IOTA/IOTA-ES occultation update for (13244) 1998 MJ14 / TYC 6886-00754-1 event on 2008 May 12, 04:44 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2008 May 12 UT, the 32 km diameter asteroid (13244) 1998 MJ14 will occult a 10.4 mag star in the constellation Sagittarius for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 16.6 mag (the magnitude of the asteroid) for at most 8.5 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: 9 * date and approx. time of event: 2008 May 12, 04:20 - 2008 May 12, 05:09 UT * midpoint of event [JD]: 2454598.69745833 * magnitude of target star: 10.4 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 8.5 * Moon: 50 % sunlit, 143° distance * Sun: 127° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 7.44 * 1 sigma uncertainty interval [seconds]: +/- 32.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .127 +/- .086) * 1 sigma uncertainty ellipse (major, minor, PA): ( .139", .065", 63° ) * approx speed of asteroid's shadow [km/s]: 3.7161 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6886-00754-1 by 13244 1998 MJ14 on 2008 May 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 ' " Longitude Longitude Longitude Longitude - 98 19 49 18 0 0 5 9 31 2 122 -49 - 98 1 15 - 98 38 32 ... .. .. ... .. .. - 96 43 39 17 0 0 5 9 29 3 122 -50 - 96 25 50 - 97 1 35 ... .. .. ... .. .. - 95 12 27 16 0 0 5 9 24 5 123 -52 - 94 55 17 - 95 29 44 ... .. .. -100 1 2 - 93 45 36 15 0 0 5 9 19 7 123 -53 - 93 28 59 - 94 2 18 - 89 31 26 - 98 23 16 - 92 22 34 14 0 0 5 9 11 8 123 -55 - 92 6 27 - 92 38 46 - 88 15 13 - 96 50 50 - 91 2 57 13 0 0 5 9 3 10 124 -56 - 90 47 16 - 91 18 43 - 87 1 40 - 95 22 59 - 89 46 24 12 0 0 5 8 53 12 124 -58 - 89 31 6 - 90 1 45 - 85 50 32 - 93 59 11 - 88 32 35 11 0 0 5 8 42 13 124 -59 - 88 17 38 - 88 47 36 - 84 41 36 - 92 38 58 - 87 21 17 10 0 0 5 8 30 15 124 -60 - 87 6 38 - 87 35 59 - 83 34 41 - 91 21 57 - 86 12 15 9 0 0 5 8 17 16 124 -62 - 85 57 53 - 86 26 40 - 82 29 37 - 90 7 49 - 85 5 18 8 0 0 5 8 3 17 124 -63 - 84 51 11 - 85 19 27 - 81 26 15 - 88 56 16 - 84 0 15 7 0 0 5 7 48 19 124 -64 - 83 46 22 - 84 14 11 - 80 24 29 - 87 47 6 - 82 56 58 6 0 0 5 7 32 20 124 -65 - 82 43 18 - 83 10 41 - 79 24 10 - 86 40 5 - 81 55 19 5 0 0 5 7 15 22 124 -66 - 81 41 50 - 82 8 51 - 78 25 12 - 85 35 3 - 80 55 10 4 0 0 5 6 58 23 124 -68 - 80 41 51 - 81 8 32 - 77 27 31 - 84 31 51 - 79 56 25 3 0 0 5 6 40 24 124 -69 - 79 43 15 - 80 9 37 - 76 30 59 - 83 30 19 - 78 58 58 2 0 0 5 6 21 25 124 -70 - 78 45 57 - 79 12 2 - 75 35 33 - 82 30 22 - 78 2 44 1 0 0 5 6 1 27 124 -71 - 77 49 50 - 78 15 40 - 74 41 9 - 81 31 51 - 77 7 38 0 0 0 5 5 41 28 124 -72 - 76 54 51 - 77 20 26 - 73 47 42 - 80 34 41 - 76 13 35 - 1 0 0 5 5 20 29 124 -73 - 76 0 54 - 76 26 17 - 72 55 8 - 79 38 47 Latitude Latitude Latitude Latitude - 76 0 0 - 1 15 15 5 5 15 30 124 -73 - 1 1 1 - 1 29 32 2 26 36 - 5 7 18 - 75 0 0 - 2 23 30 5 4 50 31 123 -74 - 2 9 5 - 2 37 57 1 20 55 - 6 18 33 - 74 0 0 - 3 33 7 5 4 24 32 123 -75 - 3 18 31 - 3 47 45 0 13 54 - 7 31 15 - 73 0 0 - 4 44 5 5 3 57 34 123 -76 - 4 29 19 - 4 58 54 - 0 54 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37 30 129 0 0 -75 35 17 4 20 53 18 218 -4 -75 15 11 -75 55 33 -70 31 27 -81 18 51 130 0 0 -75 7 1 4 20 47 18 217 -4 -74 46 30 -75 27 42 -69 57 22 -80 58 51 131 0 0 -74 37 1 4 20 41 17 216 -3 -74 16 4 -74 58 9 -69 21 28 -80 37 21 132 0 0 -74 5 11 4 20 36 17 215 -3 -73 43 48 -74 26 45 -68 43 38 -80 14 14 133 0 0 -73 31 23 4 20 29 16 215 -2 -73 9 33 -73 53 24 -68 3 46 -79 49 20 134 0 0 -72 55 29 4 20 23 15 214 -2 -72 33 12 -73 17 57 -67 21 46 -79 22 30 135 0 0 -72 17 20 4 20 17 15 213 -2 -71 54 37 -72 40 16 -66 37 30 -78 53 32 136 0 0 -71 36 48 4 20 11 14 212 -1 -71 13 38 -72 0 12 -65 50 51 -78 22 15 137 0 0 -70 53 43 4 20 4 13 211 0 -70 30 7 -71 17 34 .. .. .. -77 48 26 Uncertainty in time = +/- 66 secs [Prediction of 2008 Mar 31.0] Data for the target star ------------------------ * name: TYC 6886-00754-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 07 34.4592 DE: -29 28 31.021 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .020 ) * V mag [mag]: 10.4 * B mag [mag]: 10.8 * Apparent position with proper motion RA(deg): 287.0328323250 DE(deg): -29.4624021622 * Equation of equinoxes (radians) : 0.000041235117963 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13244) 1998 MJ14 approx. diameter [km]: 32 approx. diameter ["]: .018 distance from Earth [AU]: 2.42200 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 500 number of rejected observations: 7 time covered by the observations: 1983 Jan 14 - 2007 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.137, 0.062, 62° remarks: * orbital elements for (13244) 1998 MJ14 : Mean anomaly = 330.97676469 deg Arg. of pericenter = 13.63684223 deg Long. of node = 284.99231809 deg Inclination = 19.54357438 deg Eccentricity = 0.01294343 Semimajor axis = 3.16726737 AU Perihelion dist = 3.12627208 AU Mag: H = 11.52, G = 0.15 Epoch of elements : MJD 54598.19800000 TDT (2008 May 12.198) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 12 13244 1998 MJ14 4h 44.3m UT 10.4 19 7 34.459-29 28 31.02TYC 6886-00754-1 10.8 16.6 32 8.5 2.422 -0.378 5.82 -14.5240 -29.477 108.01 18.23 4.7390 -0.36010 -0.30463 -1.35426 1.60164 -0.00455 -0.00012 2000 329.5433072008 5 4.00000 13.636842284.992318 19.5435740.01294343 3.1672674 3.126272111.4 5.00.15 RATE 1.7485460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.139 0.065 63 8.44 0.134 0 54556.5020080512_0754-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org