IOTA/IOTA-ES occultation update for (2397) Lappajarvi / TYC 0787-00667-1 event on 2008 Jan 04, 05:35 UT Visible from Brazil, Peru, Ecuador Summary ------- On 2008 Jan 04 UT, the 22 km diameter asteroid (2397) Lappajarvi will occult a 10.4 mag star in the constellation Canis Minor for observers along a path across Brazil, Peru, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 14.5 mag (the magnitude of the asteroid) for at most 2.2 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: 20 * date and approx. time of event: 2008 Jan 04, 05:24 - 2008 Jan 04, 05:44 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 2.2 * Moon: 16 % sunlit, 117° distance * Sun: 163° distance * rough path description: Brazil, Peru, Ecuador The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 3.41 * 1 sigma uncertainty interval [seconds]: +/- 10.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .091 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .091", .060", 92° ) * approx speed of asteroid's shadow [km/s]: 10.0874 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0787-00667-1 by 2397 Lappajarvi on 2008 Jan 04 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 -162 0 0 5 37 28 5 44 43 1 78 -14 5 43 51 5 31 4 .. .. .. 4 47 19 -161 0 0 5 49 13 5 44 43 2 79 -15 5 55 36 5 42 49 .. .. .. 4 59 8 -160 0 0 6 0 29 5 44 42 3 79 -16 6 6 52 5 54 7 .. .. .. 5 10 30 -159 0 0 6 11 18 5 44 41 4 79 -17 6 17 40 6 4 56 .. .. .. 5 21 23 -158 0 0 6 21 39 5 44 41 5 79 -18 6 28 0 6 15 17 7 11 15 5 31 48 -157 0 0 6 31 31 5 44 39 6 79 -19 6 37 52 6 25 10 7 21 4 5 41 44 -156 0 0 6 40 55 5 44 38 7 79 -20 6 47 16 6 34 35 7 30 24 5 51 12 -155 0 0 6 49 51 5 44 37 8 79 -21 6 56 11 6 43 31 7 39 17 6 0 12 -154 0 0 6 58 20 5 44 35 9 79 -22 7 4 39 6 52 0 7 47 41 6 8 44 -153 0 0 7 6 20 5 44 33 10 79 -23 7 12 39 7 0 0 7 55 38 6 16 48 -152 0 0 7 13 52 5 44 31 11 80 -24 7 20 10 7 7 33 8 3 7 6 24 23 -151 0 0 7 20 56 5 44 29 12 80 -25 7 27 14 7 14 37 8 10 8 6 31 30 -150 0 0 7 27 32 5 44 26 13 80 -26 7 33 50 7 21 14 8 16 41 6 38 9 -149 0 0 7 33 40 5 44 24 14 80 -27 7 39 57 7 27 22 8 22 46 6 44 20 -148 0 0 7 39 20 5 44 21 15 80 -28 7 45 37 7 33 3 8 28 24 6 50 2 -147 0 0 7 44 32 5 44 18 16 80 -29 7 50 49 7 38 15 8 33 34 6 55 17 -146 0 0 7 49 17 5 44 15 17 80 -30 7 55 34 7 43 0 8 38 17 7 0 4 -145 0 0 7 53 34 5 44 11 18 80 -31 7 59 50 7 47 17 8 42 32 7 4 23 -144 0 0 7 57 23 5 44 8 19 80 -31 8 3 39 7 51 7 8 46 19 7 8 14 -143 0 0 8 0 45 5 44 4 20 80 -32 8 7 1 7 54 29 8 49 39 7 11 37 -142 0 0 8 3 39 5 44 0 21 81 -33 8 9 54 7 57 23 8 52 32 7 14 32 -141 0 0 8 6 5 5 43 56 22 81 -34 8 12 21 7 59 49 8 54 57 7 17 0 -140 0 0 8 8 4 5 43 52 23 81 -35 8 14 20 8 1 48 8 56 55 7 19 0 -139 0 0 8 9 36 5 43 47 24 81 -36 8 15 51 8 3 20 8 58 25 7 20 32 -138 0 0 8 10 40 5 43 43 25 81 -37 8 16 55 8 4 24 8 59 29 7 21 37 -137 0 0 8 11 16 5 43 38 25 81 -38 8 17 32 8 5 1 9 0 5 7 22 14 -136 0 0 8 11 26 5 43 33 26 81 -39 8 17 41 8 5 10 9 0 14 7 22 24 -135 0 0 8 11 8 5 43 28 27 81 -40 8 17 23 8 4 53 8 59 57 7 22 7 -134 0 0 8 10 23 5 43 23 28 81 -41 8 16 39 8 4 8 8 59 12 7 21 22 -133 0 0 8 9 11 5 43 17 29 81 -41 8 15 27 8 2 56 8 58 0 7 20 10 -132 0 0 8 7 32 5 43 12 30 81 -42 8 13 48 8 1 17 8 56 21 7 18 30 -131 0 0 8 5 27 5 43 6 31 81 -43 8 11 42 7 59 11 8 54 16 7 16 24 -130 0 0 8 2 54 5 43 0 32 81 -44 8 9 9 7 56 38 8 51 44 7 13 50 -129 0 0 7 59 54 5 42 54 33 81 -45 8 6 9 7 53 38 8 48 45 7 10 50 -128 0 0 7 56 27 5 42 48 34 81 -46 8 2 43 7 50 12 8 45 20 7 7 22 -127 0 0 7 52 34 5 42 42 35 81 -47 7 58 50 7 46 18 8 41 28 7 3 28 -126 0 0 7 48 14 5 42 35 36 81 -47 7 54 30 7 41 58 8 37 9 6 59 6 -125 0 0 7 43 28 5 42 29 37 81 -48 7 49 44 7 37 11 8 32 24 6 54 18 -124 0 0 7 38 15 5 42 22 38 81 -49 7 44 31 7 31 58 8 27 13 6 49 4 -123 0 0 7 32 35 5 42 15 39 81 -50 7 38 52 7 26 18 8 21 35 6 43 22 -122 0 0 7 26 29 5 42 8 40 81 -51 7 32 46 7 20 12 8 15 31 6 37 14 -121 0 0 7 19 57 5 42 1 41 81 -52 7 26 14 7 13 40 8 9 1 6 30 40 -120 0 0 7 12 59 5 41 53 42 81 -52 7 19 16 7 6 41 8 2 5 6 23 39 -119 0 0 7 5 34 5 41 46 42 81 -53 7 11 52 6 59 16 7 54 43 6 16 12 -118 0 0 6 57 44 5 41 38 43 81 -54 7 4 2 6 51 25 7 46 55 6 8 19 -117 0 0 6 49 27 5 41 30 44 80 -55 6 55 45 6 43 8 7 38 41 5 59 59 -116 0 0 6 40 44 5 41 22 45 80 -55 6 47 3 6 34 25 7 30 1 5 51 14 -115 0 0 6 31 36 5 41 14 46 80 -56 6 37 55 6 25 16 7 20 56 5 42 2 -114 0 0 6 22 2 5 41 6 47 80 -57 6 28 22 6 15 42 7 11 25 5 32 25 -113 0 0 6 12 2 5 40 58 48 80 -58 6 18 22 6 5 42 7 1 29 5 22 22 -112 0 0 6 1 37 5 40 49 49 79 -58 6 7 57 5 55 16 6 51 7 5 11 53 -111 0 0 5 50 46 5 40 41 50 79 -59 5 57 7 5 44 25 6 40 20 5 0 59 -110 0 0 5 39 30 5 40 32 51 79 -60 5 45 51 5 33 8 6 29 7 4 49 39 -109 0 0 5 27 48 5 40 23 52 78 -60 5 34 10 5 21 26 6 17 30 4 37 53 -108 0 0 5 15 42 5 40 14 53 78 -61 5 22 5 5 9 19 6 5 27 4 25 43 -107 0 0 5 3 11 5 40 5 53 77 -61 5 9 34 4 56 47 5 53 0 4 13 7 -106 0 0 4 50 14 5 39 56 54 77 -62 4 56 38 4 43 51 5 40 8 4 0 7 -105 0 0 4 36 53 5 39 47 55 76 -63 4 43 17 4 30 29 5 26 51 3 46 42 -104 0 0 4 23 8 5 39 38 56 76 -63 4 29 32 4 16 43 5 13 10 3 32 51 -103 0 0 4 8 58 5 39 28 57 75 -64 4 15 23 4 2 32 4 59 4 3 18 37 -102 0 0 3 54 23 5 39 18 58 74 -64 4 0 49 3 47 57 4 44 35 3 3 58 -101 0 0 3 39 25 5 39 9 59 74 -65 3 45 51 3 32 58 4 29 41 2 48 54 -100 0 0 3 24 2 5 38 59 59 73 -65 3 30 29 3 17 35 4 14 23 2 33 27 - 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1 0 0 -36 3 38 5 24 52 12 294 5 -35 56 58 -36 10 19 -35 11 36 -36 55 57 0 0 0 -36 21 14 5 24 50 11 293 6 -36 14 35 -36 27 54 -35 29 18 -37 13 27 1 0 0 -36 38 29 5 24 48 10 293 7 -36 31 51 -36 45 8 -35 46 39 -37 30 35 2 0 0 -36 55 23 5 24 47 9 292 7 -36 48 45 -37 2 1 -36 3 39 -37 47 22 3 0 0 -37 11 54 5 24 45 9 292 8 -37 5 17 -37 18 32 -36 20 17 -38 3 48 4 0 0 -37 28 5 5 24 44 8 291 9 -37 21 29 -37 34 41 -36 36 33 -38 19 52 5 0 0 -37 43 53 5 24 43 7 290 10 -37 37 18 -37 50 29 -36 52 28 -38 35 34 6 0 0 -37 59 20 5 24 42 6 290 11 -37 52 45 -38 5 55 -37 8 1 -38 50 55 7 0 0 -38 14 25 5 24 41 5 289 12 -38 7 51 -38 20 59 -37 23 12 -39 5 53 8 0 0 -38 29 8 5 24 40 4 289 12 -38 22 35 -38 35 42 -37 38 1 -39 20 30 9 0 0 -38 43 30 5 24 39 4 288 13 -38 36 57 -38 50 2 -37 52 29 -39 34 46 10 0 0 -38 57 29 5 24 39 3 287 14 -38 50 58 -39 4 1 .. .. .. -39 48 39 11 0 0 -39 11 7 5 24 38 2 287 15 -39 4 36 -39 17 38 .. .. .. -40 2 11 12 0 0 -39 24 23 5 24 38 1 286 16 -39 17 53 -39 30 53 .. .. .. -40 15 20 13 0 0 -39 37 16 5 24 38 0 285 16 -39 30 47 -39 43 46 .. .. .. -40 28 8 Data for the target star ------------------------ * name: TYC 0787-00667-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 50 08.1511 DE: +11 36 41.982 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .019 ) * V mag [mag]: 10.4 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2397) Lappajarvi approx. diameter [km]: 22 approx. diameter ["]: .019 distance from Earth [AU]: 1.61900 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 697 number of rejected observations: 19 time covered by the observations: 1938 Feb 22 - 2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.088, 0.057, 92° remarks: * orbital elements for (2397) Lappajarvi : Mean anomaly = 19.01534888 deg Arg. of pericenter = 298.12781021 deg Long. of node = 145.89037481 deg Inclination = 10.30446136 deg Eccentricity = 0.17941398 Semimajor axis = 3.08476970 AU Perihelion dist = 2.53131888 AU Mag: H = 11.00, G = 0.15 Epoch of elements : MJD 54469.23300000 TDT (2008 Jan 04.233) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 04 2397 Lappajarvi 5h 34.7m UT 10.4 7 50 8.151 11 36 41.98TYC 0787-00667-1 10.8 14.5 22 2.2 1.619 -1.938 12.10 -69.346 11.608 97.49 -22.78 5.5777 -.11719 -.27682 -5.24022 2.22646 -0.00127 0.00118 2000 17.335722220071226.00000298.127810145.890375 10.3044610.179413983.084769702.5313188810.95 0.15 RATE 1.8191561 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.091 0.060 91.9 4.410 0.064 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 22:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org