From planetaryscience at yahoo.com  Fri Mar  6 00:06:59 2020
From: planetaryscience at yahoo.com (Sam Deen)
Date: Fri, 6 Mar 2020 05:06:59 +0000 (UTC)
Subject: [neo_followup] C2AKH72 probable Atira (q ~= 0.30 AU, Q ~= 0.91 AU)
References: <119271632.5279460.1583471219690.ref@mail.yahoo.com>
Message-ID: <119271632.5279460.1583471219690@mail.yahoo.com>

Hi all,
Might want to attempt to get some observations of C2AKH72, currently magnitude ~20.8 and at an elongation of ~58 degrees. Find_orb gives its aphelion as 0.910 +/- 0.026 AU, and CNEOS gives it a 56% chance of being an Atira asteroid. Hitting nearly magnitude 21 at an elongation of <60 degrees probably won't be too high of a priority for most surveys due to its sheer difficulty, so I'd recommend followup by anyone able over the next day or two, just to be sure it'll get properly followed up on.

~Sam
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From planetaryscience at yahoo.com  Sat Mar  7 00:15:28 2020
From: planetaryscience at yahoo.com (Sam Deen)
Date: Sat, 7 Mar 2020 05:15:28 +0000 (UTC)
Subject: [neo_followup] {MPML} C2AKH72 probable Atira (q ~= 0.30 AU,
 Q ~= 0.91 AU)
In-Reply-To: <15F99EAF8EC08253.8349@groups.io>
References: <119271632.5279460.1583471219690.ref@mail.yahoo.com>
 <15F99EAF8EC08253.8349@groups.io>
Message-ID: <142996688.5832452.1583558128448@mail.yahoo.com>

 C2AKH72 has been confirmed to not be an Atira asteroid.
~sam

    On Thursday, March 5, 2020, 10:07:05 PM MST, Sam Deen via Groups.Io <planetaryscience=yahoo.com at groups.io> wrote:  
 
 Hi all,
Might want to attempt to get some observations of C2AKH72, currently magnitude ~20.8 and at an elongation of ~58 degrees. Find_orb gives its aphelion as 0.910 +/- 0.026 AU, and CNEOS gives it a 56% chance of being an Atira asteroid. Hitting nearly magnitude 21 at an elongation of <60 degrees probably won't be too high of a priority for most surveys due to its sheer difficulty, so I'd recommend followup by anyone able over the next day or two, just to be sure it'll get properly followed up on.

~Sam
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From seaman at hanksville.org  Sat Mar  7 11:47:30 2020
From: seaman at hanksville.org (Robert Seaman)
Date: Sat, 7 Mar 2020 09:47:30 -0700
Subject: [neo_followup] {MPML} C2AKH72 probable Atira (q ~= 0.30 AU,
 Q ~= 0.91 AU)
In-Reply-To: <142996688.5832452.1583558128448@mail.yahoo.com>
References: <119271632.5279460.1583471219690.ref@mail.yahoo.com>
 <15F99EAF8EC08253.8349@groups.io>
 <142996688.5832452.1583558128448@mail.yahoo.com>
Message-ID: <81C56DFA-0618-4641-8F60-1660C36FAF72@hanksville.org>

But it?s 95% likely to be a PHA:

https://cneos.jpl.nasa.gov/scout/#/object/C2AKH72 <https://cneos.jpl.nasa.gov/scout/#/object/C2AKH72>

?so follow-up would continue to be appreciated!

Rob Seaman
Catalina Sky Survey
?


> On Mar 6, 2020, at 10:15 PM, Sam Deen <planetaryscience at yahoo.com <mailto:planetaryscience at yahoo.com>> wrote:
> 
> C2AKH72 has been confirmed to not be an Atira asteroid.
> 
> ~sam
> 
> On Thursday, March 5, 2020, 10:07:05 PM MST, Sam Deen via Groups.Io <planetaryscience=yahoo.com at groups.io <mailto:planetaryscience=yahoo.com at groups.io>> wrote:
> 
> 
> Hi all,
> 
> Might want to attempt to get some observations of C2AKH72, currently magnitude ~20.8 and at an elongation of ~58 degrees. Find_orb gives its aphelion as 0.910 +/- 0.026 AU, and CNEOS gives it a 56% chance of being an Atira asteroid. Hitting nearly magnitude 21 at an elongation of <60 degrees probably won't be too high of a priority for most surveys due to its sheer difficulty, so I'd recommend followup by anyone able over the next day or two, just to be sure it'll get properly followed up on.
> 
> ~Sam
> _._,_._,_
> Groups.io <http://groups.io/> Links:
> You receive all messages sent to this group.
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> View/Reply Online (#35398) <https://groups.io/g/mpml/message/35398> | Reply To Sender <mailto:planetaryscience at yahoo.com?subject=Private:%20Re:%20%7BMPML%7D%20C2AKH72%20probable%20Atira%20%28q%20~%3D%200.30%20AU%2C%20Q%20~%3D%200.91%20AU%29> | Reply To Group <mailto:mpml at groups.io?subject=Re:%20%7BMPML%7D%20C2AKH72%20probable%20Atira%20%28q%20~%3D%200.30%20AU%2C%20Q%20~%3D%200.91%20AU%29> | Mute This Topic <https://groups.io/mt/71766642/2027585> | New Topic <https://groups.io/g/mpml/post>
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From pluto at projectpluto.com  Mon Mar 16 09:55:52 2020
From: pluto at projectpluto.com (Bill Gray)
Date: Mon, 16 Mar 2020 09:55:52 -0400
Subject: [neo_followup] Two CSS objects in particular need of follow-up
Message-ID: <8fc7b174-bcdd-c646-cfef-7ba601067761@projectpluto.com>

Hello all,

    Catalina looks to have started out the lunation with a
bang.  Lots of 'C' designations on NEOCP right now,  and
several objects of particular interest.

    C2D5CK2 could really use some followup.  It's currently
at mag 18.9 and getting brighter as it approaches us (it's
about a million km away at present).  Unfortunately,  the
one-sigma ephemeris uncertainty is about ten arcminutes and
growing quickly.  Getting it in the next few hours would be
a Really Good Thing.  After that,  it'll take something with
a larger than usual field of view.  Perigee is in about ten
hours,  at roughly half the distance to the moon.

    C2D4Y62 isn't quite as urgent,  but could definitely use
some attention in the next 15 hours or so.  It's at mag 19.3,
and coming in to perigee at about 4:00 UT on the 18th.  Another
tracklet or two would enable us to follow it all the way in.

-- Bill



From planetaryscience at yahoo.com  Wed Mar 18 01:40:06 2020
From: planetaryscience at yahoo.com (Sam Deen)
Date: Wed, 18 Mar 2020 05:40:06 +0000 (UTC)
Subject: [neo_followup] X67648: an NEO on a very unusual orbit,
 potentially a progenitor to the Daytime Kappa Aquariids
References: <1656417267.65692.1584510006779.ref@mail.yahoo.com>
Message-ID: <1656417267.65692.1584510006779@mail.yahoo.com>

Hi all,
We've got a (not quite as exceptional perihelion-wise) 2020 BU13-like object, but a very odd object nonetheless. Based on 10 hours of observation so far, X67648 seems to be on an extremely eccentric orbit that takes it from <0.3 AU from the Sun to well over 4 AU. The min aphelion according to CNEOS is ~4.4 AU, and the max is ~8.7 AU (the nominal being ~5.6 AU). Although a large number of low-perihelion asteroids have aphelia extending nearly out to Jupiter, only a tiny handful actually cross Jupiter's orbit: 2013 JA36, 2016 BY14, 2006 OS9, 2010 JG87, 2017 HE4, 2011 GS60, and 2019 OC5. Of those, only the final three have aphelia beyond this object's nominal orbit.
Performing a search for similarities to known meteor showers, the definite closest relationship is the shower 00128/MKA - the Daytime Kappa Aquariids, compared here to X67648's preliminary orbit, as well as the hypothesized parent body of them, 2002 EV11:

???????????? MKA? X67648? 2002 EV11
q??????? ~0.23??? ~0.25???? 0.232
e???????? ~0.88?? ~0.91???? 0.889
i????????? ~2.2 ??? ~0.3?????? 11.60
node? ~358??? ~200????? 183.6
peri??? ~50????? ~210????? 218.1
long??? ~48???? ~50??????? 41.7H?????? N/A?? ? ?? 25.8??? ? 20.0d (m) N/A????? ~24??????? ~340

The possible relationship is fairly clear.

Followup would of course be very much appreciated. The object is currently circa magnitude 20.5 and dimming moderately quickly, at a very favorable elongation. The uncertainty will remain at a couple dozen arcseconds for the next few days, so really the main limiting factor for study is its dimming. Even if it is a meteor shower progenitor, I very much doubt that at this distance it would be outputting very much dust, but it couldn't hurt to pay special attention to any cometary activity for anyone observing it.

~Sam
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