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Bruce BettsMarch 31, 2015

Revitalized 0.81m telescope studying properties of NEOs

This is part of a series of updates direct from our Shoemaker NEO Grant winners showing their recent progress in defending the Earth from asteroids, in part using grant money from The Planetary Society. The Shoemaker NEO Grant winners, mostly very talented amateurs with amazing telescopic facilities, do some combination of finding, tracking, and/or characterizing near-Earth objects (NEOs).

This update is from Albino Carbognani a 2013 Shoemaker NEO Grant winner at the Astronomical Observatory of the Autonomous Region of the Aosta Valley (OAVdA) in Italy. Albino Carbognani and his colleagues at OAVdA perform astrometric follow-up observations and physical studies of asteroids.

Astronomical Observatory of the Autonomous Region of the Aosta Valley in the Italian Alps

Astronomical Observatory of the Autonomous Region of the Aosta Valley in the Italian Alps

Astronomical Observatory of the Autonomous Region of the Aosta Valley in the Italian Alps
2013 Shoemaker NEO Grant winner Albino Carbognani and the 0.81 meter telescope at the Astronomical Observatory of the Autonomous Region of the Aosta Valley in the Italian Alps that will be improved through the grant.

With their 2013 Shoemaker NEO Grant they re-aluminized the mirror of their 0.81-meter telescope allowing them to reach dimmer than 21st magnitude objects. More recently they acquired and installed a focal reducer that increased the field of view of the telescope, allowing a larger patch of sky to be observed at any one time.

OAVdA 0.81m telescope mirror before and after re-aluminizing

Astronomical Observatory of the Autonomous Region of the Aosta Valley / Albino Carbognani

OAVdA 0.81m telescope mirror before and after re-aluminizing
The 0.81 meter primary mirror before (right) and after (left) re-aluminizing at The Astronomical Observatory of the Autonomous Region of the Aosta Valley (OAVdA). Re-aluminizing made possible by a Planetary Society Shoemaker NEO Grant.

Here's what Albino had to say about their activities through about the end of 2014:

According to the latest update, after the aluminum coating of the mirrors of the Main Telescope and the realignment of the optics, had been pending the focal reducer. The lenses for the focal reducer, built by the company SILO (Florence, Italy), were delivered in December 2013. The aluminum cell of the focal reducer was built and installed on September 2014 by the technician of the INAF-Astronomical Observatory of Turin, and now the reducer is operational as expected.

During the period January to December 2014, with the Main Telescope (RC 0.81-m, f/8 + CCD), we made a number of follow-up observations of the possible NEOs shown in the NEOCP (NEO Confirmation Page) of the Minor Planet Center. The published Minor Planet Electronic Circular and the Daily Orbit Update are shown in the below table:

 MPEC 2014  A44 : 2014 AA17
 MPEC 2014  B65 : 2014 BD33
 MPEC 2014  B72 : 2014 BS43
 MPEC 2014  E59 : 2014 EP12
 MPEC 2014  P35 : 2014 PG51
 MPEC 2014  S109: 2014 SS261
 MPEC 2014  S111: 2014 SU261
 MPEC 2014  S113: 2014 SV261
 MPEC 2014  S115: COMET P/2014 S4 (GIBBS)
 MPEC 2014  S119: 2014 SJ262
 MPEC 2014  R48 : DAILY ORBIT UPDATE (2014 SEPT. 5 UT)
 MPEC 2014  R56 : DAILY ORBIT UPDATE (2014 SEPT. 6 UT)
 MPEC 2014  U54 : DAILY ORBIT UPDATE (2014 OCT. 25 UT)
 MPEC 2014  U85 : DAILY ORBIT UPDATE (2014 OCT. 27 UT)
 MPEC 2014  U101: DAILY ORBIT UPDATE (2014 OCT. 28 UT)

 

In October 2014 we published the paper: A. Carbognani, “Asteroids Lightcurves at OAVDA: December 2013 - June 2014”, Minor Planet Bulletin Vol. 41, n. 4, 265-270, October-December 2014. This paper contains the results of photometric observations of twelve asteroids (8 NEAs and 4 MBAs), and at the end there is the following acknowledgement:

Thanks to the Planetary Society for the award of the 2013 Shoemaker NEO Grant to OAVdA which made it possible to upgrade the telescope used to observe the NEAs.

In the months of October and November 2014 the Main Telescope was used for a thesis of a student of the Physics Department of Turin University. The aim of the thesis was to determine the rotation period of some NEAs, (4401) Aditi, 1998 SS49 and 2014 VQ who have the flyby with the Earth. These asteroids are difficult to observe because of the small size and the high angular velocity which obliges to use very short exposure times and frequently change the field of view. The following rotation parameters were obtained:

Asteroid  Type  Period (hours)  Amplitude (mag)
 (4401) Aditi  Amor  6.673 ± 0.002  0.24
 (85713) 1998 SS49  Apollo-PHA  5.997 ± 0.008  0.13
 2014 VQ  Amor  0.1161 ± 0.0001  0.75

 

The rotation period and the amplitude of the light curve can give information on the shape and the internal structure of an asteroid. Note the very short rotation period of 2014 VQ (see below figure), well below the value of 2.2 h which is the spin-barrier value for the transition from rubble-pile objects to monolithic objects. 2014 VQ is a relatively large asteroid to be so fast and the light curve is single periodic, i.e. there is no sign of a possible complex rotation.

These results will be presented at the next Planetology Congress in Italy, which will be held in the city of Bormio (February 2 to 6, 2015).

Lenses for new focal reducer at OAVdA

Astronomical Observatory of the Autonomous Region of the Aosta Valley / Albino Carbognani

Lenses for new focal reducer at OAVdA
A Shoemaker NEO Grant enabled the Astronomical Observatory of the Autonomous Region of the Aosta Valley (OAVdA) in Italy to purchase lenses for a new focal reducer on their 0.81-meter telescope.
Light curve for asteroid 2014 VQ

Astronomical Observatory of the Autonomous Region of the Aosta Valley / Albino Carbognani

Light curve for asteroid 2014 VQ
Light curve of asteroid 2014 VQ showing a very short rotation period, well below the value of 2.2 h which is the spin-barrier value for the transition from rubble-pile objects to monolithic objects. 2014 VQ is a relatively large asteroid to be so fast and the light curve is single periodic, i.e. there is no sign of a possible complex rotation. This light curve was obtained using the 0.81-meter telescope at the Astronomical Observatory of the Autonomous Region of the Aosta Valley, which received improvements made possible by a Planetary Society Shoemaker NEO Grant.

Help The Planetary Society support the hunt for near-Earth asteroids:

Donate to the Shoemaker NEO Grant Program today!

Read more: near-Earth asteroids, Planetary Society Projects, asteroids, explaining science, Planetary Society, Shoemaker NEO Grants, optical telescopes

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Bruce Betts

Director of Science and Technology / LightSail Program Manager for The Planetary Society
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