1304 Arosa photometry

1304 Arosa asteroid is yet another main belt object that orbits the Sun. It orbits around Solar System central star in 5 years and 9 months. Arosa diameter is estimated to 40km, and it is actually pretty faint – apparent magnitude is about 14 mag. It was discovered in 1928, and its name comes from Swiss mountain village Arosa.

Last two nights were actually first nights this year I was able to plan some observations and also complete them 🙂 Conditions were not perfect, transparency was poor due to high clouds presence, so photometric quality is not high plus at current orientation amplitude of changes is about 0.1mag. Nevertheless I was able to collect about 5 hours of exposures that is about 2/3 of asteroid rotational period. At that time Arosa was moving near border between Ursa Major and Leo constellations. During 5 hours it travelled about 315,000 km.

1304 Arosa lightcurve
Stacked capture data with asteroid path
Technical data:


Date: 26.02.2019
Location: Nieborowice, Poland
Telescope: Meade ACF 10"
Corrector: AP CCDT67
Camera: QHY163M, gain 100
Mount: SW EQ6
Guiding: SW 80/400 + ASI290MM
Exposures: 150 x 120s, L filter
Conditions: suburban sky, seeing good, transparency poor

Reference star: UCAC4-604-048321 (13.92mag)

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