IOTA/IOTA-ES occultation update for (4417) Lecar / TYC 1954-00455-1 event on 2012 Dec 02, 00:39 UT Visible from S Africa Summary ------- On 2012 Dec 02 UT, the 17 km diameter asteroid (4417) Lecar will occult a 10.5 mag star in the constellation Cancer for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 16.4 mag (the magnitude of the asteroid) for at most 3.9 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: 13 * date and approx. time of event: 2012 Dec 02, 00:18 - 2012 Dec 02, 00:45 UT * geocentric midpoint of event [JD]: 2456263.528 * magnitude of target star: 10.5 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 3.9 * Moon: 90 % sunlit, 30° distance * Sun: 116° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 5.28 * 1 sigma uncertainty interval [seconds]: +/- 19.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .047", 115° ) * approx speed of asteroid's shadow [km/s]: 4.2239 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1954-00455-1 by 4417 Lecar on 2012 Dec 2 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 - 1 0 0 -40 58 19 0 18 34 0 54 -27 -41 4 42 -40 51 57 .. .. .. .. .. .. 0 0 0 -40 25 25 0 18 35 1 54 -27 -40 31 48 -40 19 3 -41 39 44 .. .. .. 1 0 0 -39 52 3 0 18 35 2 53 -28 -39 58 27 -39 45 40 -41 6 29 .. .. .. 2 0 0 -39 18 13 0 18 37 3 52 -28 -39 24 37 -39 11 49 -40 32 47 .. .. .. 3 0 0 -38 43 55 0 18 38 4 52 -29 -38 50 20 -38 37 31 -39 58 37 .. .. .. 4 0 0 -38 9 11 0 18 41 5 51 -29 -38 15 37 -38 2 46 -39 23 59 -36 55 27 5 0 0 -37 34 1 0 18 43 6 51 -29 -37 40 27 -37 27 35 -38 48 55 -36 20 11 6 0 0 -36 58 26 0 18 47 7 50 -30 -37 4 52 -36 51 59 -38 13 25 -35 44 30 7 0 0 -36 22 25 0 18 51 8 49 -30 -36 28 52 -36 15 59 -37 37 29 -35 8 25 8 0 0 -35 46 1 0 18 55 9 49 -31 -35 52 29 -35 39 35 -37 1 10 -34 31 57 9 0 0 -35 9 15 0 19 0 10 48 -31 -35 15 42 -35 2 47 -36 24 27 -33 55 6 10 0 0 -34 32 6 0 19 6 11 47 -31 -34 38 34 -34 25 39 -35 47 21 -33 17 55 11 0 0 -33 54 36 0 19 12 12 47 -32 -34 1 5 -33 48 9 -35 9 54 -32 40 22 12 0 0 -33 16 47 0 19 19 13 46 -32 -33 23 15 -33 10 19 -34 32 7 -32 2 31 13 0 0 -32 38 39 0 19 27 14 46 -32 -32 45 7 -32 32 11 -33 54 0 -31 24 22 14 0 0 -32 0 13 0 19 35 15 45 -32 -32 6 42 -31 53 45 -33 15 34 -30 45 55 15 0 0 -31 21 31 0 19 44 16 44 -33 -31 28 0 -31 15 3 -32 36 52 -30 7 14 16 0 0 -30 42 35 0 19 54 17 44 -33 -30 49 3 -30 36 7 -31 57 55 -29 28 17 17 0 0 -30 3 24 0 20 4 19 43 -33 -30 9 52 -29 56 56 -31 18 43 -28 49 8 18 0 0 -29 24 1 0 20 15 20 43 -33 -29 30 29 -29 17 34 -30 39 18 -28 9 48 19 0 0 -28 44 28 0 20 27 21 42 -33 -28 50 56 -28 38 0 -29 59 41 -27 30 17 20 0 0 -28 4 45 0 20 39 22 42 -33 -28 11 13 -27 58 18 -29 19 55 -26 50 38 21 0 0 -27 24 55 0 20 53 23 41 -33 -27 31 22 -27 18 28 -28 40 0 -26 10 51 22 0 0 -26 44 59 0 21 7 24 40 -33 -26 51 25 -26 38 32 -27 59 59 -25 31 0 23 0 0 -26 4 58 0 21 21 25 40 -33 -26 11 24 -25 58 32 -27 19 52 -24 51 4 24 0 0 -25 24 54 0 21 36 26 39 -33 -25 31 20 -25 18 29 -26 39 42 -24 11 7 25 0 0 -24 44 50 0 21 52 27 38 -33 -24 51 15 -24 38 25 -25 59 31 -23 31 9 26 0 0 -24 4 46 0 22 9 29 38 -33 -24 11 10 -23 58 22 -25 19 19 -22 51 13 27 0 0 -23 24 44 0 22 27 30 37 -33 -23 31 8 -23 18 21 -24 39 9 -22 11 19 28 0 0 -22 44 47 0 22 45 31 37 -33 -22 51 10 -22 38 25 -23 59 3 -21 31 31 29 0 0 -22 4 56 0 23 4 32 36 -33 -22 11 18 -21 58 34 -23 19 2 -20 51 49 30 0 0 -21 25 13 0 23 23 33 35 -33 -21 31 34 -21 18 52 -22 39 8 -20 12 16 31 0 0 -20 45 39 0 23 43 34 34 -32 -20 51 59 -20 39 19 -21 59 23 -19 32 53 32 0 0 -20 6 17 0 24 4 35 34 -32 -20 12 36 -19 59 58 -21 19 50 -18 53 42 33 0 0 -19 27 7 0 24 26 36 33 -32 -19 33 26 -19 20 49 -20 40 28 -18 14 44 34 0 0 -18 48 13 0 24 48 37 32 -32 -18 54 30 -18 41 56 -20 1 21 -17 36 2 35 0 0 -18 9 36 0 25 11 39 32 -31 -18 15 52 -18 3 20 -19 22 31 -16 57 38 36 0 0 -17 31 17 0 25 34 40 31 -31 -17 37 32 -17 25 2 -18 43 58 -16 19 32 37 0 0 -16 53 18 0 25 58 41 30 -30 -16 59 32 -16 47 5 -18 5 45 -15 41 47 38 0 0 -16 15 41 0 26 22 42 29 -30 -16 21 54 -16 9 29 -17 27 54 -15 4 24 39 0 0 -15 38 28 0 26 48 43 28 -30 -15 44 39 -15 32 17 -16 50 25 -14 27 25 40 0 0 -15 1 39 0 27 13 44 27 -29 -15 7 49 -14 55 30 -16 13 21 -13 50 52 41 0 0 -14 25 17 0 27 39 45 26 -29 -14 31 26 -14 19 9 -15 36 44 -13 14 45 42 0 0 -13 49 24 0 28 6 46 25 -28 -13 55 31 -13 43 17 -15 0 35 -12 39 7 43 0 0 -13 14 0 0 28 33 47 24 -27 -13 20 6 -13 7 55 -14 24 54 -12 3 59 44 0 0 -12 39 7 0 29 0 48 23 -27 -12 45 12 -12 33 3 -13 49 45 -11 29 22 45 0 0 -12 4 46 0 29 28 49 22 -26 -12 10 50 -11 58 44 -13 15 8 -10 55 18 46 0 0 -11 31 0 0 29 56 50 21 -26 -11 37 1 -11 24 58 -12 41 4 -10 21 47 47 0 0 -10 57 48 0 30 25 51 20 -25 -11 3 48 -10 51 48 -12 7 35 - 9 48 51 48 0 0 -10 25 12 0 30 54 52 18 -24 -10 31 10 -10 19 13 -11 34 42 - 9 16 32 49 0 0 - 9 53 13 0 31 23 52 17 -24 - 9 59 10 - 9 47 16 -11 2 26 - 8 44 50 50 0 0 - 9 21 52 0 31 52 53 16 -23 - 9 27 48 - 9 15 57 -10 30 48 - 8 13 46 51 0 0 - 8 51 11 0 32 22 54 14 -22 - 8 57 5 - 8 45 17 - 9 59 50 - 7 43 21 52 0 0 - 8 21 9 0 32 52 55 13 -21 - 8 27 2 - 8 15 17 - 9 29 31 - 7 13 36 53 0 0 - 7 51 49 0 33 22 55 11 -21 - 7 57 41 - 7 45 58 - 8 59 54 - 6 44 33 54 0 0 - 7 23 11 0 33 53 56 10 -20 - 7 29 1 - 7 17 21 - 8 30 59 - 6 16 11 55 0 0 - 6 55 15 0 34 23 57 8 -19 - 7 1 3 - 6 49 26 - 8 2 46 - 5 48 31 56 0 0 - 6 28 2 0 34 54 57 6 -18 - 6 33 49 - 6 22 15 - 7 35 16 - 5 21 34 57 0 0 - 6 1 33 0 35 25 58 4 -17 - 6 7 18 - 5 55 47 - 7 8 31 - 4 55 21 58 0 0 - 5 35 48 0 35 56 58 2 -17 - 5 41 32 - 5 30 4 - 6 42 30 - 4 29 52 59 0 0 - 5 10 48 0 36 27 59 0 -16 - 5 16 31 - 5 5 6 - 6 17 15 - 4 5 8 60 0 0 - 4 46 34 0 36 58 59 358 -15 - 4 52 16 - 4 40 53 - 5 52 45 - 3 41 9 61 0 0 - 4 23 6 0 37 29 59 356 -14 - 4 28 46 - 4 17 26 - 5 29 1 - 3 17 55 62 0 0 - 4 0 23 0 38 0 60 354 -13 - 4 6 2 - 3 54 44 - 5 6 3 - 2 55 28 63 0 0 - 3 38 27 0 38 31 60 352 -12 - 3 44 5 - 3 32 50 - 4 43 53 - 2 33 46 64 0 0 - 3 17 18 0 39 2 60 350 -11 - 3 22 55 - 3 11 42 - 4 22 29 - 2 12 51 65 0 0 - 2 56 56 0 39 33 60 348 -10 - 3 2 31 - 2 51 21 - 4 1 53 - 1 52 42 66 0 0 - 2 37 21 0 40 4 60 346 -9 - 2 42 55 - 2 31 47 - 3 42 5 - 1 33 21 67 0 0 - 2 18 34 0 40 35 60 344 -9 - 2 24 7 - 2 13 1 - 3 23 4 - 1 14 46 68 0 0 - 2 0 34 0 41 5 60 342 -8 - 2 6 6 - 1 55 2 - 3 4 52 - 0 56 58 69 0 0 - 1 43 21 0 41 36 60 340 -7 - 1 48 52 - 1 37 51 - 2 47 27 - 0 39 58 70 0 0 - 1 26 57 0 42 7 60 338 -6 - 1 32 27 - 1 21 27 - 2 30 50 - 0 23 45 71 0 0 - 1 11 20 0 42 37 60 336 -5 - 1 16 49 - 1 5 51 - 2 15 2 - 0 8 19 72 0 0 - 0 56 31 0 43 7 60 334 -4 - 1 1 59 - 0 51 3 - 2 0 2 0 6 19 73 0 0 - 0 42 30 0 43 37 59 332 -3 - 0 47 57 - 0 37 3 - 1 45 50 0 20 11 74 0 0 - 0 29 16 0 44 7 59 330 -2 - 0 34 42 - 0 23 50 - 1 32 27 0 33 14 75 0 0 - 0 16 50 0 44 37 59 328 -1 - 0 22 16 - 0 11 25 - 1 19 52 0 45 31 76 0 0 - 0 5 12 0 45 6 58 327 0 - 0 10 37 0 0 12 - 1 8 4 0 57 1 Uncertainty in time = +/- 23 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1954-00455-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 17 45.2983 DE: +26 10 28.070 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .021 ) * V mag [mag]: 10.5 * B mag [mag]: 11.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4417) Lecar approx. diameter [km]: 17 approx. diameter ["]: .010 distance from Earth [AU]: 2.23900 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 967 number of rejected observations: 22 time covered by the observations: 1931 Mar 18 - 2012 Mar 13 1 sigma uncertainty ellipse (major, minor, PA): 0.058, 0.042, 117° remarks: * orbital elements for (4417) Lecar : Mean anomaly = 265.25315276 deg Arg. of pericenter = 225.20593311 deg Long. of node = 356.31683000 deg Inclination = 9.00894428 deg Eccentricity = 0.10498434 Semimajor axis = 2.75851249 AU Perihelion dist = 2.46891188 AU Mag: H = 11.83, G = 0.15 Epoch of elements : MJD 56263.02700000 TDT (2012 Dec 02.027) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 2 4417 Lecar 0h 40.3m UT 10.5 9 17 45.298 26 10 28.07TYC 1954-00455-1 11.4 16.4 17 3.9 2.239 0.664 2.76 58.0902 26.173 167.27 -21.98 0.6720 0.14268 -0.47365 2.27857 0.70143 -0.00519 0.00120 2000 264.60196820121129.00000225.205933356.316830 9.0089440.10498434 2.7585125 2.468911911.5 5.00.15 RATE 2.1512540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.047 115 6.28 0.055 0 0 3 0 056247.0020121202_0455-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 04:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org