IOTA/IOTA-ES occultation update for (733) Mocia / TYC 2915-01886-1 event on 2008 Mar 30, 04:46 UT Visible from E Canada, NE USA Summary ------- On 2008 Mar 30 UT, the 89 km diameter asteroid (733) Mocia will occult a 11.2 mag star in the constellation Auriga for observers along a path across E Canada, NE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 15.2 mag (the magnitude of the asteroid) for at most 3.8 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: 86 * date and approx. time of event: 2008 Mar 30, 04:44 - 2008 Mar 30, 04:48 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 3.8 * Moon: 47 % sunlit, 159° distance * Sun: 78° distance * rough path description: E Canada, NE USA The occultation path -------------------- * approximate projected width [km]: 180 * 1 sigma uncertainty interval [path widths]: +/- 0.58 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .021", 93° ) * approx speed of asteroid's shadow [km/s]: 23.5561 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2915-01886-1 by 733 Mocia on 2008 Mar 30 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 11 16 0 64 33 34 4 44 49 15 3 0 10 43 42 63 4 37 11 50 53 65 54 11 10 9 10 61 6 37 12 34 51 67 19 42 9 47 44 65 46 18 4 44 52 16 2 -1 9 19 0 64 23 48 10 19 6 67 2 7 8 48 46 62 36 54 10 59 2 68 23 28 8 10 53 66 51 46 4 44 55 17 0 -1 7 45 59 65 34 10 8 38 23 68 3 50 7 20 10 63 55 13 9 13 46 69 21 50 6 25 29 67 50 58 4 44 59 18 359 -1 6 4 46 66 37 13 6 48 40 69 0 0 5 43 42 65 4 18 7 18 53 70 15 14 4 31 34 68 44 35 4 45 2 19 357 -2 4 15 29 67 33 58 4 49 55 69 51 7 3 59 34 66 5 49 5 14 14 71 4 1 2 29 11 69 33 4 4 45 6 20 356 -2 2 18 15 68 25 5 2 42 7 70 37 28 2 7 58 67 0 49 2 59 47 71 48 22 0 18 30 70 16 46 4 45 9 20 354 -3 0 13 14 69 11 2 0 25 24 71 19 19 0 9 6 67 50 0 0 35 35 72 28 26 - 2 0 15 70 55 54 4 45 13 21 352 -3 - 1 59 19 69 52 8 - 1 59 59 71 56 47 - 1 56 44 68 33 54 - 1 58 8 73 4 17 - 4 26 40 71 30 37 4 45 16 22 350 -4 - 4 19 0 70 28 37 - 4 33 39 72 29 58 - 4 9 11 69 12 52 - 4 40 55 73 35 57 - 7 0 13 72 1 2 4 45 20 22 348 -4 - 6 45 20 71 0 41 - 7 14 59 72 58 57 - 6 27 48 69 47 10 - 7 32 8 74 3 28 - 9 40 10 72 27 14 4 45 23 23 346 -5 - 9 17 39 71 28 26 - 10 3 12 73 23 45 - 8 51 58 70 16 59 - 10 30 51 74 26 49 - 12 25 38 72 49 17 4 45 26 24 343 -5 - 11 55 10 71 51 59 - 12 57 17 73 44 26 - 11 21 0 70 42 29 - 13 35 53 74 46 2 - 15 15 32 73 7 15 4 45 30 24 341 -6 - 14 36 56 72 11 26 - 15 56 1 74 1 2 - 13 54 4 71 3 48 - 16 45 49 75 1 7 - 18 8 42 73 21 12 4 45 33 25 338 -6 - 17 21 53 72 26 52 - 18 58 3 74 13 35 - 16 30 15 71 21 4 - 19 59 4 75 12 7 - 21 3 47 73 31 14 4 45 37 25 336 -7 - 20 8 52 72 38 22 - 22 1 51 74 22 10 - 19 8 32 71 34 23 - 23 13 51 75 19 5 - 23 59 25 73 37 25 4 45 40 26 334 -7 - 22 56 40 72 46 3 - 25 5 54 74 26 54 - 21 47 51 71 43 52 - 26 28 22 75 22 7 - 26 54 14 73 39 53 4 45 44 26 331 -8 - 25 44 1 72 50 1 - 28 8 36 74 27 52 - 24 27 5 71 49 38 - 29 40 51 75 21 21 - 29 46 51 73 38 46 4 45 47 26 329 -9 - 28 29 43 72 50 26 - 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49 41 16 70 41 3 - 53 20 26 71 50 6 - 47 40 21 69 57 24 - 55 34 10 72 26 43 - 53 17 53 70 49 25 4 46 22 29 310 -14 - 51 29 42 70 15 7 - 55 9 14 71 21 49 - 49 28 3 69 32 50 - 57 22 31 71 57 5 - 54 59 25 70 20 40 4 46 25 29 309 -15 - 53 11 18 69 47 28 - 56 50 23 70 51 58 - 51 9 21 69 6 28 - 59 2 48 71 25 59 - 56 33 57 69 50 24 4 46 28 29 308 -16 - 54 46 14 69 18 13 - 58 24 14 70 20 41 - 52 44 23 68 38 27 - 60 35 25 70 53 32 - 58 1 46 69 18 44 4 46 32 29 307 -16 - 56 14 43 68 47 32 - 59 51 6 69 48 5 - 54 13 17 68 8 53 - 62 0 47 70 19 51 - 59 23 12 68 45 49 4 46 35 29 306 -17 - 57 37 1 68 15 29 - 61 11 22 69 14 17 - 55 36 17 67 37 53 - 63 19 20 69 45 4 - 60 38 32 68 11 42 4 46 39 29 305 -18 - 58 53 24 67 42 12 - 62 25 23 68 39 22 - 56 53 36 67 5 34 - 64 31 30 69 9 15 - 61 48 7 67 36 31 4 46 42 29 305 -18 - 60 4 10 67 7 46 - 63 33 33 68 3 27 - 58 5 27 66 32 1 - 65 37 42 68 32 30 - 62 52 16 67 0 19 4 46 46 29 304 -19 - 61 9 36 66 32 15 - 64 36 12 67 26 35 - 59 12 5 65 57 19 - 66 38 19 67 54 53 - 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65 55 49 60 2 3 - 72 26 20 61 45 1 - 69 35 36 60 13 43 4 47 20 28 302 -26 - 68 6 22 59 49 11 - 71 4 39 60 36 31 - 66 22 35 59 18 24 - 72 47 44 61 0 55 - 69 57 1 59 29 11 4 47 24 28 302 -27 - 68 28 55 59 4 42 - 71 24 50 59 51 56 - 66 46 20 58 33 58 - 73 6 22 60 16 16 - 70 15 40 58 44 0 4 47 27 27 303 -27 - 68 48 39 58 19 30 - 71 42 19 59 6 44 - 67 7 10 57 48 45 - 73 22 24 59 31 3 - 70 31 41 57 58 7 4 47 30 27 303 -28 - 69 5 39 57 33 34 - 71 57 14 58 20 54 - 67 25 14 57 2 42 - 73 35 57 58 45 15 - 70 45 8 57 11 32 4 47 34 27 303 -29 - 69 20 3 56 46 52 - 72 9 41 57 34 25 - 67 40 35 56 15 51 - 73 47 7 57 58 52 - 70 56 8 56 24 15 4 47 37 27 303 -30 - 69 31 54 55 59 24 - 72 19 44 56 47 16 - 67 53 18 55 28 8 - 73 55 59 57 11 52 - 71 4 46 55 36 13 4 47 41 26 303 -31 - 69 41 18 55 11 8 - 72 27 30 55 59 26 - 68 3 28 54 39 32 - 74 2 39 56 24 15 - 71 11 4 54 47 24 4 47 44 26 304 -31 - 69 48 17 54 22 1 - 72 33 2 55 10 54 - 68 11 8 53 50 0 - 74 7 11 55 35 58 - 71 15 6 53 57 46 4 47 48 25 304 -32 - 69 52 55 53 32 1 - 72 36 23 54 21 35 - 68 16 19 52 59 30 - 74 9 38 54 47 0 - 71 16 54 53 7 17 4 47 51 25 304 -33 - 69 55 13 52 41 5 - 72 37 35 53 31 30 - 68 19 2 52 7 57 - 74 10 2 53 57 18 - 71 16 28 52 15 52 4 47 55 24 305 -34 - 69 55 11 51 49 8 - 72 36 40 52 40 33 - 68 19 18 51 15 17 - 74 8 26 53 6 51 - 71 13 50 51 23 29 4 47 58 24 305 -35 - 69 52 49 50 56 7 - 72 33 38 51 48 43 - 68 17 5 50 21 25 - 74 4 50 52 15 33 - 71 8 58 50 30 1 4 48 2 23 305 -36 - 69 48 5 50 1 55 - 72 28 30 50 55 53 - 68 12 20 49 26 13 - 73 59 15 51 23 23 - 71 1 50 49 35 24 4 48 5 23 306 -37 - 69 40 58 49 6 27 - 72 21 13 50 2 1 - 68 4 59 48 29 35 - 73 51 40 50 30 16 - 70 52 23 48 39 31 4 48 8 22 306 -38 - 69 31 21 48 9 35 - 72 11 46 49 6 59 - 67 54 56 47 31 20 - 73 42 3 49 36 6 - 70 40 31 47 42 14 4 48 12 21 307 -38 - 69 19 8 47 11 8 - 72 0 4 48 10 42 - 67 42 1 46 31 17 - 73 30 20 48 40 48 - 70 26 8 46 43 23 4 48 15 21 307 -39 - 69 4 10 46 10 56 - 71 46 2 47 13 0 - 67 26 2 45 29 11 - 73 16 29 47 44 15 - 70 9 4 45 42 47 4 48 19 20 307 -40 - 68 46 16 45 8 44 - 71 29 31 46 13 45 - 67 6 42 44 24 42 - 73 0 22 46 46 19 - 69 49 6 44 40 10 4 48 22 19 308 -42 - 68 25 8 44 4 14 - 71 10 23 45 12 43 - 66 43 38 43 17 27 - 72 41 53 45 46 50 - 69 25 58 43 35 15 4 48 26 18 308 -43 - 68 0 25 42 57 2 - 70 48 24 44 9 41 - 66 16 18 42 6 52 - 72 20 51 44 45 36 - 68 59 15 42 27 37 4 48 29 17 309 -44 - 67 31 35 41 46 36 - 70 23 16 43 4 18 - 65 43 57 40 52 11 - 71 57 1 43 42 22 - 68 28 28 41 16 44 4 48 33 16 310 -45 - 66 57 54 40 32 13 - 69 54 36 41 56 11 - 65 5 26 39 32 17 - 71 30 7 42 36 49 - 67 52 51 40 1 52 4 48 36 15 310 -46 - 66 18 19 39 12 49 - 69 21 50 40 44 46 - 64 18 55 38 5 22 - 70 59 45 41 28 33 - 67 11 18 38 41 57 4 48 39 14 311 -47 - 65 31 8 37 46 47 - 68 44 12 39 29 19 - 63 21 11 36 28 22 - 70 25 22 40 17 1 - 66 22 5 37 15 19 4 48 43 12 311 -49 - 64 33 25 36 11 19 - 68 0 35 38 8 44 - 62 5 27 34 34 49 - 69 46 12 39 1 29 - 65 22 13 35 39 8 4 48 46 11 312 -50 - 63 19 17 34 20 50 - 67 9 10 36 41 17 - 60 11 12 32 5 11 - 69 1 8 37 40 52 - 64 5 41 33 47 43 4 48 50 9 313 -52 - 61 32 36 32 0 4 - 66 6 51 35 4 3 ... .. .. .. .. .. - 68 8 24 36 13 30 - 62 15 46 31 25 22 4 48 53 6 314 -54 ... .. .. .. .. .. - 64 47 17 33 11 4 ... .. .. .. .. .. - 67 4 58 34 36 33 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 2915-01886-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 47 23.8926 DE: +40 05 41.632 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .016 ) * V mag [mag]: 11.2 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (733) Mocia approx. diameter [km]: 89 approx. diameter ["]: .036 distance from Earth [AU]: 3.37700 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 735 number of rejected observations: 38 time covered by the observations: 1909 Feb 21 - 2008 Mar 26 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.013, 97° remarks: * orbital elements for (733) Mocia : Mean anomaly = 294.64257514 deg Arg. of pericenter = 194.70285429 deg Long. of node = 341.15609985 deg Inclination = 20.26087024 deg Eccentricity = 0.06330831 Semimajor axis = 3.39955408 AU Perihelion dist = 3.18433407 AU Mag: H = 9.06, G = 0.15 Epoch of elements : MJD 54555.19900000 TDT (2008 Mar 30.199) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 30 733 Mocia 4h 46.7m UT 11.2 5 47 23.893 40 5 41.63TYC 2915-01886-1 11.2 15.2 89 3.8 3.377 2.750 -14.25 -172.7766 40.099 109.44 3.91 4.7784 0.35706 0.79202 12.11649 -5.47425 0.00574 0.00048 2000 293.8250692008 325.00000194.702854341.156100 20.2608700.06330831 3.3995541 3.1843341 9.1 5.00.15 RATE 1.5724290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.021 93 1.58 0.021 0 54553.5020080330_1886-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org