IOTA/IOTA-ES occultation update for (286) Iclea / TYC 0401-01814-1 event on 2008 May 11, 17:52 UT Visible from Madagascar Summary ------- On 2008 May 11 UT, the 94 km diameter asteroid (286) Iclea will occult a 12.1 mag star in the constellation Ophiuchus for observers along a path across Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 14.1 mag (the magnitude of the asteroid) for at most 9.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2008 May 11, 17:45 - 2008 May 11, 18:00 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 9.2 * Moon: 46 % sunlit, 121° distance * Sun: 143° distance * rough path description: Madagascar The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .024", 96° ) * approx speed of asteroid's shadow [km/s]: 10.1967 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0401-01814-1 by 286 Iclea on 2008 May 11 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 32 0 0 -16 35 52 18 0 35 0 89 -36 -16 1 1 -17 11 4 .. .. .. -17 43 45 33 0 0 -16 35 20 18 0 35 1 89 -37 -16 0 30 -17 10 31 .. .. .. -17 43 11 34 0 0 -16 35 25 18 0 34 2 88 -38 -16 0 36 -17 10 35 .. .. .. -17 43 14 35 0 0 -16 36 8 18 0 34 3 88 -39 -16 1 18 -17 11 17 .. .. .. -17 43 56 36 0 0 -16 37 27 18 0 33 4 88 -40 -16 2 38 -17 12 36 -15 30 53 -17 45 15 37 0 0 -16 39 23 18 0 32 5 87 -41 -16 4 34 -17 14 32 -15 32 49 -17 47 11 38 0 0 -16 41 56 18 0 30 6 87 -41 -16 7 6 -17 17 6 -15 35 21 -17 49 45 39 0 0 -16 45 6 18 0 29 7 87 -42 -16 10 16 -17 20 16 -15 38 30 -17 52 56 40 0 0 -16 48 52 18 0 27 8 86 -43 -16 14 1 -17 24 3 -15 42 14 -17 56 44 41 0 0 -16 53 15 18 0 25 9 86 -44 -16 18 23 -17 28 27 -15 46 35 -18 1 8 42 0 0 -16 58 14 18 0 22 10 86 -45 -16 23 20 -17 33 27 -15 51 32 -18 6 10 43 0 0 -17 3 49 18 0 20 11 86 -46 -16 28 54 -17 39 4 -15 57 4 -18 11 48 44 0 0 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Uncertainty in time = +/- 5 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 0401-01814-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 24 49.7775 DE: +01 03 19.000 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 12.1 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (286) Iclea approx. diameter [km]: 94 approx. diameter ["]: .054 distance from Earth [AU]: 2.38200 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 717 number of rejected observations: 70 time covered by the observations: 1900 Jul 02 - 2008 May 01 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 101° remarks: * orbital elements for (286) Iclea : Mean anomaly = 245.62554522 deg Arg. of pericenter = 219.34387352 deg Long. of node = 149.22657198 deg Inclination = 17.87641751 deg Eccentricity = 0.03443871 Semimajor axis = 3.19612521 AU Perihelion dist = 3.08605479 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 54597.74500000 TDT (2008 May 11.745) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 11 286 Iclea 17h 53.0m UT 12.1 17 24 49.777 1 3 19.00TYC 0401-01814-1 12.4 14.1 94 9.2 2.382 -1.267 9.53 123.0754 1.052 -89.15 18.11 17.8831 -0.30718 -0.61116 -5.14279 2.58366 -0.00288 -0.00187 2000 244.2895962008 5 4.00000219.343874149.226572 17.8764180.03443871 3.1961252 3.0860548 9.0 5.00.15 RATE 1.7249180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.024 96 1.46 0.025 0 54594.5020080511_1814-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org