Possible comet candidate in SWAN.
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Michael Mattiazzo
Hello all,
There is a possible new comet candidate in SWAN data. Below are positions , approximate to a degree or so, converted to RA/Dec
Date R.A Dec 2020 04 07 22 51 -38 30 2020 04 06 22 46 -39 15 2020 04 05 22 42 -40 00 2020 04 04 22 39 -40 45 2020 04 03 22 34 -41 30 2020 04 02 22 29 -42 20 2020 04 01 22 23 -43 15
The candidate also appears to be brightening steadily. Attempts to confirm if the object is real are encouraged. It is situated in the southern norming sky, near the Grus, PsA border so restricted to observers in the southern hemisphere. Prediction for the next 24hrs will be near Pi PsA.
Cheers, Michael Mattiazzo
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Andrew Lowe
Very nice! Potential elements: T = 2020 Apr 16.24 q = 0.8207 e = 1 Peri. = 244.95 Node = 349.50 i = 17.60 With the low inclination, it could be short-period. Closest approach was 0.141 AU on March 12. Andrew andrew-lowe.ca From: "Michael Mattiazzo" <mmatti@...> To: comets-ml@groups.io Sent: Thursday, April 9, 2020 6:10:48 PM Subject: [comets-ml] Possible comet candidate in SWAN. Hello all,
There is a possible new comet candidate in SWAN data. Below are positions , approximate to a degree or so, converted to RA/Dec
Date R.A Dec 2020 04 07 22 51 -38 30 2020 04 06 22 46 -39 15 2020 04 05 22 42 -40 00 2020 04 04 22 39 -40 45 2020 04 03 22 34 -41 30 2020 04 02 22 29 -42 20 2020 04 01 22 23 -43 15
The candidate also appears to be brightening steadily. Attempts to confirm if the object is real are encouraged. It is situated in the southern norming sky, near the Grus, PsA border so restricted to observers in the southern hemisphere. Prediction for the next 24hrs will be near Pi PsA.
Cheers, Michael Mattiazzo
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Michael Mattiazzo
Thanks Andrew,
I’m sure the orbit is wrong as the comet is seen brightening from mag 11 to 10 over the week. But this orbit is fit for the purpose of searching over the next couple of days as it matches the positions well.
Cheers, Michael
From: comets-ml@groups.io <comets-ml@groups.io> On Behalf Of Andrew Lowe
Sent: Friday, 10 April 2020 2:09 PM To: comets-ml@groups.io; andrewlowe <andrewlowe@...> Subject: Re: [comets-ml] Possible comet candidate in SWAN.
Very nice!
Potential elements:
T = 2020 Apr 16.24 q = 0.8207 e = 1 Peri. = 244.95 Node = 349.50 i = 17.60
With the low inclination, it could be short-period.
Closest approach was 0.141 AU on March 12.
Andrew andrew-lowe.ca
From: "Michael Mattiazzo" <mmatti@...>
Hello all,
There is a possible new comet candidate in SWAN data. Below are positions , approximate to a degree or so, converted to RA/Dec
Date R.A Dec 2020 04 07 22 51 -38 30 2020 04 06 22 46 -39 15 2020 04 05 22 42 -40 00 2020 04 04 22 39 -40 45 2020 04 03 22 34 -41 30 2020 04 02 22 29 -42 20 2020 04 01 22 23 -43 15
The candidate also appears to be brightening steadily. Attempts to confirm if the object is real are encouraged. It is situated in the southern norming sky, near the Grus, PsA border so restricted to observers in the southern hemisphere. Prediction for the next 24hrs will be near Pi PsA.
Cheers, Michael Mattiazzo
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Matson, Rob D.
Ahha! Obscured by the confounded -30-degree beta line. (Sure would be nice if there was an option for images without the fiducial lines.) The comet certainly looks real to me. Nice find, Michael! --Rob
From: comets-ml@groups.io <comets-ml@groups.io> On Behalf Of
Andrew Lowe
Sent: Thursday, April 9, 2020 9:09 PM To: comets-ml@groups.io; andrewlowe <andrewlowe@...> Subject: EXTERNAL: Re: [comets-ml] Possible comet candidate in SWAN.
Very nice!
Potential elements:
T = 2020 Apr 16.24 q = 0.8207 e = 1 Peri. = 244.95 Node = 349.50 i = 17.60
With the low inclination, it could be short-period.
Closest approach was 0.141 AU on March 12.
Andrew andrew-lowe.ca
From:
"Michael Mattiazzo" <mmatti@...>
Hello all,
There is a possible new comet candidate in SWAN data. Below are positions , approximate to a degree or so, converted to RA/Dec
Date R.A Dec 2020 04 07 22 51 -38 30 2020 04 06 22 46 -39 15 2020 04 05 22 42 -40 00 2020 04 04 22 39 -40 45 2020 04 03 22 34 -41 30 2020 04 02 22 29 -42 20 2020 04 01 22 23 -43 15
The candidate also appears to be brightening steadily. Attempts to confirm if the object is real are encouaged. It is situated in the southern norming sky, near the Grus, PsA border so restricted to observers in the southern hemisphere. Prediction for the next 24hrs will be near Pi PsA.
Cheers, Michael Mattiazzo
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Martin Masek
Dear all, I have found this object and I have already reported it to the MPC. COD I47 CON [cassi@...] OBS M. Masek MEA M. Masek TEL 0.3-m f/6.8 reflector + CCD COM Possibly new comet from SWAN reported by Michael Mattiazzo at Comet-ml COM Remotely controlled telescope FRAM at Pierre Auger Observatory, COM 8.7 mag and coma diameter 5.4' at stacked 4×60s on V filtered exposures COM 10.3 mag and coma diameter 3.0' at stacked 4×60s on R filtered exposures COM tail 35" in p.a. 216 degrees on R filtered exposures NET UCAC-4 ACK MMASEK PCCP AC2 cassi@... SWAN01 C2020 04 10.39343 22 55 10.36 -38 08 13.1 8.7 V I47 SWAN01 C2020 04 10.39526 22 55 10.60 -38 08 09.5 10.3 R I47 SWAN01 C2020 04 10.39710 22 55 10.74 -38 08 06.4 8.7 V I47 SWAN01 C2020 04 10.39889 22 55 11.00 -38 08 03.1 10.3 R I47 SWAN01 C2020 04 10.40073 22 55 11.25 -38 07 59.3 8.7 V I47 ----- end ----- Martin Mašek pá 10. 4. 2020 v 2:11 odesílatel Michael Mattiazzo <mmatti@...> napsal:
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Martin Masek
There is an additional astrometry for this object from I47: SWAN01 C2020 04 10.40624 22 55 11.98 -38 07 49.0 10.3 R I47 SWAN01 C2020 04 10.40992 22 55 12.34 -38 07 42.8 8.7 V I47 SWAN01 C2020 04 10.41543 22 55 13.00 -38 07 32.5 10.3 R I47 Best regards, Martin Mašek pá 10. 4. 2020 v 12:40 odesílatel Martin Masek via groups.io <cassi.astronomy=gmail.com@groups.io> napsal:
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Maik Meyer
Hello all,
thanks for the additional observations, Martin! My very preliminary orbit is as follows - based on all observations by Martin and one selcted SWAN obs with a lower weighting. Screenshot attached. T = 2020 May 28 q = 0.43 AU e = 1.0 w = 69 n = 261 i = 110 H = 7 Comet should move nortward quickly an may even become a little brighter, perigee at 0.55 AU in mid-May. Elongation is decreasing until July. Of course... the orbit could be totally different, though. Regards Maik -- If they give you ruled paper, write the other way. * Juan Ramon Jimenez ________________________________________________________________________ http://www.comethunter.de * https://twitter.com/skymorph http://groups.io/g/comets-ml http://cobs.si |
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Bill J. Gray
Hi Maik,
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We seem to be in the same ballpark. A solution using all the SWAN astrometry, suitably downweighted (I'll update as more data comes in) : https://www.projectpluto.com/temp/swan01.htm (pseudo-MPEC) https://www.projectpluto.com/temp/swan01.txt (input astrometry) The orbit is probably "about right", within the somewhat large sigmas given (i=120 +/- 11, q=0.55 +/- 0.25). -- Bill On 4/10/20 7:16 AM, Maik Meyer wrote:
Hello all, |
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Stuart Rae
Hi all,
I attempted visual observation at Apr 10.71 with 20cmL. There was an object at around 22h57m -37°52' for which I estimated visually m1 = 7.9, DC = 4/, dia = 4', but the observation was affected by moonlight and I don't feel that confident. Will check it again tomorrow morning if the weather holds to confirm Stuart Rae New Zealand |
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Martin Masek
Dear all, I think I have found this object from our archive on older images (2020 04 09). This position is from image captured for atmospheric extinction measurement at Pierre Auger observatory, Argentina, with 300mm f/2.8 telephoto lens + CCD G4-16000 COD I47 CON [cassi@...] OBS M. Masek MEA M. Masek TEL 300mm f/2.8 telephoto lens + CCD NET UCAC-4 ACK MMASEK PCCP AC2 cassi@... SWAN01 C2020 04 09.33799 22 53 01.04 -38 40 51.8 10.7 B I47 ----- end ----- And this position is from our second site at Chile, near Paranal (Cherenkov telescope array). I have used 247 code for Roving observer. This image was captured also for atmospheric extinction measurement. COD 247 CON [cassi@...] OBS M. Masek MEA M. Masek TEL 135mm f/2 telephoto lens + CCD NET UCAC-4 ACK MMASEK PCCP AC2 cassi@... SWAN01 V2020 04 09.34749 22 53 02.32 -38 40 35.5 9.8 B 247 SWAN01 v2020 04 09.34749 1 289.6224 -24.6339 2350 247 ----- end ----- pá 10. 4. 2020 v 18:02 odesílatel Bill J. Gray <pluto@...> napsal: Hi Maik, |
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Paul Camilleri
COD 323 OBS P.Camilleri, J. Oey, R. Groom MEA P.Camilleri COM On single 60sec image, Coma 3’, Tail 1’ PA 218 degrees TEL 0.34-m F/5 reflector + CCD ACK MPCReport file updated 2020.04.11 07:06:45 NET UCAC-4 SWAN20B C2020 04 10.87250 22 56 09.79 -37 52 55.1 12.9 V 323 SWAN20B C2020 04 10.87383 22 56 09.98 -37 52 52.2 12.8 V 323 SWAN20B C2020 04 10.87531 22 56 10.10 -37 52 49.8 12.9 V 323 SWAN20B C2020 04 10.87636 22 56 10.31 -37 52 47.8 12.9 V 323 SWAN20B C2020 04 10.87902 22 56 10.63 -37 52 42.6 12.8 V 323 SWAN20B C2020 04 10.88534 22 56 11.36 -37 52 31.1 12.9 V 323 SWAN20B C2020 04 10.88725 22 56 11.60 -37 52 26.8 12.8 V 323 SWAN20B C2020 04 10.88901 22 56 11.84 -37 52 23.4 12.8 V 323 ----- end ----- Same object as above listed as SWAN01, Dan Green suggested using SWAN20B. Nice and bright total mag about 8 on images. Paul On Sat, 11 Apr 2020 at 04:37, Martin Masek <cassi.astronomy@...> wrote:
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planetaryscience@...
Thanks for the observation reports from everyone! Here's the current nominal orbit (assuming e=1) Perihelion 2020 May 28.184350 +/- 2.3 TT; Constraint: e=1 Epoch 2020 Apr 9.0 TT = JDT 2458948.5 Earth MOID: 0.1552 Ve: 0.0784 q 0.42047167 +/- 0.0269 (J2000 ecliptic) H 8.4 G 0.15 Peri. 69.97680 +/- 5.3 Node 261.90396 +/- 6 e 1.0 +/- 0 Incl. 109.43604 +/- 4.9 From 24 observations 2020 Apr. 3-10; mean residual 383".19 And discarding all but the 2 best SWAN observations: Perihelion 2020 May 29.094862 +/- 0.463 TT; Constraint: e=1 Epoch 2020 Apr 9.0 TT = JDT 2458948.5 Earth MOID: 0.1123 Ve: 0.0760 q 0.41043306 +/- 0.00436 (J2000 ecliptic) H 8.3 G 0.15 Peri. 72.02545 +/- 0.9 Node 264.49258 +/- 1.3 e 1.0 +/- 0 Incl. 107.46315 +/- 1.0 20 of 24 observations 2020 Apr. 6-10; mean residual 76".78 It should be reaching a peak pre-perihelion mag of c. 7-9 in early May
(at an elongation of ~50 degrees), and a peak post-perihelion mag of c.
4-7 in early June (at an elongation of ~20 degrees). Both far enough north that most northern hemisphere observers should be able to observe without much difficulty. ~Sam
On Friday, April 10, 2020, 3:02:35 PM MST, Paul Camilleri <pcamilleri71@...> wrote:
COD 323 OBS P.Camilleri, J. Oey, R. Groom MEA P.Camilleri COM On single 60sec image, Coma 3’, Tail 1’ PA 218 degrees TEL 0.34-m F/5 reflector + CCD ACK MPCReport file updated 2020.04.11 07:06:45 NET UCAC-4 SWAN20B C2020 04 10.87250 22 56 09.79 -37 52 55.1 12.9 V 323 SWAN20B C2020 04 10.87383 22 56 09.98 -37 52 52.2 12.8 V 323 SWAN20B C2020 04 10.87531 22 56 10.10 -37 52 49.8 12.9 V 323 SWAN20B C2020 04 10.87636 22 56 10.31 -37 52 47.8 12.9 V 323 SWAN20B C2020 04 10.87902 22 56 10.63 -37 52 42.6 12.8 V 323 SWAN20B C2020 04 10.88534 22 56 11.36 -37 52 31.1 12.9 V 323 SWAN20B C2020 04 10.88725 22 56 11.60 -37 52 26.8 12.8 V 323 SWAN20B C2020 04 10.88901 22 56 11.84 -37 52 23.4 12.8 V 323 ----- end ----- Same object as above listed as SWAN01, Dan Green suggested using SWAN20B. Nice and bright total mag about 8 on images. Paul On Sat, 11 Apr 2020 at 04:37, Martin Masek <cassi.astronomy@...> wrote:
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