PHEMU The Bucharest observational campaign Romanian Astronomical Institute of The Romanian Academy - AIRA ADRIAN SONKA, MARCEL POPESCU, DAN ALIN NEDELCU, MIREL BIRLAN 1 PHEMU PARIS SEPTEMBER 2015

The Romanian Astronomical Institute of Romanian Academy Main building Building of 0.5 meter telescope 2 PHEMU PARIS SEPTEMBER 2015

T05m telescope Zeiss Cassegrain installed in 1964 Primary mirror D = 0,5 m F = 7,5 mm F/D = 15 German Equatorial Mount T05m at work 3 PHEMU PARIS SEPTEMBER 2015

CCD Camera SBIG STL11000M Size of chip: 36.1 x 24.7 mm Size of chip: 4008 x 2745 pixels Pixel size: 9 x 9 µm UBVRI filter system For PHEMU: unfiltered images For PHEMU: binning 2x2 Resolution: 0.5 arcsec/pixel 4 PHEMU PARIS SEPTEMBER 2015

Typical PHEMU image 16.8 x 11.2 arcmin field x2 Integration time: between 0.1 and 1 second Jupiter usually is saturated JupiterII IV I+II 5 PHEMU PARIS SEPTEMBER 2015

PHEMU Photometry For photometry we use Maxim Dl 5 For eclipses: -The measured object: the satellite in eclipse -The Reference object: satellite that does not take part in the eclipse For occultations: -The measured object: the satellites in occultation -The Reference object: satellite that does not take part in the eclipse Photometry during an eclipse 3ecl1 – Photometry during an occultation 3occ1 – PHEMU PARIS SEPTEMBER 2015

Our sky Our telescope is surrounded by trees. The observatory is in a park But the park is only 2 km away from town center Visual magnitude limit is 4 7 PHEMU PARIS SEPTEMBER 2015

Our seeing – FWHM plot may 2014 – apr 2015 FWHM measured for images Air mass not accounted Cassegrain 0.5 m, f/15, SBIG STL11000M A. Sonka, M. Popescu, A. Nedelcu 8 PHEMU PARIS SEPTEMBER 2015

PHEMU PHEMU PARIS SEPTEMBER 2015

PHEMU 2015 We have observed 10 mutual phenomena: - 5 occultations - 5 eclipses ◦4 phenomena involving satellites 3 and 1 ◦1 involving 3 and 2 ◦2 involving 1 and 2 ◦1 involving 4 and 1 ◦2 involving 4 and 2 10 PHEMU PARIS SEPTEMBER 2015

PHEMU 2015 light curves Light curves of phenomena observed at Romanian Astronomical Institute of The Romanian Academy 11 PHEMU PARIS SEPTEMBER 2015

PHEMU 2015 light curves Light curves of phenomena observed at Romanian Astronomical Institute of The Romanian Academy 12 PHEMU PARIS SEPTEMBER 2015

PHEMUUT StartUT End Exp. time [s] Measured satellite Reference Satellite Altitude [°] Delta mag calculated - IMCCE Delta mag observed – unfiltered ToM observed [JD] 3occ T01:07: T02:44: and ecl T18:15: T18:40: and occ T18:15: T18:40: and occ T23:03: T23:37: and ecl T23:38: T00:03: occ T19:52: T20:41: and occ T22:14: T22:27: and ecl2' T22:40: T22:59: ecl T23:37: T23:53: not detected- 1ecl T18:40: T18:53: PHEMU PARIS SEPTEMBER 2015

Other interests Minor planet photometry, spectroscopy 14 PHEMU PARIS SEPTEMBER 2015

Minor planet photometry Between summer of 2014 and autum of 2015 we have observed 7 minor planets (4 NEA and 3 Main Belt) For lightcurve study we use MPO Canopus 15 PHEMU PARIS SEPTEMBER 2015

(137170) 1999 HF1 Observations between nights of observations A total of 22 hours of observations Longest night of 4.4 hours of observations Minor planet magnitude: 15.5 Minor planet phase: 64-79° Exposure 60s, clear filter Results: Period: /- 0,0006 hours Amplitude: 0.22 mag Published in Minor Planet Bulletin Vol. 41, No. 4, pp (2014) 1991 HF1 TRAIL ON JUNE, 9 TH PHEMU PARIS SEPTEMBER 2015

LCDB (Rev May); Warner et al., 2009 Rotation Period: h LCDB (Rev May); Warner et al., PHEMU PARIS SEPTEMBER 2015

(1114) Lorraine Observations between nights of observations A total of 64 hours of observations Longest night of 4.6 hours of observations Minor planet magnitude: 14.5 Minor planet phase: ° Exposure 60s, clear filter Results: Not yet published LORRAINE TRAIL ON AUGUST, 29 TH PHEMU PARIS SEPTEMBER 2015

Rotation Period: 33: h [Behrend, R. (2005) Observatoire de Geneve 19 PHEMU PARIS SEPTEMBER 2015

(2649) Oongaq Observations between nights of observations A total of 72 hours of observations Longest night of 7 hours of observations Minor planet magnitude: 15.4 Minor planet phase: ° Exposure 60s, clear filter Results: Period: / hours Amplitude: 0.44 mag Not yet published OONGAQ TRAIL ON OCTOBER, 5 TH PHEMU PARIS SEPTEMBER 2015

21 PHEMU PARIS SEPTEMBER 2015

(656) Beagle Observations between nights of observations A total of 46 hours of observations Longest night of 5.6 hours of observations Minor planet magnitude: 14 Minor planet phase: ° Exposure 60s, V filter Results: Period: / hours Amplitude: 0,22 mag Not yet published BEAGLE TRAIL ON FEBRUARY, 20 TH PHEMU PARIS SEPTEMBER 2015

23 PHEMU PARIS SEPTEMBER 2015

Efficient network science The case of 2004 BL86 (PHA): - Grazed the Earth : Jan 26, Distance: 1.2 million km. - Discovered in 2004 (LINEAR program) - Estimated diameter: 500m 24 PHEMU PARIS SEPTEMBER 2015

Circumstances Regular awarded observing time: - Isaac Newton telescope (2.5m aperture), Canary (Visible spectroscopy) -IRTF (3m aperture), Hawaii (infrared µm spectroscopy) Remote observing from Paris & Bucharest Cluj-Napoca Observatory performed photometry & derived rotational period for this object 25 PHEMU PARIS SEPTEMBER 2015

Spectroscopy Successful observing runs in Feb 6 & 7, 2015, first spectrum of this PHA 26 PHEMU PARIS SEPTEMBER 2015

Analysis - BL86 is V-type asteroid Mineralogical analysis: 2004 BL86 has a basaltic mineralogy Thermal albedo of BL86 help in deriving a diameter of 290 ± 20 m. 27 PHEMU PARIS SEPTEMBER 2015

Results Spectroscopic analysis diminish by 40% the diameter previously estimated Long term orbital integrations using clones show that 2004 BL86 is highly chaotic No keyhole for hitting the Earth in the next five centuries Next favorable observation of 2004 BL86 in 2050! 28 PHEMU PARIS SEPTEMBER 2015

Astronomy & Astrophysics, August, PHEMU PARIS SEPTEMBER 2015