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56 Hours of Video Survey Data Observed by Using One Telescope

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56 Hours of Video Survey Data Observed by Using One Telescope Lunar Impact workshop ESTEC ESA Center Noordwijk, 2-3 June, 2015 Observation, analysis and results from 56 hours of video survey data observed by using one telescope Ait Moulay Larbi mamoun PhD student Atlas Golf Marrakech Observatory 1 Moroccan Observatories Oukaimeden Observatory Discoveries from Oukaimeden MO““ Neto telesope “ie Otoer, 2011: - 4 comets ! : (C/2013 V5 - P/2013 CE31 - C/2012 CH17 - P/2011 W2) - 3 NEA ! : (420478)2012 EQ1,(421365)2013 TE129 and (421400)2013 VD14 2 Lunar Flashes Observation : Instrumental setup Watec 902H2 Ultimate C14 or C8 Telescope 0.33x or 0.63x Focal reducer Data Acquisition : - high speed and Optics : - “C telesope or . sensitivity sensor (ICX429 EXveiw HAD CCD - 0.33x or 0.63x Focal reducer. technology). Effetie foal legth ≈ -1150 mm. GPS antenna Hight speed Camera Watec 902H USB Videos Time C14 or C8 Celestron Converter inserter Telesope Computer SCT spacer ring AME TIM-10 Focal reducer 0.33x or 0.63x 3 Detections: • From February, 2013 to December, 2014 : (56±2) hours of high quality video data. - VirtualDub Software : PAL interlaced mode (20fps -> i; ideo .avi at ×576 pixels. • LunarScan software is used on recorded videos to perform automated detections. -Search for adjacent pixels that have collected a sudden illumination with values that exceed the threshold value defined by the user. -The dark is subtracted before processing. • We process the analysis to the whole field of the view (without masks), because the coordinates stamped by the time inserter are configured to be displayed blackly, and.. we do not want to miss any impact we want some reference stars near the lunar disk. • False detections: over a thousand detection (more than 90% of them are one frame events • osi ra ad eletroi oise. Different false detections. Each one appeared in one half-frame (20 ms). Flash movement, The full frames are presented here Bright crater indicates a satellite detection 4 • Feb 6, 2013 • Apr 14, 2013 Mag (V): 9.4 Mag (V): 7.6 Dec 25, 2014 Nov 26, 2014 • • Mag (V):9.6 Mag (V) : 7.1 Four multi-frame sporadic flashes • unfavourable lunar phase + inadequate orbital crossing + weather : have prevented us to observe at the peak of meteor showers By using one telescope ,we estimate to have missed more than 4 short flashes (1 frame)5 Multi-frame flash confirmation : • The light source shines at the same pixels cluster (no motion across the successive frames ) • The surface brightness profile • Light curves profile (sudden signal increase followed by a sharp decrease) + + • The magnitude VS flash duration shows a consistency on the trend revealed in Bouley et al,2012 First remarks: • Among the four flashes, three were detected very close to the terminator. - 2nd flash : 09.10°±0.15 W; 3rd flash : 2.5°±1 W; 4th flash : 17.50°±0.5 E • For the 1st and the 2nd flashes, the peak of intensity is reached at the 2nd half-frame. The expansion phase has lasted more than 20 ms 1st flash : 60 ms 2nd flash : 160 ms YANAGISAWA AND KISAICHI 2002 • The 3rd flash was shorter but brighter than the 2nd ! • The 3rd flash has quickly peaked; while the plume of 2nd flash has required twice more time to finish its expansion phase. Dur : 160 ms 2nd flash Mag : 7.6 3rd flash Dur : 120 ms Mag : 7.1 This can be explained by the fact that fastest meteoroids have capacity to produce bright and short flashes as clarified in the work of Bouley et al.,2012 in the case of the Leonid impacts. th rd So, It is more likely that the projectile caused the 4 flash is fastest and which of the 3 is larger.7 Measured parameters : Date and Time Longitude and Latitude Of the site observation Date Time first • The impact time : appearance Raw interlaced frame separate frames Odd row field Even row field 20h 00min 45s 422ms (± 0.01s) 8 Measured parameters : Flash duration ? 1 2 3 4 5 -> 5 × 40 ms = 200 ms positive Raw sub-images ? ? Deinterlaced Sub-images 1 2 3 4 5 6 7 -> 7 × 20 ms = 140 ms Check negative -> 8 × 20 ms = 160 ms Raw sub-images 9 Measured parameters : the impact site (to be presented later) 10 Measured parameters : Magnitude 8-bit frame from Watec; Pretreatment of images (Dark, flat) • Pixel value : 0-255 • Aperture photometry flux= sum of pixels values • flu = flu + akgroud − akgroud istruetal agitude of a flash = −. × log10(flux) • During every night of observation and from time to time we record videos of references stars (with known magnitudes), and we measure their instrumental magnitude . 11 Deduced parameters : Luminous energy of impact • The energy received at Earth [J/m2] is approiated usig Pogso’s forula : -0.4mv E lum_rec = Exposure time × F0 × 10 - Exposure time = 0.02 s - Mv = V magnitude of the flash -8 2 - F0 = 1,5 10 J/m /s, is the flu fro a zero agitude star i the aera’s pass-ad ≈. µ 2 • The radiated energy at the moon is then: E lum_moon = f × π × d × E lum_rec The emission may be considered hemispherical in early stages of the impact and the expansion phase, but ongoing the expansion it is more isotropic if we take in consideration the elevation of the plume above the ground : 2 < f < 3 ƞ the luious effiie The impact energy : E × E • impact = ƞ lum_moon the amount of the initial kinetic energy that is Converted into luminous energy • Nuerial siulatio : . < ƞ < . , Artemieva et al. 2000,2001 • Leonids ipat Oseratio : ƞ =., the aiu alue k/s;Bellot Rubio et al. 2000 • More sars oseratio : ƞ=. -3 exp(-9.32/v2); Swift et al. (2011). 6/2/2015 12 Deduced parameters : Diameter of the produced crater - The diameter of the crater is estimated from the Gault’s scaling law (Melosh, 1989) valid for craters up to 100 m in diameter: • Inputs parameters : 3 - p Projectile density : to be assumed equal to 3.2 g/cm (sporadic asteroids) 3 - t Target density : to be assumed equal to 1.5 g/cm . - g : lunar gravity. - E : impact energy. - θ : impact angel. p and θ are better known if the detection is associated with a known swarm of meteoroids 13 Deduced parameters : The impactor mass • By considering Sporadic meteoroid speed in range between 6 and 34 Km/s (Ivanov (2001)), the impactor mass is: m = 2 × E/V2 The impact velocity is better known if the event is associated with a known swarm of meteoroids - According to the statistics of a large sporadic meteoroid orbit database (Steel 1996; Ivanov 2001). VEarth= 20 km/s at the Earth, V= 16 km/s at the Moon - According to NASA Meteoroids Model : V= 24 km/s at the Earth B osiderig graitatioal fousig it’s aout K/s at Moo surfae Deduced parameters : The impactor size • The mean size of the impactor is deduced from the following equation : 3 -1 D = (6 / ) × m × p 14 Deduced parameters : The Impact rate • At the Moon - The impact rate at the Moon surface is obtained by considering the total survey time (56 hrs), and the average surface monitored (4.8 106 km2). Annual cumulative number of impacts (E) = N(E) × (365,24×24/65) × (37,8/4,8) N(E) is the number of impacts with energy higher than E. • At the Earth -The terrestrial impact flux is obtained by calibrating the lunar rate in terms of Earth collecting area by considering gravitational focusing (Suggs 2014;Jones 2007) Annual Earth flux (Eat_Earth) = lunar flux × (Earth surface × fc /Moon surface) -Where, fc is a correction factor used to consider the effective cross section of impact introduced by the gravitational focusing, it is defined by : -2 fc = 1 + 2(GM/R)×v ≈ 1.3 G is the gravitational constant, M and R are Earth mass and radius (at 100km altitude), v is the speed of the meteoroid (16 km/s). - The gravitational focusing increase the meteoroid speed and impact energy is also corrected : -2 15 Eat_Earth = E × (1 + 2(GM/R)×v ) Discussion and Results • Calculated by assuming a meteoroid speed of 16 km/s and luminous efficiency of 1,5 10-3 • The uncertainties mentioned are associated with the uncertainty of the photometric magnitude only and does not take into account the uncertainty on speed and the luminous efficiency. F 1 F 2 F3 F4 Impact luminous Energy (104 J) 8.2 43 35 4.5 Estimated impact Energy (107 J) 5.4 28.7 23.1 3.0 Estimated mass of impactor (kg) 0.4 2.1 1.2 0.15 Estimated crater diameter (m) 2.6 4.4 4.2 1.8 16 Relative uncertainties : • The impact energy (flash 2) - The uncertainty engendered by the photometric calibration (references stars, camera pass-ad… : % - The uncertainty engendered by the anisotropic factor of emission (2<f<3) : 20% - The uncertainty engendered by impact duration uncertainty : 10 % - The uncertainty engendered by the luminous efficiency : 20% velocity-dependent luminous efficiency. an extremely large variation with velocity in the range of 6 to 15 km/s. Swift et al. (2011). 0.0015 Value used for sporadic impact 0.002 Ƞ maximum value (provided to the fastest Meteoroids leonids17 ) Relative uncertainties : • The impactor mass (flash2) At impact velocity between 6 and 18 km/s, meteoroids with masses between 50 and 500 g can not be monitored by ground based observation, because the impact energy is below the detection limit defined by the instruments used until now. The impact-rate from this impactors class is underestimated. Be careful if you longing for a holiday on the Moon ! 18 Relative uncertainties : -The impact crater size (flash 2) : • Surface gravity : g = 1.6 m/s2 • Projectile density : 3.1 g/cm3 • Target density : 2.2 g/cm3 (Huang and Wieczorek 2012) • Impact angel : θ = 45° 4.57 m D = 4.46 m ± I we consider 4.02 m 4.55 m for θ = 90° D = 4.46 m ± 2.90 m for θ = 20° The crater diameter is mainly affected by uncertainty around the impact angle 5.27 m D = 4.46 m ± 19 3.73 m Discussion and Results • Light curves For long duration flashes, the cooling phase is always longer than the expansion phase.
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