Back at Kalbarri

Back at Kalbarri in Westen Australia’s mid-west region for a family holiday, I’ve been snapping some new pics of the area. Fitting photography in around a 1 year old’s eat and sleep routine is not impossible but it does preclude photography at one of the ideal times of day: evening/sunset. So, we make do with what we can!

Kalbarri Jetty (Murchison River)

Sunset rock pool at Kalbarri
Sunset rocks and water at Kalbarri

Morning Storm Clouds

Early morning storm clouds in the Perth Hills, Western Australia. 2nd January 2016.
Early morning storm clouds in the Perth Hills, Western Australia. 2nd January 2016.
Early morning storm clouds in the Perth Hills, Western Australia. 2nd January 2016.
Early morning storm clouds in the Perth Hills, Western Australia. 2nd January 2016.
Early morning storm clouds in the Perth Hills, Western Australia. 2nd January 2016.
Early morning storm clouds in the Perth Hills, Western Australia. 2nd January 2016.

This morning (2nd January 2016) there was a series of small storm cells that passed over the Perth Hills. The low angle of the ealry morning sun made for some nice photographs.

8474 RETTIG binary system discovery

Minor Planet 8474 Rettig from Roger Groom on Vimeo.

Video sequence of the minor planet 8474 Rettig moving across the night sky.

8474 Rettig - 2015-07-11T10:43 UTC
8474 Rettig – 2015-07-11T10:43 UTC

I often participate in astronomical research by way of providing observations to other amateurs and to professionals. The promise is always there of credit for the observations but rarely has it actually eventuate in to anything published with my name on it. Here’s one from recently I’m happy to be involved in and credited for my participation (which was a small but useful contribution):

See it on CBAT

Electronic Telegram No. 4122
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; 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
(8474) RETTIG
V. Chiorny, Kharkiv Observatory; V. Benishek, Belgrade Astronomical
Observatory, Serbia; P. Pravec and P. Kusnirak, Ondrejov Observatory;
Yu. N. Krugly, Kharkiv Observatory; J. Oey and R. Groom, Blue Mountains
Observatory, Leura, NSW, Australia; V. Reddy, Planetary Science Institute;
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
W. Cooney and J. Gross, Sonoita Research Observatory, Sonoita, AZ, U.S.A.;
D. Terrell, Southwest Research Institute; R. Inasaridze, V. Ayvazian and
V. Zhuzhanidze, Abastumani Observatory; R. Montaigut and A. Leroy, OPERA
Observatory, France; and I. Molotov, Keldysh Institute of Applied
Mathematics, Moscow, report that photometric observations obtained during
May 19-July 23 reveal that minor planet (8474) is a binary system with an
orbital period of 30.54 +/- 0.01 hr. Mutual eclipse/occultation events
that are 0.60- to 0.93-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.86. Rotations of the
components appear to be synchronous with the orbital motion and an
amplitude of the combined primary plus secondary rotational lightcurve is
0.34 mag at solar phases 7-15 deg.

NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2015 CBAT
2015 July 26 (CBET 4122) Daniel W. E. Green