IOTA/IOTA-ES occultation update for (1176) Lucidor / 2UCAC 21145915 event on 2008 May 18, 23:05 UT Visible from Africa Summary ------- On 2008 May 18 UT, the 31 km diameter asteroid (1176) Lucidor will occult a 11.3 mag star in the constellation Ophiuchus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.7 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: 33 * date and approx. time of event: 2008 May 18, 22:57 - 2008 May 18, 23:14 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 2.7 * Moon: 99 % sunlit, 35° distance * Sun: 156° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 2.02 * 1 sigma uncertainty interval [seconds]: +/- 6.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .040", 88° ) * approx speed of asteroid's shadow [km/s]: 11.3114 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 21145915 by 1176 Lucidor on 2008 May 18 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 - 45 0 0 18 18 47 23 14 52 0 118 -24 .. .. .. 18 9 5 .. .. .. 17 29 58 - 44 0 0 17 48 34 23 14 52 1 118 -25 17 58 17 17 38 51 18 37 35 16 59 42 - 43 0 0 17 18 10 23 14 52 2 118 -26 17 27 53 17 8 27 18 7 13 16 29 16 - 42 0 0 16 47 35 23 14 51 3 119 -27 16 57 19 16 37 52 17 36 40 15 58 39 - 41 0 0 16 16 51 23 14 50 4 119 -28 16 26 35 16 7 7 17 5 58 15 27 53 - 40 0 0 15 45 58 23 14 50 5 119 -29 15 55 42 15 36 14 16 35 6 14 56 59 - 39 0 0 15 14 57 23 14 48 7 119 -30 15 24 42 15 5 13 16 4 7 14 25 57 - 38 0 0 14 43 49 23 14 47 8 120 -31 14 53 34 14 34 5 15 33 0 13 54 49 - 37 0 0 14 12 35 23 14 46 9 120 -32 14 22 20 14 2 51 15 1 46 13 23 34 - 36 0 0 13 41 16 23 14 44 10 120 -33 13 51 1 13 31 32 14 30 27 12 52 15 - 35 0 0 13 9 52 23 14 42 11 120 -34 13 19 37 13 0 8 13 59 4 12 20 51 - 34 0 0 12 38 25 23 14 40 12 121 -36 12 48 10 12 28 41 13 27 36 11 49 24 - 33 0 0 12 6 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45 16 104 0 0 - 9 40 1 22 57 29 27 245 -4 - 9 30 58 - 9 49 4 - 8 54 21 -10 25 34 105 0 0 - 9 19 47 22 57 25 26 245 -3 - 9 10 43 - 9 28 51 - 8 34 0 -10 5 26 106 0 0 - 8 59 6 22 57 20 25 245 -2 - 8 50 1 - 9 8 12 - 8 13 13 - 9 44 52 107 0 0 - 8 38 0 22 57 16 24 245 -1 - 8 28 53 - 8 47 6 - 7 52 0 - 9 23 51 Uncertainty in time = +/- 7 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: 2UCAC 21145915 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 24 45.9683 DE: -26 12 00.516 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .031 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1176) Lucidor approx. diameter [km]: 31 approx. diameter ["]: .020 distance from Earth [AU]: 2.12400 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 835 number of rejected observations: 53 time covered by the observations: 1927 Jan 29 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.025, 87° remarks: * orbital elements for (1176) Lucidor : Mean anomaly = 188.68063724 deg Arg. of pericenter = 155.25963365 deg Long. of node = 272.49822936 deg Inclination = 6.65945754 deg Eccentricity = 0.14355051 Semimajor axis = 2.69259033 AU Perihelion dist = 2.30606760 AU Mag: H = 11.38, G = 0.15 Epoch of elements : MJD 54604.96200000 TDT (2008 May 18.962) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 18 1176 Lucidor 23h 5.6m UT 11.3 17 24 45.968-26 12 0.522UCAC 21145915 0.0 15.5 31 2.7 2.124 -1.938 4.40 37.7818 -26.201 -167.29 19.80 23.0940 0.03147 0.18519 -6.29550 1.06208 -0.00226 0.00041 2000 187.5737452008 514.00000155.259634272.498229 6.6594580.14355051 2.6925903 2.306067610.9 5.00.15 RATE 2.2307380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.040 88 3.02 0.041 0 54594.5020080518_145915 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org