Topics

Possible comet candidate in SWAN.


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

 


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

 



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@...>
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

 

 


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@...>
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 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

 

 


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:

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

 


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:

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:

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

 


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


Bill J. Gray
 

Hi Maik,

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,
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


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


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,

    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,
>
> 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
>




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:
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,

    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,
>
> 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
>




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:
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,

    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,
>
> 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
>