[BAA Comets] Very rare outburst of Comet 174P/Echeclus / Asteroid (60558) Echeclus

Andrew Mickleburgh andrew.mickleburgh at ntlworld.com
Tue Sep 13 19:50:23 BST 2016


All,

Data from 20160912,

COD Z99
CON A.Mickleburgh, 38 Clixby Close, Cleethorpes. United Kingdom, DN35 0HS [andrew.mickleburgh at ntlworld.com]
OBS A. Mickleburgh
MEA A.Mickleburgh
TEL 0.356-m f/8 Schmidt-Cassegrain + CCD
ACK MPCReport file updated 2016.09.13 19:33:09
AC2 andrew.mickleburgh at ntlworld.com
NET UCAC-4
60558        KC2016 09 12.01281 01 24 15.02 +06 40 12.1          16.3 V      Z99
60558        KC2016 09 12.01680 01 24 14.95 +06 40 11.6          16.5 V      Z99
60558        KC2016 09 12.02054 01 24 14.91 +06 40 11.2          16.4 V      Z99
----- end -----


Regards,

Andy Mickleburgh




-----Original Message-----
From: Andrew Mickleburgh [mailto:andrew.mickleburgh at ntlworld.com] 
Sent: 31 August 2016 21:14
To: 'BAA Comets discussion list'
Subject: FW: [BAA Comets] Very rare outburst of Comet 174P/Echeclus / Asteroid (60558) Echeclus

All, 

Data from this morning (20160831), high haze present.

COD Z99
CON A.Mickleburgh, 38 Clixby Close, Cleethorpes. United Kingdom, DN35 0HS [andrew.mickleburgh at ntlworld.com]
OBS A. Mickleburgh
MEA A.Mickleburgh
TEL 0.356-m f/8 Schmidt-Cassegrain + CCD
ACK MPCReport file updated 2016.08.31 20:25:56
AC2 andrew.mickleburgh at ntlworld.com
NET UCAC-4
60558        KC2016 08 31.05778 01 26 46.21 +07 02 17.4          15.4 V      Z99
60558        KC2016 08 31.06340 01 26 46.16 +07 02 16.9          15.5 V      Z99
60558        KC2016 08 31.06901 01 26 46.10 +07 02 16.3          15.4 V      Z99

OBSERVER:    A. Mickleburgh
CONTACT:     A.Mickleburgh, 38 Clixby Close, Cleethorpes. United Kingdom, DN35 0HS [andrew.mickleburgh at ntlworld.com]
TELESCOPE:   0.356-m f/8 Schmidt-Cassegrain + CCD
EXPOSURE JD: Mid-exposure, not corrected for light time
-----------------------------------------------------
      JD         mag        SNR    ZeroPt   Design.
-----------------------------------------------------
2457631.55778   15.383 V  128.97   26.175   60558
2457631.56340   15.525 V  107.39   26.130   60558
2457631.56901   15.351 V  144.02   25.841   60558
----- end -----


Regards,
Andy Mickleburgh



-----Original Message-----
From: Andrew Mickleburgh [mailto:andrew.mickleburgh at ntlworld.com] 
Sent: 30 August 2016 15:24
To: 'BAA Comets discussion list'
Subject: RE: [BAA Comets] Very rare outburst of Comet 174P/Echeclus / Asteroid (60558) Echeclus

All,

Data from last night,

COD Z99
CON A.Mickleburgh, 38 Clixby Close, Cleethorpes. United Kingdom, DN35 0HS [andrew.mickleburgh at ntlworld.com]
OBS A. Mickleburgh
MEA A.Mickleburgh
TEL 0.356-m f/8 Schmidt-Cassegrain + CCD
ACK MPCReport file updated 2016.08.30 05:09:27
AC2 andrew.mickleburgh at ntlworld.com
NET UCAC-4
60558        KC2016 08 30.12680 01 26 55.04 +07 03 44.0          15.4 V      Z99
60558        KC2016 08 30.13409 01 26 54.96 +07 03 43.4          15.4 V      Z99
60558        KC2016 08 30.14138 01 26 54.89 +07 03 42.8          15.4 V      Z99
----- end -----

OBSERVER:    A. Mickleburgh
CONTACT:     A.Mickleburgh, 38 Clixby Close, Cleethorpes. United Kingdom, DN35 0HS [andrew.mickleburgh at ntlworld.com]
TELESCOPE:   0.356-m f/8 Schmidt-Cassegrain + CCD
EXPOSURE JD: Mid-exposure, not corrected for light time
-----------------------------------------------------
      JD         mag        SNR    ZeroPt   Design.
-----------------------------------------------------
2457630.62680   15.380 V  230.23   26.257   60558
2457630.63409   15.387 V  210.50   26.264   60558
2457630.64138   15.377 V  171.63   26.267   60558
----- end -----


Regards,
Andy Mickleburgh



-----Original Message-----
From: Comets-disc [mailto:comets-disc-bounces at britastro.org] On Behalf Of denis buczynski
Sent: 29 August 2016 02:34
To: BAA Comets discussion list
Subject: Re: [BAA Comets] Very rare outburst of Comet 174P/Echeclus / Asteroid (60558) Echeclus

Hello all,I was able to get some images just now in hazy skies. My measurements confirm the brightening. 
Here is my astrometry
COD I81
OBS D.Buczynski
MEA D.Buczynski
TEL 0.35-m Schmidt-Cassegrain + CCD + f/6 focal reducer
ACK MPCReport file updated 2016.08.29 01:11:12
AC2 buczynski8166 at btinternet.com
NET UCAC-4
0174P         C2016 08 29.03671 01 27 04.87 +07 05 21.8          15.3 N      I81
0174P         C2016 08 29.03816 01 27 04.85 +07 05 21.7          15.2 N      I81
0174P         C2016 08 29.03997 01 27 04.85 +07 05 21.4          15.3 N      I81
0174P         C2016 08 29.04215 01 27 04.81 +07 05 21.2          15.2 N      I81
0174P         C2016 08 29.04364 01 27 04.80 +07 05 21.1          15.2 N      I81
0174P         C2016 08 29.04651 01 27 04.77 +07 05 20.8          15.2 N      I81Denis Buczynski

      From: Richard Miles <rmiles.btee at btinternet.com>
 To: Observadores_cometas at yahoogroups.com; asvcometsection at yahoogroups.com; comets-ml at yahoogroups.com; BAA Comets discussion list <comets-disc at britastro.org>; les_cometes at yahoogroupes.fr 
Cc: Alan Fitzsimmons <afitzsimmonsqub at gmail.com>; Colin Snodgrass <c.d.b.snodgrass at gmail.com>; Meabh Hyland <mhyland02 at qub.ac.uk>
 Sent: Monday, 29 August 2016, 1:39
 Subject: [BAA Comets] Very rare outburst of Comet 174P/Echeclus / Asteroid (60558) Echeclus
   
Comet 174P has within the last 24 hours undergone a strong (2.6 mag) 
outburst as detected by Paul Camilleri observing from Blue Mountains 
Observatory, Leura, NSW, Australia (MPC Q68). Time of outburst appears to 
have been 2016 August 28.2 +/-0.4. Paul has asked me to alert observers.

Here are the results of my photometric measurements of some of Paul 
Camilleri's images:

COD Q68
COM Filter: Clear
COM Photometric aperture: 5.2" radius
OBS P. Camilleri
MEA R. Miles
TEL 0.30-m f/5.4 Schmidt-Cassegrain + CCD
ACK MPCReport file updated 2016.08.28 22:20:00
NET UCAC-4
0174P        C2016 08 27.71786 01 27 15.82 +07 07 18.5          17.76N 
Q68
0174P        C2016 08 27.74484 01 27 15.60 +07 07 16.1          17.92N 
Q68
0174P        C2016 08 28.68603 01 27 07.86 +07 05 55.1          15.21N 
Q68
0174P        C2016 08 28.70610 01 27 07.68 +07 05 53.3          15.23N 
Q68
----- end -----

Here is confirmation of the outburst using one of the 1.0-m LCOGT telescopes 
at Sutherland, South Africa:

COD K92
COM Filter: SDSS-r'
COM Photometric aperture: 5.6" radius
OBS R. Miles, LCOGT
MEA R. Miles
TEL 1.0-m f/8.0 Ritchey-Chretien + CCD
ACK MPCReport file updated 2016.08.28 23:56:45
AC2 rmiles at baa.u-net.com
NET UCAC-4
0174P        C2016 08 28.98523 01 27 05.32 +07 05 28.8          15.27N 
K92
0174P        C2016 08 28.98742 01 27 05.30 +07 05 28.8          15.27N 
K92
0174P        C2016 08 28.98960 01 27 05.28 +07 05 28.6          15.29N 
K92
----- end -----

Further confirmation from LCOGT, Tenerife. Single measurement - other images 
affected by mist.

COD Z21
COM Filter: SDSS-r'
COM Photometric aperture: 5.7" radius
OBS R. Miles, LCOGT
MEA R. Miles
TEL 0.40-m f/8 Schmidt-Cassegrain + CCD
ACK MPCReport file updated 2016.08.29 00:16:16
NET UCAC-4
0174P        C2016 08 28.98311 01 27 05.38 +07 05 27.6          15.25N 
Z21
----- end -----

Jean-François Soulier has also provided accurate astrometry/photometry as 
follows:

COD C10
COM Filter: Clear
COM Photometric aperture: 6.5" radius
CON JEAN-FRANCOIS SOULIER [jean-francois.soulier2 at wanadoo.fr]
OBS J.-F. Soulier
MEA J.-F. Soulier
TEL 0.30-m f/3.8 Newtonian reflector + CCD
ACK MPCReport file updated 2016.08.28
AC2 jean-francois.soulier2 at wanadoo.fr
NET UCAC-4
0174P        C2016 08 28.94562 01 27 05.67 +07 05 30.3          15.44N 
C10
0174P        C2016 08 28.96921 01 27 05.47 +07 05 28.3          15.37N 
C10
0174P        C2016 08 28.99322 01 27 05.26 +07 05 26.2          15.33N 
C10
----- end -----

This object appears to have undergone two outbursts since its discovery in 
2000 by Steward Observatory (Spacewatch) as a then asteroidal object. That 
of 2005 December / 2006 January was slighly brighter than this one and was 
associated with the appearance of a disintegrating chunk of material, which 
was well observed with large telescopes. The object was subsequently 
assigned a number as a periodic comet. A second outburst of 2011 May was 
considerably fainter than the present event. It is currently 16 months after 
perihelion (q = 5.82 AU,Q = 15.54 AU, Period = 34.9 yr).

Observers are strongly urged to monitor the development of this most rare 
outburst.

Richard Miles
British Astronomical Association


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