IOTA/IOTA-ES occultation update for (467) Laura / UCAC2 18737742 event on 2009 Jun 03, 18:47 UT Visible from Summary ------- On 2009 Jun 03 UT, the 42 km diameter asteroid (467) Laura will occult a 11.6 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 15.2 mag (the magnitude of the asteroid) for at most 3.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 42 * date and approx. time of event: 2009 Jun 03, 18:39 - 2009 Jun 03, 18:55 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 3.3 * Moon: 85 % sunlit, 58° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 1.57 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .041", 88° ) * approx speed of asteroid's shadow [km/s]: 12.6725 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 18737742 by 467 Laura on 2009 Jun 3 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 2 0 0 1 56 44 18 55 30 0 121 -14 .. .. .. 1 43 22 .. .. .. 1 1 23 3 0 0 1 19 46 18 55 30 1 122 -15 1 33 8 1 6 23 2 15 8 0 24 25 4 0 0 0 42 49 18 55 30 2 122 -17 0 56 11 0 29 27 1 38 10 - 0 12 31 5 0 0 0 5 54 18 55 29 4 122 -18 0 19 16 - 0 7 27 1 1 14 - 0 49 24 6 0 0 - 0 30 57 18 55 29 5 122 -19 - 0 17 35 - 0 44 18 0 24 22 - 1 26 13 7 0 0 - 1 7 43 18 55 28 6 122 -20 - 0 54 22 - 1 21 3 - 0 12 26 - 2 2 57 8 0 0 - 1 44 23 18 55 27 7 121 -21 - 1 31 2 - 1 57 43 - 0 49 9 - 2 39 34 9 0 0 - 2 20 55 18 55 25 8 121 -22 - 2 7 36 - 2 34 15 - 1 25 44 - 3 16 4 10 0 0 - 2 57 20 18 55 24 9 121 -24 - 2 44 1 - 3 10 39 - 2 2 12 - 3 52 26 11 0 0 - 3 33 36 18 55 22 11 121 -25 - 3 20 18 - 3 46 53 - 2 38 31 - 4 28 38 12 0 0 - 4 9 41 18 55 20 12 121 -26 - 3 56 24 - 4 22 57 - 3 14 40 - 5 4 39 13 0 0 - 4 45 34 18 55 18 13 121 -27 - 4 32 18 - 4 58 50 - 3 50 38 - 5 40 28 14 0 0 - 5 21 15 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51 - 7 1 10 - 8 50 10 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 18737742 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 47 22.9980 DE: -31 27 45.375 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .032 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (467) Laura approx. diameter [km]: 42 approx. diameter ["]: .026 distance from Earth [AU]: 2.23800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 798 number of rejected observations: 35 time covered by the observations: 1901 Jan 09 - 2008 Jan 16 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.025, 87° remarks: * orbital elements for (467) Laura : Mean anomaly = 214.42254966 deg Arg. of pericenter = 92.16988185 deg Long. of node = 322.62119345 deg Inclination = 6.45131985 deg Eccentricity = 0.11227232 Semimajor axis = 2.94167675 AU Perihelion dist = 2.61140786 AU Mag: H = 10.77, G = 0.15 Epoch of elements : MJD 54985.78300000 TDT (2009 Jun 03.783) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 3 467 Laura 18h 47.1m UT 11.6 17 47 22.998-31 27 45.37UCAC2 18737742 0.0 15.2 42 3.3 2.238 -2.197 0.60 92.7114 -31.463 -102.22 22.40 18.7853 0.00061 0.01889 -7.15111 0.15048 -0.00134 0.00080 2000 213.2928462009 529.00000 92.169882322.621193 6.4513200.11227232 2.9416768 2.611407910.5 5.00.15 RATE 1.9534920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.041 88 2.57 0.041 0 54545.5020090603_737742 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org