PHEMU 2015 - The Bucharest observational campaign Romanian Astronomical Institute of The Romanian...

PHEMU 2015 - PARIS 17-18 SEPTEMBER 2015 1

PHEMU 2015 - The Bucharest observational campaignRomanian Astronomical Institute of The Romanian Academy - AIRA

ADRIAN SONKA, MARCEL POPESCU, DAN ALIN NEDELCU, MIREL BIRLAN


The Romanian Astronomical Institute of Romanian Academy

Main building Building of 0.5 meter telescope


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


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


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 IVI+II


PHEMU PhotometryFor 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 eclipse3ecl1 – 16.02.2015

Photometry during an occultation3occ1 – 16.02.2015


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


Our seeing – FWHM plot may 2014 – apr 2015

• FWHM measured for 10052 images

• Air mass not accounted

Cassegrain 0.5 m, f/15, SBIG STL11000MA. Sonka, M. Popescu, A. Nedelcu


PHEMU 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


PHEMU 2015 light curves

Light curves of phenomena observed at Romanian Astronomical Institute of The Romanian Academy


PHEMU UT Start UT End Exp. time [s]

Measured satellite

Reference Satellite

Altitude [°]

Delta mag calculated -

IMCCE

Delta mag observed – unfiltered

ToM observed [JD]

3occ1 2014-12-22T01:07:06.000 2014-12-22T02:44:50.000 0.5 3 and 1 2 60 0.46 0.46 2457013.5924

3ecl1 2015-02-02T18:15:44.414 2015-02-02T18:40:04.803 0.5 3 and 1 2 29 0.49 0.27 2457056.2646

3occ1 2015-02-02T18:15:44.414 2015-02-02T18:40:04.803 0.5 3 and 1 2 29 0.26 0.3 2457056.2742

3occ1 2015-02-16T23:03:23.000 2015-02-16T23:37:31.000 0.1 3 and 1 2 56 0.45 0.55 2457070.4734

3ecl1 2015-02-16T23:38:09.000 2015-02-17T00:03:09.000 0.1 1 2 52 0.57 2.23 2457070.4974

4occ2 2015-02-26T19:52:54.000 2015-02-26T20:41:47.000 0.1 4 and 2 3 62 0.17 0.22 2457080.3528

1occ2 2015-02-26T22:14:12.000 2015-02-26T22:27:06.000 0.1 1 and 2 3 58 0.10 0.1 2457080.4314

4ecl2 '2015-02-26T22:40:35.000 2015-02-26T22:59:40.000 0.1 2 3 55 0.95 0.8 2457080.4503

4ecl1 2015-02-26T23:37:25.000 2015-02-26T23:53:58.000 1 1 3 46 0.07 not detected -

1ecl2 2015-03-23T18:40:58.000 2015-03-23T18:53:07.000 0.1 2 3 65 0.63 1.4 2457105.2840


Other interests• Minor planet photometry, spectroscopy


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


(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, 9TH 2014


LCDB (Rev. 2015-May); Warner et al., 2009

Rotation Period: 2.3192 h LCDB (Rev. 2015-May); Warner et al., 2009


(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, 29TH 2014


Rotation Period: 33: h [Behrend, R. (2005) Observatoire de Geneve


(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, 5TH 2014


(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, 20TH 2015


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


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


Spectroscopy

Successful observing runs in Feb 6 & 7, 2015, first spectrum of this PHA


Analysis

- BL86 is V-type asteroidMineralogical analysis: 2004 BL86 has a basaltic mineralogyThermal albedo of BL86 help in deriving a diameter of 290 ± 20 m.


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!


Astronomy & Astrophysics, August, 2015

PHEMU 2015 - The Bucharest observational campaign Romanian Astronomical Institute of The Romanian...

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