IOTA/IOTA-ES occultation update for (124) Alkeste / TYC 6272-00151-1 event on 2008 Mar 25, 05:19 UT Visible from Uruguay, Argentina, Chile Summary ------- On 2008 Mar 25 UT, the 76 km diameter asteroid (124) Alkeste will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across Uruguay, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.8 mag (the magnitude of the asteroid) for at most 4.4 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: 89 * date and approx. time of event: 2008 Mar 25, 05:14 - 2008 Mar 25, 05:20 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 4.4 * Moon: 89 % sunlit, 49° distance * Sun: 92° distance * rough path description: Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.54 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .026", 90° ) * approx speed of asteroid's shadow [km/s]: 17.4078 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6272-00151-1 by 124 Alkeste on 2008 Mar 25 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 - 88 0 0 -23 43 56 5 14 23 0 112 -66 -24 7 37 -23 20 19 -24 33 15 -22 54 53 - 87 0 0 -24 6 46 5 14 23 1 112 -66 -24 30 26 -23 43 9 -24 56 4 -23 17 44 - 86 0 0 -24 29 28 5 14 23 2 112 -66 -24 53 7 -24 5 52 -25 18 44 -23 40 27 - 85 0 0 -24 52 1 5 14 23 3 111 -66 -25 15 39 -24 28 26 -25 41 16 -24 3 2 - 84 0 0 -25 14 25 5 14 24 4 111 -66 -25 38 3 -24 50 51 -26 3 38 -24 25 28 - 83 0 0 -25 36 40 5 14 24 5 110 -66 -26 0 17 -25 13 7 -26 25 51 -24 47 45 - 82 0 0 -25 58 45 5 14 25 6 110 -66 -26 22 21 -25 35 13 -26 47 54 -25 9 52 - 81 0 0 -26 20 39 5 14 26 7 109 -65 -26 44 14 -25 57 8 -27 9 46 -25 31 48 - 80 0 0 -26 42 23 5 14 27 8 109 -65 -27 5 56 -26 18 53 -27 31 27 -25 53 34 - 79 0 0 -27 3 55 5 14 28 9 108 -65 -27 27 27 -26 40 26 -27 52 57 -26 15 9 - 78 0 0 -27 25 16 5 14 29 10 108 -65 -27 48 47 -27 1 48 -28 14 15 -26 36 32 - 77 0 0 -27 46 24 5 14 30 11 108 -64 -28 9 54 -27 22 58 -28 35 20 -26 57 43 - 76 0 0 -28 7 20 5 14 31 12 107 -64 -28 30 48 -27 43 55 -28 56 13 -27 18 42 - 75 0 0 -28 28 3 5 14 33 13 107 -63 -28 51 30 -28 4 40 -29 16 53 -27 39 28 - 74 0 0 -28 48 33 5 14 34 14 106 -63 -29 11 58 -28 25 11 -29 37 20 -28 0 1 - 73 0 0 -29 8 49 5 14 36 15 106 -63 -29 32 13 -28 45 29 -29 57 33 -28 20 20 - 72 0 0 -29 28 51 5 14 37 16 105 -62 -29 52 13 -29 5 32 -30 17 31 -28 40 26 - 71 0 0 -29 48 39 5 14 39 17 105 -62 -30 11 59 -29 25 22 -30 37 15 -29 0 17 - 70 0 0 -30 8 12 5 14 41 18 104 -61 -30 31 30 -29 44 57 -30 56 45 -29 19 54 - 69 0 0 -30 27 30 5 14 43 19 103 -61 -30 50 47 -30 4 16 -31 15 59 -29 39 15 - 68 0 0 -30 46 33 5 14 45 19 103 -60 -31 9 48 -30 23 21 -31 34 58 -29 58 22 - 67 0 0 -31 5 20 5 14 47 20 102 -59 -31 28 33 -30 42 10 -31 53 42 -30 17 13 - 66 0 0 -31 23 51 5 14 49 21 102 -59 -31 47 2 -31 0 43 -32 12 9 -30 35 48 - 65 0 0 -31 42 6 5 14 52 22 101 -58 -32 5 16 -31 19 0 -32 30 20 -30 54 7 - 64 0 0 -32 0 5 5 14 54 23 101 -58 -32 23 13 -31 37 1 -32 48 15 -31 12 10 - 63 0 0 -32 17 48 5 14 57 24 100 -57 -32 40 53 -31 54 46 -33 5 53 -31 29 56 - 62 0 0 -32 35 13 5 14 59 25 99 -56 -32 58 17 -32 12 13 -33 23 15 -31 47 26 - 61 0 0 -32 52 22 5 15 2 26 99 -56 -33 15 23 -32 29 24 -33 40 19 -32 4 39 - 60 0 0 -33 9 13 5 15 4 27 98 -55 -33 32 12 -32 46 17 -33 57 6 -32 21 34 - 59 0 0 -33 25 47 5 15 7 28 98 -54 -33 48 44 -33 2 53 -34 13 36 -32 38 13 - 58 0 0 -33 42 3 5 15 10 28 97 -54 -34 4 58 -33 19 11 -34 29 47 -32 54 33 - 57 0 0 -33 58 2 5 15 13 29 96 -53 -34 20 55 -33 35 12 -34 45 42 -33 10 36 - 56 0 0 -34 13 43 5 15 16 30 96 -52 -34 36 34 -33 50 55 -35 1 18 -33 26 21 - 55 0 0 -34 29 5 5 15 19 31 95 -51 -34 51 54 -34 6 19 -35 16 36 -33 41 48 - 54 0 0 -34 44 10 5 15 22 32 94 -51 -35 6 56 -34 21 26 -35 31 36 -33 56 57 - 53 0 0 -34 58 56 5 15 25 33 94 -50 -35 21 41 -34 36 14 -35 46 18 -34 11 47 - 52 0 0 -35 13 24 5 15 28 34 93 -49 -35 36 6 -34 50 44 -36 0 41 -34 26 19 - 51 0 0 -35 27 33 5 15 31 34 92 -49 -35 50 13 -35 4 55 -36 14 46 -34 40 33 - 50 0 0 -35 41 23 5 15 35 35 91 -48 -36 4 2 -35 18 48 -36 28 33 -34 54 28 - 49 0 0 -35 54 55 5 15 38 36 91 -47 -36 17 32 -35 32 22 -36 42 0 -35 8 4 - 48 0 0 -36 8 8 5 15 42 37 90 -46 -36 30 43 -35 45 37 -36 55 9 -35 21 21 - 47 0 0 -36 21 2 5 15 45 38 89 -46 -36 43 35 -35 58 33 -37 7 59 -35 34 19 - 46 0 0 -36 33 38 5 15 49 38 88 -45 -36 56 8 -36 11 10 -37 20 30 -35 46 59 - 45 0 0 -36 45 54 5 15 52 39 88 -44 -37 8 22 -36 23 29 -37 32 42 -35 59 19 - 44 0 0 -36 57 51 5 15 56 40 87 -43 -37 20 17 -36 35 28 -37 44 35 -36 11 20 - 43 0 0 -37 9 29 5 15 59 41 86 -43 -37 31 53 -36 47 8 -37 56 9 -36 23 2 - 42 0 0 -37 20 48 5 16 3 42 85 -42 -37 43 10 -36 58 28 -38 7 23 -36 34 25 - 41 0 0 -37 31 47 5 16 7 42 84 -41 -37 54 8 -37 9 30 -38 18 19 -36 45 29 - 40 0 0 -37 42 28 5 16 11 43 83 -40 -38 4 46 -37 20 12 -38 28 56 -36 56 13 - 39 0 0 -37 52 49 5 16 15 44 83 -40 -38 15 6 -37 30 35 -38 39 13 -37 6 38 - 38 0 0 -38 2 51 5 16 18 45 82 -39 -38 25 6 -37 40 39 -38 49 11 -37 16 44 - 37 0 0 -38 12 33 5 16 22 46 81 -38 -38 34 47 -37 50 23 -38 58 50 -37 26 30 - 36 0 0 -38 21 57 5 16 26 46 80 -37 -38 44 8 -37 59 48 -39 8 10 -37 35 56 - 35 0 0 -38 31 1 5 16 30 47 79 -37 -38 53 10 -38 8 54 -39 17 10 -37 45 4 - 34 0 0 -38 39 45 5 16 34 48 78 -36 -39 1 53 -38 17 40 -39 25 51 -37 53 52 - 33 0 0 -38 48 10 5 16 38 49 77 -35 -39 10 17 -38 26 7 -39 34 13 -38 2 20 - 32 0 0 -38 56 16 5 16 43 49 76 -34 -39 18 21 -38 34 14 -39 42 16 -38 10 29 - 31 0 0 -39 4 3 5 16 47 50 75 -34 -39 26 6 -38 42 2 -39 49 59 -38 18 19 - 30 0 0 -39 11 30 5 16 51 51 74 -33 -39 33 32 -38 49 30 -39 57 23 -38 25 49 - 29 0 0 -39 18 37 5 16 55 51 73 -32 -39 40 38 -38 56 39 -40 4 28 -38 32 59 - 28 0 0 -39 25 26 5 16 59 52 72 -31 -39 47 25 -39 3 29 -40 11 13 -38 39 50 - 27 0 0 -39 31 55 5 17 4 53 71 -31 -39 53 53 -39 9 59 -40 17 40 -38 46 22 - 26 0 0 -39 38 4 5 17 8 54 69 -30 -40 0 1 -39 16 10 -40 23 47 -38 52 34 - 25 0 0 -39 43 55 5 17 12 54 68 -29 -40 5 50 -39 22 2 -40 29 35 -38 58 27 - 24 0 0 -39 49 25 5 17 16 55 67 -28 -40 11 20 -39 27 34 -40 35 3 -39 4 0 - 23 0 0 -39 54 37 5 17 21 56 66 -28 -40 16 31 -39 32 46 -40 40 13 -39 9 14 - 22 0 0 -39 59 29 5 17 25 56 65 -27 -40 21 22 -39 37 40 -40 45 3 -39 14 8 - 21 0 0 -40 4 2 5 17 30 57 63 -26 -40 25 54 -39 42 13 -40 49 34 -39 18 43 - 20 0 0 -40 8 16 5 17 34 58 62 -25 -40 30 7 -39 46 28 -40 53 45 -39 22 58 - 19 0 0 -40 12 10 5 17 39 58 61 -25 -40 34 0 -39 50 23 -40 57 38 -39 26 54 - 18 0 0 -40 15 45 5 17 43 59 59 -24 -40 37 34 -39 53 59 -41 1 11 -39 30 31 - 17 0 0 -40 19 1 5 17 48 60 58 -23 -40 40 49 -39 57 15 -41 4 26 -39 33 48 - 16 0 0 -40 21 57 5 17 52 60 56 -22 -40 43 45 -40 0 12 -41 7 21 -39 36 46 - 15 0 0 -40 24 34 5 17 57 61 55 -22 -40 46 21 -40 2 50 -41 9 57 -39 39 24 - 14 0 0 -40 26 52 5 18 2 61 53 -21 -40 48 39 -40 5 8 -41 12 13 -39 41 43 - 13 0 0 -40 28 50 5 18 6 62 52 -20 -40 50 37 -40 7 7 -41 14 11 -39 43 42 - 12 0 0 -40 30 30 5 18 11 63 50 -19 -40 52 16 -40 8 46 -41 15 49 -39 45 22 - 11 0 0 -40 31 50 5 18 15 63 48 -19 -40 53 35 -40 10 7 -41 17 9 -39 46 42 - 10 0 0 -40 32 50 5 18 20 64 47 -18 -40 54 36 -40 11 8 -41 18 9 -39 47 44 - 9 0 0 -40 33 32 5 18 25 64 45 -17 -40 55 17 -40 11 49 -41 18 50 -39 48 25 - 8 0 0 -40 33 54 5 18 30 65 43 -16 -40 55 39 -40 12 11 -41 19 12 -39 48 48 - 7 0 0 -40 33 57 5 18 34 65 41 -16 -40 55 42 -40 12 14 -41 19 15 -39 48 50 - 6 0 0 -40 33 40 5 18 39 66 39 -15 -40 55 25 -40 11 58 -41 18 58 -39 48 34 - 5 0 0 -40 33 4 5 18 44 66 37 -14 -40 54 50 -40 11 22 -41 18 23 -39 47 58 - 4 0 0 -40 32 9 5 18 49 67 35 -13 -40 53 55 -40 10 26 -41 17 28 -39 47 2 - 3 0 0 -40 30 55 5 18 54 67 33 -12 -40 52 41 -40 9 12 -41 16 14 -39 45 47 - 2 0 0 -40 29 21 5 18 58 68 31 -12 -40 51 7 -40 7 38 -41 14 41 -39 44 13 - 1 0 0 -40 27 28 5 19 3 68 28 -11 -40 49 14 -40 5 44 -41 12 49 -39 42 19 0 0 0 -40 25 15 5 19 8 68 26 -10 -40 47 2 -40 3 31 -41 10 37 -39 40 6 1 0 0 -40 22 44 5 19 13 69 24 -9 -40 44 31 -40 0 59 -41 8 6 -39 37 33 2 0 0 -40 19 53 5 19 18 69 21 -9 -40 41 41 -39 58 7 -41 5 16 -39 34 41 3 0 0 -40 16 42 5 19 23 69 18 -8 -40 38 31 -39 54 56 -41 2 7 -39 31 29 4 0 0 -40 13 12 5 19 28 70 16 -7 -40 35 1 -39 51 25 -40 58 39 -39 27 57 5 0 0 -40 9 23 5 19 33 70 13 -6 -40 31 13 -39 47 35 -40 54 51 -39 24 7 6 0 0 -40 5 14 5 19 38 70 10 -6 -40 27 5 -39 43 26 -40 50 44 -39 19 56 7 0 0 -40 0 46 5 19 43 70 8 -5 -40 22 38 -39 38 57 -40 46 18 -39 15 26 8 0 0 -39 55 58 5 19 48 71 5 -4 -40 17 51 -39 34 8 -40 41 32 -39 10 36 9 0 0 -39 50 51 5 19 53 71 2 -3 -40 12 45 -39 29 0 -40 36 27 -39 5 27 10 0 0 -39 45 24 5 19 58 71 359 -2 -40 7 19 -39 23 32 -40 31 2 -38 59 58 11 0 0 -39 39 38 5 20 3 71 356 -2 -40 1 34 -39 17 45 -40 25 19 -38 54 9 12 0 0 -39 33 32 5 20 8 71 353 -1 -39 55 29 -39 11 38 -40 19 15 -38 48 1 13 0 0 -39 27 7 5 20 13 71 350 0 -39 49 5 -39 5 11 -40 12 53 -38 41 33 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 12.0] Data for the target star ------------------------ * name: TYC 6272-00151-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 03.0781 DE: -20 33 44.164 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .023 ) * V mag [mag]: 11.3 * B mag [mag]: 11.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (124) Alkeste approx. diameter [km]: 76 approx. diameter ["]: .048 distance from Earth [AU]: 2.17200 * orbital information: orbit source: Preston date of fit: 2008 Mar 12 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1056 number of rejected observations: 202 time covered by the observations: 1902 Sep 03 - 2008 Jan 20 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.011, 89° remarks: * orbital elements for (124) Alkeste : Mean anomaly = 357.20031145 deg Arg. of pericenter = 63.24296655 deg Long. of node = 188.17355243 deg Inclination = 2.95051977 deg Eccentricity = 0.07699744 Semimajor axis = 2.63058931 AU Perihelion dist = 2.42804067 AU Mag: H = 8.08, G = 0.19 Epoch of elements : MJD 54550.22200000 TDT (2008 Mar 25.222) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 25 124 Alkeste 5h 20.2m UT 11.3 18 10 3.078-20 33 44.16TYC 6272-00151-1 11.4 12.8 76 4.4 2.172 2.815 4.33 9.4271 -20.564 101.45 1.96 5.3360 0.03652 -0.32180 9.76708 1.06933 -0.00561 -0.00011 2000 357.1490282008 325.00000 63.242967188.173552 2.9505200.07699744 2.6305893 2.4280407 8.1 5.00.19 RATE 2.3100660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.026 90 1.54 0.026 0 54537.5020080325_0151-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 12, 23:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org