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Publications Relating to the Discovery

CBET
Minor Planet Bulletin

Central Bureau for Astronomical Telegrams

The discovery was announced via the Central Bureau for Astronomical Telegrams on June 20, 2021 as Electronic Telegram No 4981. Note that a subscription is required to access the published document.

CBET 4981 : 20210620 : (4337) ARECIBO
Electronic Telegram No. 4981
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network

Below is the text of the report submitted for publication.

Report submitted to CBAT: (4337) ARECIBO

David Gault and Peter Nosworthy report the discovery of a satellite of the minor
planet (4337) Arecibo, from the occultation of the star UCAC4 323-126197 on 2021
May 19.74861. The observers were separated by 0.7 km across the occultation path,
and 18 km along the path. Both observations were made using GPS time-stamped video.

Both observers recorded two occultation events with the following characteristics.

Observer         Location                 Chord Lengths
                 (Australia)            Main body    Satellite
D Gault          Hawkesbury Heights      18.7 km      5.6 km
P Nosworthy      Hazelbrook              19.7 km      2.6 km







Richard Nolthenius and Kirk Bender report the confirmation of the satellite from
the occultation of the star UCAC4 322-116848 on 2021 June 9.45736. The observers
were separated by 8.2 km across the occultation path, and 8 km along the path.
Both observations were made using GPS time-stamped video.

Both observers recorded two occultation events with the following characteristics.

Observer         Location                  Chord Lengths
                 (California)            Main body    Satellite
R Nolthenius     San Ardo                 23.9 km      11.7 km
K Bender         Bradley                  20.8 km      13.0 km







The sizes of both the main body and the satellite were poorly determined by the
first occultation, because of the close across-path separation of the observers.
The sizes of both bodies were well determined from the second occultation, because
the across-path separation was larger, and the chords were favourably positioned
against both bodies. On the assumption that the bodies presented a circular
profile, the diameters determined from the second occultation are:

   Main body  24.3 ± 0.6 km
   Satellite  13.0 ± 1.5 km

These diameters were used to derive the position of the satellite relative to the
main body, for both occultations. Those positions are:

   2021 May 19.74861 25.5 ±1.0 mas in PA 105.2° ±1.0°
   2021 June 9.45736 32.8 ±0.7 mas in PA  94.3° ±2.7°