IOTA/IOTA-ES occultation update for (2354) Lavrov / TYC 6258-01038-1 event on 2009 May 02, 06:13 UT Visible from Summary ------- On 2009 May 02 UT, the 15 km diameter asteroid (2354) Lavrov will occult a 9.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.4 mag (the magnitude of the asteroid) for at most 4.9 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: 11 * date and approx. time of event: 2009 May 02, 05:49 - 2009 May 02, 06:48 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 4.9 * Moon: 54 % sunlit, 132° distance * Sun: 133° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 6.20 * 1 sigma uncertainty interval [seconds]: +/- 35.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .081 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .081", .054", 91° ) * approx speed of asteroid's shadow [km/s]: 2.9764 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6258-01038-1 by 2354 Lavrov on 2009 May 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 ' " Longitude Longitude Longitude Longitude -124 34 24 42 0 0 6 48 7 0 116 -29 -124 21 41 -124 47 10 -121 47 10 ... .. .. -121 56 44 41 0 0 6 48 5 3 118 -31 -121 44 41 -122 8 50 -119 17 41 ... .. .. Latitude Latitude Latitude Latitude -121 0 0 40 37 28 6 48 3 3 119 -32 40 42 14 40 32 43 41 41 26 39 33 51 -120 0 0 40 13 7 6 48 1 4 119 -32 40 17 53 40 8 20 41 17 20 39 9 14 -119 0 0 39 48 12 6 47 58 5 120 -33 39 53 0 39 43 24 40 52 41 38 44 4 -118 0 0 39 22 43 6 47 55 6 121 -34 39 27 33 39 17 55 40 27 28 38 18 21 -117 0 0 38 56 42 6 47 51 7 121 -34 39 1 33 38 51 52 40 1 42 37 52 5 -116 0 0 38 30 8 6 47 47 8 122 -35 38 35 0 38 25 17 39 35 23 37 25 16 -115 0 0 38 3 2 6 47 42 9 122 -35 38 7 54 37 58 9 39 8 31 36 57 55 -114 0 0 37 35 22 6 47 37 10 123 -36 37 40 16 37 30 29 38 41 6 36 30 2 -113 0 0 37 7 11 6 47 31 11 124 -37 37 12 5 37 2 16 38 13 8 36 1 36 -112 0 0 36 38 27 6 47 24 11 124 -37 36 43 22 36 33 31 37 44 39 35 32 39 -111 0 0 36 9 11 6 47 17 12 125 -38 36 14 8 36 4 15 37 15 37 35 3 10 -110 0 0 35 39 25 6 47 9 13 125 -39 35 44 22 35 34 27 36 46 3 34 33 11 -109 0 0 35 9 7 6 47 1 14 126 -39 35 14 5 35 4 8 36 15 58 34 2 40 -108 0 0 34 38 18 6 46 51 15 127 -40 34 43 17 34 33 19 35 45 22 33 31 40 -107 0 0 34 6 59 6 46 42 16 127 -40 34 12 0 34 1 59 35 14 15 33 0 9 -106 0 0 33 35 11 6 46 31 17 128 -41 33 40 12 33 30 10 34 42 39 32 28 10 -105 0 0 33 2 54 6 46 20 18 128 -42 33 7 55 32 57 52 34 10 32 31 55 41 -104 0 0 32 30 7 6 46 9 19 129 -42 32 35 10 32 25 5 33 37 57 31 22 45 -103 0 0 31 56 54 6 45 56 20 129 -43 32 1 57 31 51 50 33 4 53 30 49 21 -102 0 0 31 23 12 6 45 43 21 130 -43 31 28 17 31 18 8 32 31 22 30 15 31 -101 0 0 30 49 5 6 45 29 22 130 -44 30 54 9 30 44 0 31 57 23 29 41 14 -100 0 0 30 14 31 6 45 15 23 131 -44 30 19 36 30 9 26 31 22 58 29 6 32 - 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12 0 0 -18 54 35 5 58 54 63 265 -16 -18 50 13 -18 58 56 -17 56 4 -19 52 53 - 11 0 0 -19 12 50 5 58 24 62 265 -15 -19 8 29 -19 17 11 -18 14 27 -20 11 0 - 10 0 0 -19 30 36 5 57 55 61 266 -14 -19 26 15 -19 34 56 -18 32 21 -20 28 38 - 9 0 0 -19 47 53 5 57 25 60 266 -13 -19 43 33 -19 52 12 -18 49 46 -20 45 47 - 8 0 0 -20 4 41 5 56 57 59 266 -13 -20 0 22 -20 9 0 -19 6 42 -21 2 28 - 7 0 0 -20 21 1 5 56 28 59 266 -12 -20 16 42 -20 25 19 -19 23 9 -21 18 40 - 6 0 0 -20 36 51 5 56 0 58 267 -11 -20 32 33 -20 41 9 -19 39 7 -21 34 23 - 5 0 0 -20 52 13 5 55 32 57 267 -10 -20 47 55 -20 56 30 -19 54 36 -21 49 38 - 4 0 0 -21 7 6 5 55 4 56 267 -10 -21 2 49 -21 11 23 -20 9 36 -22 4 24 - 3 0 0 -21 21 30 5 54 37 55 267 -9 -21 17 13 -21 25 47 -20 24 7 -22 18 41 - 2 0 0 -21 35 25 5 54 10 55 267 -8 -21 31 9 -21 39 41 -20 38 9 -22 32 30 - 1 0 0 -21 48 52 5 53 43 54 267 -7 -21 44 36 -21 53 7 -20 51 41 -22 45 50 0 0 0 -22 1 49 5 53 17 53 267 -7 -21 57 34 -22 6 4 -21 4 45 -22 58 41 1 0 0 -22 14 17 5 52 51 52 267 -6 -22 10 3 -22 18 32 -21 17 19 -23 11 4 2 0 0 -22 26 17 5 52 25 51 267 -5 -22 22 3 -22 30 31 -21 29 24 -23 22 58 3 0 0 -22 37 48 5 52 0 51 267 -4 -22 33 34 -22 42 1 -21 41 0 -23 34 23 4 0 0 -22 48 49 5 51 35 50 267 -4 -22 44 36 -22 53 3 -21 52 7 -23 45 19 5 0 0 -22 59 22 5 51 11 49 267 -3 -22 55 9 -23 3 35 -22 2 45 -23 55 47 6 0 0 -23 9 25 5 50 46 48 267 -2 -23 5 13 -23 13 38 -22 12 53 -24 5 46 7 0 0 -23 19 0 5 50 22 47 267 -1 -23 14 48 -23 23 12 -22 22 33 -24 15 16 8 0 0 -23 28 6 5 49 59 46 266 -1 -23 23 54 -23 32 18 -22 31 43 -24 24 17 Uncertainty in time = +/- 40 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6258-01038-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 55 52.7382 DE: -19 00 42.471 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 9.8 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2354) Lavrov approx. diameter [km]: 15 approx. diameter ["]: .010 distance from Earth [AU]: 2.03000 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 960 number of rejected observations: 44 time covered by the observations: 1929 Nov 06 - 2008 Mar 14 1 sigma uncertainty ellipse (major, minor, PA): 0.078, 0.050, 91° remarks: * orbital elements for (2354) Lavrov : Mean anomaly = 259.32496645 deg Arg. of pericenter = 189.99858225 deg Long. of node = 176.07554133 deg Inclination = 3.26681018 deg Eccentricity = 0.10643257 Semimajor axis = 2.72936711 AU Perihelion dist = 2.43887356 AU Mag: H = 11.72, G = 0.15 Epoch of elements : MJD 54953.25900000 TDT (2009 May 02.259) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 2 2354 Lavrov 6h 13.3m UT 9.8 17 55 52.738-19 0 42.47TYC 6258-01038-1 10.0 16.4 15 4.9 2.030 -0.434 3.92 -44.6603 -19.013 85.92 15.43 6.2221 0.11725 0.18281 -1.41594 0.90408 -0.00412 -0.00027 2000 258.6126132009 429.00000189.998582176.075541 3.2668100.10643257 2.7293671 2.438873611.8 5.00.15 RATE 2.1858030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.081 0.054 91 7.20 0.063 0 54581.5020090502_1038-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org