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PHEMU 2015 - The Bucharest observational campaign Romanian Astronomical Institute of The Romanian Academy - AIRA ADRIAN SONKA, MARCEL POPESCU, DAN ALIN.

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Presentation on theme: "PHEMU 2015 - The Bucharest observational campaign Romanian Astronomical Institute of The Romanian Academy - AIRA ADRIAN SONKA, MARCEL POPESCU, DAN ALIN."— Presentation transcript:

1 PHEMU 2015 - The Bucharest observational campaign Romanian Astronomical Institute of The Romanian Academy - AIRA ADRIAN SONKA, MARCEL POPESCU, DAN ALIN NEDELCU, MIREL BIRLAN 1 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

2 The Romanian Astronomical Institute of Romanian Academy Main building Building of 0.5 meter telescope 2 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

3 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 2015 - PARIS 17-18 SEPTEMBER 2015

4 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 2015 - PARIS 17-18 SEPTEMBER 2015

5 Typical PHEMU image 16.8 x 11.2 arcmin field 0.502 arcsec/pixel @Binning 2x2 Integration time: between 0.1 and 1 second Jupiter usually is saturated JupiterII IV I+II 5 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

6 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 – 16.02.2015 Photometry during an occultation 3occ1 – 16.02.2015 6 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

7 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 2015 - PARIS 17-18 SEPTEMBER 2015

8 Our seeing – FWHM plot may 2014 – apr 2015 FWHM measured for 10052 images Air mass not accounted Cassegrain 0.5 m, f/15, SBIG STL11000M A. Sonka, M. Popescu, A. Nedelcu 8 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

9 PHEMU 2015 9 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

10 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 2015 - PARIS 17-18 SEPTEMBER 2015

11 PHEMU 2015 light curves Light curves of phenomena observed at Romanian Astronomical Institute of The Romanian Academy 11 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

12 PHEMU 2015 light curves Light curves of phenomena observed at Romanian Astronomical Institute of The Romanian Academy 12 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

13 PHEMUUT StartUT End Exp. time [s] Measured satellite Reference Satellite Altitude [°] Delta mag calculated - IMCCE Delta mag observed – unfiltered ToM observed [JD] 3occ12014-12-22T01:07:06.0002014-12-22T02:44:50.0000.53 and 12600.46 2457013.5924 3ecl12015-02-02T18:15:44.4142015-02-02T18:40:04.8030.53 and 12290.490.272457056.2646 3occ12015-02-02T18:15:44.4142015-02-02T18:40:04.8030.53 and 12290.260.32457056.2742 3occ12015-02-16T23:03:23.0002015-02-16T23:37:31.0000.13 and 12560.450.552457070.4734 3ecl12015-02-16T23:38:09.0002015-02-17T00:03:09.0000.112520.572.232457070.4974 4occ22015-02-26T19:52:54.0002015-02-26T20:41:47.0000.14 and 23620.170.222457080.3528 1occ22015-02-26T22:14:12.0002015-02-26T22:27:06.0000.11 and 23580.100.12457080.4314 4ecl2'2015-02-26T22:40:35.0002015-02-26T22:59:40.0000.123550.950.82457080.4503 4ecl12015-02-26T23:37:25.0002015-02-26T23:53:58.000113460.07not detected- 1ecl22015-03-23T18:40:58.0002015-03-23T18:53:07.0000.123650.631.42457105.2840 13 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

14 Other interests Minor planet photometry, spectroscopy 14 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

15 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 2015 - PARIS 17-18 SEPTEMBER 2015

16 (137170) 1999 HF1 Observations between 21.05-14.06.2014 6 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: 2.3188 +/- 0,0006 hours Amplitude: 0.22 mag Published in Minor Planet Bulletin Vol. 41, No. 4, pp. 285-286 (2014) 1991 HF1 TRAIL ON JUNE, 9 TH 2014 16 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

17 LCDB (Rev. 2015-May); Warner et al., 2009 Rotation Period: 2.3192 h LCDB (Rev. 2015-May); Warner et al., 2009 17 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

18 (1114) Lorraine Observations between 29.07-20.10.2014 18 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: -10 - + 17° Exposure 60s, clear filter Results: Not yet published LORRAINE TRAIL ON AUGUST, 29 TH 2014 18 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

19 Rotation Period: 33: h [Behrend, R. (2005) Observatoire de Geneve 19 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

20 (2649) Oongaq Observations between 24.09-19.10.2014 11 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: -14 - + 23° Exposure 60s, clear filter Results: Period: 2.789 +/- 0.006 hours Amplitude: 0.44 mag Not yet published OONGAQ TRAIL ON OCTOBER, 5 TH 2014 20 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

21 21 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

22 (656) Beagle Observations between 10.02-24.03.2015 9 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: -8 - + 9° Exposure 60s, V filter Results: Period: 7.034 +/- 0.003 hours Amplitude: 0,22 mag Not yet published BEAGLE TRAIL ON FEBRUARY, 20 TH 2015 22 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

23 23 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

24 Efficient network science The case of 2004 BL86 (PHA): - Grazed the Earth : Jan 26, 2015 - Distance: 1.2 million km. - Discovered in 2004 (LINEAR program) - Estimated diameter: 500m 24 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

25 Circumstances Regular awarded observing time: - Isaac Newton telescope (2.5m aperture), Canary (Visible spectroscopy) -IRTF (3m aperture), Hawaii (infrared 0.8-2.5 µm spectroscopy) Remote observing from Paris & Bucharest Cluj-Napoca Observatory performed photometry & derived rotational period for this object 25 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

26 Spectroscopy Successful observing runs in Feb 6 & 7, 2015, first spectrum of this PHA 26 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

27 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 2015 - PARIS 17-18 SEPTEMBER 2015

28 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 2015 - PARIS 17-18 SEPTEMBER 2015

29 Astronomy & Astrophysics, August, 2015 29 PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015

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