IOTA/IOTA-ES occultation update for (7778) Markrobinson / TYC 2298-01142-1 event on 2012 Aug 12, 01:39 UT Visible from Africa Summary ------- On 2012 Aug 12 UT, the 11 km diameter asteroid (7778) Markrobinson will occult a 9.3 mag star in the constellation Triangulum 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 6.1 mag to 15.4 mag (the magnitude of the asteroid) for at most 1.0 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 Aug 12, 01:29 - 2012 Aug 12, 01:42 UT * geocentric midpoint of event [JD]: 2456151.56897917 * magnitude of target star: 9.3 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 1.0 * Moon: 29 % sunlit, 43° distance * Sun: 102° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 5.16 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .100 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .102", .055", 105° ) * approx speed of asteroid's shadow [km/s]: 10.1418 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2298-01142-1 by 7778 Markrobinson on 2012 Aug 12 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 - 25 0 0 -28 37 7 1 29 33 0 51 -76 -28 41 10 -28 33 4 .. .. .. .. .. .. - 24 0 0 -27 54 10 1 29 33 1 51 -77 -27 58 14 -27 50 7 -28 40 16 .. .. .. - 23 0 0 -27 10 50 1 29 33 3 50 -78 -27 14 54 -27 6 46 -27 56 58 .. .. .. - 22 0 0 -26 27 7 1 29 34 4 50 -78 -26 31 11 -26 23 3 -27 13 17 -25 41 14 - 21 0 0 -25 43 4 1 29 35 5 49 -79 -25 47 8 -25 39 0 -26 29 15 -24 57 9 - 20 0 0 -24 58 40 1 29 36 6 49 -80 -25 2 45 -24 54 36 -25 44 53 -24 12 45 - 19 0 0 -24 14 0 1 29 38 7 48 -80 -24 18 4 -24 9 56 -25 0 13 -23 28 3 - 18 0 0 -23 29 3 1 29 40 8 48 -81 -23 33 7 -23 24 59 -24 15 16 -22 43 7 - 17 0 0 -22 43 52 1 29 42 10 48 -81 -22 47 56 -22 39 47 -23 30 4 -21 57 56 - 16 0 0 -21 58 28 1 29 45 11 47 -81 -22 2 32 -21 54 24 -22 44 39 -21 12 33 - 15 0 0 -21 12 53 1 29 47 12 47 -81 -21 16 57 -21 8 49 -21 59 2 -20 27 0 - 14 0 0 -20 27 10 1 29 50 13 46 -81 -20 31 13 -20 23 6 -21 13 17 -19 41 19 - 13 0 0 -19 41 19 1 29 54 14 46 -81 -19 45 23 -19 37 16 -20 27 23 -18 55 31 - 12 0 0 -18 55 23 1 29 58 16 46 -80 -18 59 27 -18 51 20 -19 41 24 -18 9 39 - 11 0 0 -18 9 25 1 30 2 17 45 -80 -18 13 28 -18 5 22 -18 55 22 -17 23 44 - 10 0 0 -17 23 25 1 30 6 18 45 -79 -17 27 27 -17 19 22 -18 9 18 -16 37 48 - 9 0 0 -16 37 26 1 30 11 19 45 -78 -16 41 28 -16 33 24 -17 23 14 -15 51 54 - 8 0 0 -15 51 29 1 30 16 21 44 -77 -15 55 31 -15 47 28 -16 37 12 -15 6 3 - 7 0 0 -15 5 38 1 30 21 22 44 -76 -15 9 39 -15 1 37 -15 51 15 -14 20 17 - 6 0 0 -14 19 53 1 30 26 23 44 -75 -14 23 54 -14 15 53 -15 5 24 -13 34 38 - 5 0 0 -13 34 17 1 30 32 24 43 -74 -13 38 17 -13 30 17 -14 19 41 -12 49 9 - 4 0 0 -12 48 52 1 30 38 26 43 -73 -12 52 51 -12 44 53 -13 34 8 -12 3 51 - 3 0 0 -12 3 39 1 30 45 27 43 -72 -12 7 38 -11 59 41 -12 48 48 -11 18 45 - 2 0 0 -11 18 41 1 30 52 28 42 -71 -11 22 39 -11 14 43 -12 3 42 -10 33 55 - 1 0 0 -10 33 59 1 30 59 29 42 -70 -10 37 56 -10 30 2 -11 18 52 - 9 49 22 0 0 0 - 9 49 36 1 31 6 30 42 -68 - 9 53 32 - 9 45 39 -10 34 19 - 9 5 7 1 0 0 - 9 5 32 1 31 14 32 41 -67 - 9 9 28 - 9 1 36 - 9 50 7 - 8 21 12 2 0 0 - 8 21 50 1 31 21 33 41 -66 - 8 25 45 - 8 17 55 - 9 6 15 - 7 37 40 3 0 0 - 7 38 32 1 31 29 34 40 -65 - 7 42 26 - 7 34 38 - 8 22 47 - 6 54 31 4 0 0 - 6 55 38 1 31 38 35 40 -64 - 6 59 31 - 6 51 45 - 7 39 44 - 6 11 47 5 0 0 - 6 13 11 1 31 46 37 40 -62 - 6 17 4 - 6 9 19 - 6 57 7 - 5 29 31 6 0 0 - 5 31 13 1 31 55 38 39 -61 - 5 35 4 - 5 27 22 - 6 14 57 - 4 47 42 7 0 0 - 4 49 43 1 32 4 39 39 -60 - 4 53 34 - 4 45 53 - 5 33 17 - 4 6 24 8 0 0 - 4 8 45 1 32 13 40 39 -59 - 4 12 35 - 4 4 56 - 4 52 8 - 3 25 36 9 0 0 - 3 28 19 1 32 23 41 38 -58 - 3 32 7 - 3 24 31 - 4 11 31 - 2 45 21 10 0 0 - 2 48 26 1 32 32 42 38 -56 - 2 52 14 - 2 44 39 - 3 31 27 - 2 5 39 11 0 0 - 2 9 8 1 32 42 44 37 -55 - 2 12 55 - 2 5 22 - 2 51 58 - 1 26 33 12 0 0 - 1 30 26 1 32 52 45 37 -54 - 1 34 11 - 1 26 41 - 2 13 4 - 0 48 2 13 0 0 - 0 52 20 1 33 2 46 36 -53 - 0 56 5 - 0 48 36 - 1 34 47 - 0 10 7 14 0 0 - 0 14 53 1 33 13 47 36 -51 - 0 18 36 - 0 11 9 - 0 57 7 0 27 9 15 0 0 0 21 57 1 33 23 48 35 -50 0 18 14 0 25 39 - 0 20 6 1 3 47 16 0 0 0 58 7 1 33 34 49 35 -49 0 54 25 1 1 48 0 16 15 1 39 45 17 0 0 1 33 36 1 33 44 50 34 -48 1 29 56 1 37 16 0 51 57 2 15 3 18 0 0 2 8 25 1 33 55 51 34 -47 2 4 46 2 12 4 1 26 57 2 49 40 19 0 0 2 42 32 1 34 6 52 33 -46 2 38 54 2 46 10 2 1 16 3 23 36 20 0 0 3 15 58 1 34 17 53 32 -44 3 12 20 3 19 35 2 34 53 3 56 50 21 0 0 3 48 40 1 34 28 54 31 -43 3 45 4 3 52 16 3 7 47 4 29 21 22 0 0 4 20 40 1 34 39 55 31 -42 4 17 5 4 24 15 3 39 58 5 1 10 23 0 0 4 51 56 1 34 51 56 30 -41 4 48 22 4 55 30 4 11 25 5 32 15 24 0 0 5 22 28 1 35 2 57 29 -40 5 18 55 5 26 1 4 42 9 6 2 36 25 0 0 5 52 16 1 35 14 58 28 -39 5 48 44 5 55 48 5 12 8 6 32 13 26 0 0 6 21 20 1 35 25 59 27 -37 6 17 49 6 24 51 5 41 23 7 1 6 27 0 0 6 49 39 1 35 37 60 26 -36 6 46 9 6 53 9 6 9 52 7 29 14 28 0 0 7 17 13 1 35 48 61 24 -35 7 13 44 7 20 43 6 37 37 7 56 38 29 0 0 7 44 3 1 36 0 62 23 -34 7 40 34 7 47 31 7 4 37 8 23 17 30 0 0 8 10 7 1 36 11 62 22 -33 8 6 39 8 13 34 7 30 51 8 49 12 31 0 0 8 35 26 1 36 23 63 20 -32 8 31 59 8 38 53 7 56 21 9 14 21 32 0 0 9 0 0 1 36 35 64 19 -31 8 56 34 9 3 26 8 21 4 9 38 45 33 0 0 9 23 49 1 36 46 65 17 -30 9 20 24 9 27 14 8 45 3 10 2 25 34 0 0 9 46 53 1 36 58 65 16 -28 9 43 28 9 50 17 9 8 16 10 25 19 35 0 0 10 9 11 1 37 10 66 14 -27 10 5 47 10 12 34 9 30 43 10 47 29 36 0 0 10 30 44 1 37 22 66 12 -26 10 27 22 10 34 7 9 52 25 11 8 53 37 0 0 10 51 33 1 37 33 67 10 -25 10 48 11 10 54 54 10 13 22 11 29 33 38 0 0 11 11 36 1 37 45 67 8 -24 11 8 15 11 14 57 10 33 34 11 49 28 39 0 0 11 30 54 1 37 57 68 5 -23 11 27 34 11 34 15 10 53 0 12 8 39 40 0 0 11 49 28 1 38 8 68 3 -22 11 46 8 11 52 48 11 11 42 12 27 5 41 0 0 12 7 17 1 38 20 69 1 -21 12 3 58 12 10 36 11 29 38 12 44 46 42 0 0 12 24 22 1 38 32 69 358 -20 12 21 3 12 27 40 11 46 50 13 1 44 43 0 0 12 40 42 1 38 43 69 356 -19 12 37 24 12 44 0 12 3 17 13 17 57 44 0 0 12 56 18 1 38 55 69 353 -18 12 53 1 12 59 35 12 19 0 13 33 27 45 0 0 13 11 10 1 39 6 69 351 -17 13 7 53 13 14 27 12 33 58 13 48 12 46 0 0 13 25 18 1 39 18 69 348 -16 13 22 2 13 28 34 12 48 12 14 2 14 47 0 0 13 38 42 1 39 29 69 346 -15 13 35 27 13 41 58 13 1 43 14 15 33 48 0 0 13 51 23 1 39 41 69 343 -14 13 48 8 13 54 38 13 14 29 14 28 8 49 0 0 14 3 20 1 39 52 69 341 -13 14 0 5 14 6 35 13 26 31 14 40 0 50 0 0 14 14 34 1 40 3 69 338 -11 14 11 20 14 17 48 13 37 50 14 51 9 51 0 0 14 25 5 1 40 15 69 336 -10 14 21 51 14 28 18 13 48 25 15 1 35 52 0 0 14 34 52 1 40 26 69 334 -9 14 31 39 14 38 6 13 58 17 15 11 18 53 0 0 14 43 57 1 40 37 68 332 -8 14 40 44 14 47 10 14 7 26 15 20 19 54 0 0 14 52 19 1 40 48 68 329 -7 14 49 6 14 55 32 14 15 52 15 28 37 55 0 0 14 59 58 1 40 59 67 327 -6 14 56 46 15 3 11 14 23 35 15 36 13 56 0 0 15 6 55 1 41 10 67 326 -5 15 3 43 15 10 8 14 30 35 15 43 7 57 0 0 15 13 10 1 41 21 66 324 -4 15 9 58 15 16 22 14 36 52 15 49 19 58 0 0 15 18 42 1 41 32 66 322 -3 15 15 30 15 21 54 14 42 27 15 54 49 59 0 0 15 23 32 1 41 43 65 321 -2 15 20 21 15 26 44 14 47 19 15 59 37 60 0 0 15 27 40 1 41 53 65 319 -1 15 24 29 15 30 52 14 51 29 16 3 43 61 0 0 15 31 7 1 42 4 64 318 0 15 27 55 15 34 18 14 54 57 16 7 8 Uncertainty in time = +/- 8 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: TYC 2298-01142-1 * constellation : Triangulum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 46 37.8550 DE: +33 19 31.314 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 9.3 * B mag [mag]: 9.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7778) Markrobinson approx. diameter [km]: 11 approx. diameter ["]: .013 distance from Earth [AU]: 1.15500 * orbital information: orbit source: Preston date of fit: 2012 Jun 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 567 number of rejected observations: 13 time covered by the observations: 1982 May 19 - 2012 May 18 1 sigma uncertainty ellipse (major, minor, PA): 0.101, 0.052, 105° remarks: * orbital elements for (7778) Markrobinson : Mean anomaly = 17.91537104 deg Arg. of pericenter = 97.23347088 deg Long. of node = 224.63830499 deg Inclination = 19.56477168 deg Eccentricity = 0.32700201 Semimajor axis = 2.38405018 AU Perihelion dist = 1.60446097 AU Mag: H = 13.00, G = 0.15 Epoch of elements : MJD 56151.06900000 TDT (2012 Aug 12.069) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 12 7778 Markrobinson 1h 39.3m UT 9.3 1 46 37.855 33 19 31.31TYC 2298-01142-1 9.5 15.4 11 1.0 1.155 3.365 10.92 40.9075 33.322 156.43 14.89 1.6555 0.08613 -0.34006 5.54122 1.43625 -0.00403 -0.00203 2000 17.6291452012 811.00000 97.233471224.638305 19.5647720.32700201 2.3840502 1.604461012.5 5.00.15 RATE 2.6775100 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.102 0.055 105 6.16 0.068 0 0 0 4 056099.0020120812_1142-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 00:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org