteroids

Credit: ESO

Jun 06 HiPOD: A new impact crater on Mars, formed between Sept 2016 and Feb 2019. What makes this stand out is the darker material exposed beneath the reddish dust.

: NASA/JPL/University of Arizona

Jun 19 ‘Comet Interceptorhas been selected as ESA’s new fast-class mission in its Cosmic Vision Programme. Comprising three spacecraft, it will be the first to visit a truly pristine comet or other interstellar object that is only just starting its journey into the inner Solar System.

Jun 28 (CBET 4638) 2019 MO - An 18th-magnitude fast-moving asteroidal object, detected on June 22.3 and 22.4 UT with the Pan-STARRS2 1.8-m Ritchey-Chretien reflector at Haleakala and the ATLAS 0.5-m reflector at Mauna Loa and designated 2019 MO by the Minor Planet Center on MPEC 2019-M72 (which contains astrometry and orbital elements), impacted the earth's atmosphere around June 22.896 UT.  It was evidently detected in daylight satellite imagery over the Caribbean Sea. The absolute magnitude of 29.3 suggests a size prior to entry on the order of 3-4 meters. This is fourth known object to hit the earth's atmosphere after detection in space prior to impact (cf. CBET 4519).

Jun 29 (CBET 4642) JUNE EPSILON OPHIUCHID METEORS - P. Jenniskens, SETI Institute and NASA Ames Research Center, reports unusual activity of the June epsilon Ophiuchids shower (IAU shower 459, code JEO) between 2019 June 19d08h and 26d05h UTC, corresponding to the solar longitude range 87.5-94.1 degrees, with most activity between solar longitude 89.3 and 93.3 degrees, centered on 92.11 degrees (equinox J2000.0).  Eighty-eight June epsilon Ophiuchids were detected by CAMS camera network on June 19-26. The orbital elements resemble those of the Jupiter-family comet 300P/Catalina (q = 0.826 AU, a = 2.695 AU, i = 5.69 degrees, Peri. = 222.75 degrees, Node = 95.81 degrees, and longitude of perihelion 318.56 degrees. The outburst confirms the existence of this otherwise minor shower (cf. Rudawska and Jenniskens 2014, Meteoroids 2013, p. 217) and offers evidence of past activity of its parent body.

Bright June epsilon Ophiuchid shower meteor captured on 2019, June 24

Credit: Rancho Mirage Observatory (Eric McLaughlin)

by Ernesto Guido