IOTA/IOTA-ES occultation update for (53) Kalypso / TYC 1249-00646-1 event on 2009 Aug 06, 21:27 UT Visible from Summary ------- On 2009 Aug 06 UT, the 115 km diameter asteroid (53) Kalypso will occult a 11.2 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 13.6 mag (the magnitude of the asteroid) for at most 4.1 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: 98 * date and approx. time of event: 2009 Aug 06, 21:23 - 2009 Aug 06, 21:26 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 4.1 * Moon: 99 % sunlit, 96° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 118 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .023", 85° ) * approx speed of asteroid's shadow [km/s]: 28.3272 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1249-00646-1 by 53 Kalypso on 2009 Aug 6 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 53 0 0 5 17 19 21 23 49 1 74 -65 4 44 6 5 50 36 4 20 54 6 13 57 54 0 0 5 34 32 21 23 49 2 74 -64 5 1 17 6 7 51 4 38 4 6 31 13 55 0 0 5 51 53 21 23 50 3 75 -63 5 18 38 6 25 13 4 55 23 6 48 36 56 0 0 6 9 23 21 23 50 4 75 -63 5 36 6 6 42 45 5 12 51 7 6 8 57 0 0 6 27 1 21 23 50 5 75 -62 5 53 43 7 0 24 5 30 27 7 23 49 58 0 0 6 44 47 21 23 51 6 75 -61 6 11 27 7 18 11 5 48 10 7 41 36 59 0 0 7 2 40 21 23 51 7 75 -60 6 29 19 7 36 5 6 6 1 7 59 31 60 0 0 7 20 39 21 23 52 8 75 -59 6 47 18 7 54 6 6 23 59 8 17 33 61 0 0 7 38 46 21 23 52 9 75 -59 7 5 23 8 12 13 6 42 3 8 35 41 62 0 0 7 56 58 21 23 53 10 75 -58 7 23 34 8 30 27 7 0 14 8 53 56 63 0 0 8 15 17 21 23 54 11 76 -57 7 41 52 8 48 46 7 18 31 9 12 16 64 0 0 8 33 40 21 23 55 12 76 -56 8 0 14 9 7 11 7 36 53 9 30 41 65 0 0 8 52 9 21 23 56 13 76 -55 8 18 42 9 25 40 7 55 20 9 49 11 66 0 0 9 10 42 21 23 57 14 76 -54 8 37 14 9 44 14 8 13 52 10 7 45 67 0 0 9 29 19 21 23 58 15 76 -53 8 55 51 10 2 52 8 32 28 10 26 24 68 0 0 9 48 0 21 23 59 17 76 -52 9 14 31 10 21 34 8 51 7 10 45 6 69 0 0 10 6 44 21 24 0 18 77 -51 9 33 15 10 40 18 9 9 50 11 3 51 70 0 0 10 25 31 21 24 1 19 77 -50 9 52 1 10 59 6 9 28 37 11 22 39 71 0 0 10 44 21 21 24 3 20 77 -49 10 10 50 11 17 56 9 47 25 11 41 30 72 0 0 11 3 12 21 24 4 21 77 -48 10 29 41 11 36 48 10 6 16 12 0 22 73 0 0 11 22 6 21 24 6 22 77 -47 10 48 34 11 55 42 10 25 8 12 19 16 74 0 0 11 41 0 21 24 7 23 78 -47 11 7 28 12 14 36 10 44 2 12 38 11 75 0 0 11 59 55 21 24 9 24 78 -46 11 26 23 12 33 32 11 2 57 12 57 6 76 0 0 12 18 50 21 24 11 25 78 -45 11 45 18 12 52 27 11 21 52 13 16 2 77 0 0 12 37 46 21 24 12 26 78 -44 12 4 13 13 11 23 11 40 47 13 34 58 78 0 0 12 56 40 21 24 14 27 79 -43 12 23 8 13 30 17 11 59 42 13 53 52 79 0 0 13 15 34 21 24 16 28 79 -42 12 42 1 13 49 11 12 18 35 14 12 46 80 0 0 13 34 26 21 24 18 29 79 -41 13 0 54 14 8 4 12 37 28 14 31 38 81 0 0 13 53 17 21 24 20 30 80 -40 13 19 45 14 26 54 12 56 19 14 50 29 82 0 0 14 12 5 21 24 22 31 80 -39 13 38 33 14 45 42 13 15 7 15 9 17 83 0 0 14 30 51 21 24 24 32 80 -38 13 57 19 15 4 27 13 33 53 15 28 2 84 0 0 14 49 34 21 24 27 33 81 -37 14 16 2 15 23 10 13 52 37 15 46 44 85 0 0 15 8 13 21 24 29 34 81 -36 14 34 42 15 41 48 14 11 16 16 5 22 86 0 0 15 26 48 21 24 31 35 81 -35 14 53 17 16 0 23 14 29 52 16 23 57 87 0 0 15 45 19 21 24 34 36 82 -34 15 11 49 16 18 53 14 48 24 16 42 27 88 0 0 16 3 45 21 24 36 37 82 -33 15 30 15 16 37 19 15 6 51 17 0 52 89 0 0 16 22 6 21 24 39 38 83 -32 15 48 37 16 55 39 15 25 14 17 19 12 90 0 0 16 40 22 21 24 41 39 83 -31 16 6 54 17 13 54 15 43 30 17 37 26 91 0 0 16 58 31 21 24 44 40 83 -30 16 25 4 17 32 3 16 1 41 17 55 34 92 0 0 17 16 35 21 24 46 41 84 -29 16 43 8 17 50 6 16 19 46 18 13 36 93 0 0 17 34 32 21 24 49 42 84 -28 17 1 6 18 8 2 16 37 45 18 31 32 94 0 0 17 52 22 21 24 52 43 85 -27 17 18 57 18 25 51 16 55 36 18 49 20 95 0 0 18 10 4 21 24 55 44 85 -26 17 36 40 18 43 32 17 13 20 19 7 0 96 0 0 18 27 39 21 24 57 45 86 -25 17 54 16 19 1 6 17 30 57 19 24 33 97 0 0 18 45 5 21 25 0 46 86 -24 18 11 44 19 18 31 17 48 25 19 41 58 98 0 0 19 2 23 21 25 3 47 87 -23 18 29 3 19 35 48 18 5 46 19 59 14 99 0 0 19 19 33 21 25 6 48 88 -22 18 46 14 19 52 56 18 22 57 20 16 21 100 0 0 19 36 33 21 25 9 49 88 -21 19 3 15 20 9 55 18 40 0 20 33 20 101 0 0 19 53 24 21 25 12 50 89 -20 19 20 8 20 26 45 18 56 53 20 50 8 102 0 0 20 10 5 21 25 15 51 89 -19 19 36 50 20 43 25 19 13 36 21 6 47 103 0 0 20 26 36 21 25 18 52 90 -18 19 53 23 20 59 54 19 30 10 21 23 16 104 0 0 20 42 57 21 25 21 53 91 -17 20 9 45 21 16 14 19 46 33 21 39 34 105 0 0 20 59 7 21 25 25 54 92 -16 20 25 56 21 32 22 20 2 45 21 55 41 106 0 0 21 15 6 21 25 28 54 92 -15 20 41 57 21 48 20 20 18 47 22 11 38 107 0 0 21 30 54 21 25 31 55 93 -14 20 57 47 22 4 6 20 34 38 22 27 23 108 0 0 21 46 31 21 25 34 56 94 -13 21 13 25 22 19 41 20 50 17 22 42 57 109 0 0 22 1 55 21 25 38 57 95 -12 21 28 51 22 35 4 21 5 44 22 58 19 110 0 0 22 17 8 21 25 41 58 96 -11 21 44 5 22 50 15 21 21 0 23 13 28 111 0 0 22 32 8 21 25 44 59 97 -10 21 59 7 23 5 14 21 36 3 23 28 26 112 0 0 22 46 56 21 25 48 60 98 -9 22 13 57 23 20 0 21 50 54 23 43 11 113 0 0 23 1 31 21 25 51 61 99 -9 22 28 34 23 34 33 22 5 32 23 57 43 114 0 0 23 15 54 21 25 54 62 100 -8 22 42 58 23 48 54 22 19 57 24 12 2 115 0 0 23 30 3 21 25 58 63 101 -7 22 57 9 24 3 1 22 34 9 24 26 8 116 0 0 23 43 58 21 26 1 63 102 -6 23 11 6 24 16 55 22 48 8 24 40 1 117 0 0 23 57 40 21 26 5 64 104 -5 23 24 50 24 30 35 23 1 53 24 53 40 118 0 0 24 11 9 21 26 8 65 105 -4 23 38 20 24 44 2 23 15 24 25 7 5 119 0 0 24 24 23 21 26 12 66 106 -3 23 51 36 24 57 14 23 28 42 25 20 17 120 0 0 24 37 23 21 26 15 67 108 -2 24 4 38 25 10 13 23 41 45 25 33 14 121 0 0 24 50 9 21 26 19 68 110 -1 24 17 26 25 22 57 23 54 34 25 45 57 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1249-00646-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 59 19.8060 DE: +15 40 37.538 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 11.2 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (53) Kalypso approx. diameter [km]: 115 approx. diameter ["]: .067 distance from Earth [AU]: 2.35400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 877 number of rejected observations: 122 time covered by the observations: 1900 Jan 25 - 2007 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.011, 78° remarks: * orbital elements for (53) Kalypso : Mean anomaly = 317.72363391 deg Arg. of pericenter = 313.49313237 deg Long. of node = 143.59066741 deg Inclination = 5.16894739 deg Eccentricity = 0.20492389 Semimajor axis = 2.61730943 AU Perihelion dist = 2.08096020 AU Mag: H = 8.73, G = 0.15 Epoch of elements : MJD 55049.89400000 TDT (2009 Aug 06.894) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 6 53 Kalypso 21h 27.5m UT 11.2 3 59 19.806 15 40 37.54TYC 1249-00646-1 12.3 13.6 115 4.1 2.354 4.104 7.51 142.4130 15.675 -140.41 16.47 21.4582 -0.02575 0.21327 15.86184 2.00991 -0.00496 -0.00115 2000 315.4206372009 728.00000313.493132143.590667 5.1689470.20492389 2.6173094 2.0809602 8.8 5.00.15 RATE 2.3276700 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.023 85 1.35 0.023 0 54545.5020090806_0646-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org