IOTA/IOTA-ES occultation update for (435) Ella / TYC 6362-00084-1 event on 2009 Jun 06, 07:45 UT Visible from Summary ------- On 2009 Jun 06 UT, the 42 km diameter asteroid (435) Ella will occult a 10.8 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.1 mag (the magnitude of the asteroid) for at most 5.0 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: 74 * date and approx. time of event: 2009 Jun 06, 07:35 - 2009 Jun 06, 07:49 UT * magnitude of target star: 10.8 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 5.0 * Moon: 98 % sunlit, 81° distance * Sun: 114° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 0.76 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .027", 80° ) * approx speed of asteroid's shadow [km/s]: 8.2222 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6362-00084-1 by 435 Ella on 2009 Jun 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 -126 0 0 21 54 43 7 35 26 1 108 -44 21 39 58 22 9 30 .. .. .. 22 32 5 -125 0 0 21 36 56 7 35 26 2 109 -45 21 22 13 21 51 42 .. .. .. 22 14 15 -124 0 0 21 19 30 7 35 27 3 109 -45 21 4 48 21 34 14 20 42 33 21 56 44 -123 0 0 21 2 24 7 35 28 4 109 -46 20 47 43 21 17 7 20 25 31 21 39 34 -122 0 0 20 45 38 7 35 29 5 110 -46 20 30 59 21 0 20 20 8 49 21 22 45 -121 0 0 20 29 14 7 35 31 6 110 -46 20 14 36 20 43 54 19 52 28 21 6 17 -120 0 0 20 13 11 7 35 33 7 111 -47 19 58 35 20 27 50 19 36 29 20 50 11 -119 0 0 19 57 30 7 35 35 8 111 -47 19 42 56 20 12 8 19 20 52 20 34 27 -118 0 0 19 42 12 7 35 37 9 111 -48 19 27 39 19 56 48 19 5 37 20 19 5 -117 0 0 19 27 17 7 35 40 10 112 -48 19 12 45 19 41 51 18 50 45 20 4 6 -116 0 0 19 12 44 7 35 43 11 112 -48 18 58 14 19 27 17 18 36 15 19 49 30 -115 0 0 18 58 35 7 35 46 12 112 -48 18 44 6 19 13 7 18 22 10 19 35 18 -114 0 0 18 44 50 7 35 49 13 113 -49 18 30 22 18 59 21 18 8 28 19 21 30 -113 0 0 18 31 30 7 35 53 14 113 -49 18 17 3 18 45 59 17 55 10 19 8 6 -112 0 0 18 18 33 7 35 57 15 113 -49 18 4 8 18 33 2 17 42 17 18 55 7 -111 0 0 18 6 2 7 36 1 15 114 -49 17 51 38 18 20 30 17 29 49 18 42 33 -110 0 0 17 53 56 7 36 6 16 114 -49 17 39 33 18 8 22 17 17 45 18 30 24 -109 0 0 17 42 16 7 36 11 17 115 -49 17 27 53 17 56 41 17 6 8 18 18 41 -108 0 0 17 31 1 7 36 16 18 115 -49 17 16 40 17 45 25 16 54 56 18 7 24 -107 0 0 17 20 13 7 36 21 19 115 -49 17 5 52 17 34 36 16 44 10 17 56 33 -106 0 0 17 9 51 7 36 27 20 116 -49 16 55 31 17 24 13 16 33 50 17 46 8 -105 0 0 16 59 55 7 36 33 21 116 -49 16 45 37 17 14 17 16 23 57 17 36 11 -104 0 0 16 50 27 7 36 39 22 116 -49 16 36 9 17 4 47 16 14 30 17 26 40 -103 0 0 16 41 26 7 36 46 23 117 -49 16 27 9 16 55 45 16 5 31 17 17 37 -102 0 0 16 32 52 7 36 52 24 117 -49 16 18 36 16 47 11 15 56 59 17 9 1 -101 0 0 16 24 46 7 36 59 25 118 -49 16 10 30 16 39 4 15 48 55 17 0 53 -100 0 0 16 17 7 7 37 7 26 118 -49 16 2 53 16 31 25 15 41 18 16 53 13 - 99 0 0 16 9 57 7 37 14 27 119 -48 15 55 43 16 24 14 15 34 10 16 46 1 - 98 0 0 16 3 15 7 37 22 28 119 -48 15 49 2 16 17 32 15 27 30 16 39 18 - 97 0 0 15 57 2 7 37 30 29 120 -48 15 42 49 16 11 18 15 21 17 16 33 3 - 96 0 0 15 51 18 7 37 38 30 120 -47 15 37 5 16 5 33 15 15 34 16 27 18 - 95 0 0 15 46 2 7 37 46 31 121 -47 15 31 50 16 0 16 15 10 19 16 22 1 - 94 0 0 15 41 15 7 37 55 31 121 -47 15 27 3 15 55 29 15 5 34 16 17 13 - 93 0 0 15 36 57 7 38 4 32 122 -46 15 22 46 15 51 11 15 1 17 16 12 55 - 92 0 0 15 33 9 7 38 13 33 122 -46 15 18 58 15 47 23 14 57 29 16 9 6 - 91 0 0 15 29 51 7 38 22 34 123 -45 15 15 40 15 44 4 14 54 11 16 5 47 - 90 0 0 15 27 2 7 38 32 35 124 -45 15 12 51 15 41 15 14 51 23 16 2 57 - 89 0 0 15 24 42 7 38 42 36 124 -44 15 10 32 15 38 55 14 49 3 16 0 37 - 88 0 0 15 22 53 7 38 52 37 125 -44 15 8 42 15 37 6 14 47 14 15 58 48 - 87 0 0 15 21 33 7 39 2 37 126 -43 15 7 23 15 35 46 14 45 55 15 57 28 - 86 0 0 15 20 44 7 39 13 38 126 -43 15 6 33 15 34 57 14 45 5 15 56 39 - 85 0 0 15 20 24 7 39 23 39 127 -42 15 6 14 15 34 38 14 44 45 15 56 20 - 84 0 0 15 20 35 7 39 34 40 128 -41 15 6 24 15 34 49 14 44 56 15 56 31 - 83 0 0 15 21 17 7 39 45 41 129 -41 15 7 5 15 35 30 14 45 37 15 57 13 - 82 0 0 15 22 28 7 39 56 41 130 -40 15 8 17 15 36 42 14 46 47 15 58 25 - 81 0 0 15 24 10 7 40 8 42 131 -39 15 9 58 15 38 24 14 48 28 16 0 8 - 80 0 0 15 26 22 7 40 19 43 131 -39 15 12 10 15 40 37 14 50 40 16 2 21 - 79 0 0 15 29 5 7 40 31 44 132 -38 15 14 52 15 43 20 14 53 21 16 5 5 - 78 0 0 15 32 18 7 40 43 44 133 -37 15 18 5 15 46 34 14 56 33 16 8 20 - 77 0 0 15 36 2 7 40 55 45 134 -36 15 21 48 15 50 18 15 0 16 16 12 5 - 76 0 0 15 40 16 7 41 7 46 135 -36 15 26 2 15 54 33 15 4 28 16 16 21 - 75 0 0 15 45 1 7 41 19 46 137 -35 15 30 46 15 59 18 15 9 11 16 21 7 - 74 0 0 15 50 16 7 41 32 47 138 -34 15 36 0 16 4 34 15 14 25 16 26 24 - 73 0 0 15 56 1 7 41 44 48 139 -33 15 41 45 16 10 20 15 20 8 16 32 11 - 72 0 0 16 2 17 7 41 57 48 140 -32 15 48 0 16 16 37 15 26 22 16 38 29 - 71 0 0 16 9 3 7 42 10 49 141 -31 15 54 45 16 23 24 15 33 6 16 45 18 - 70 0 0 16 16 19 7 42 23 49 143 -31 16 2 0 16 30 41 15 40 20 16 52 36 - 69 0 0 16 24 6 7 42 36 50 144 -30 16 9 46 16 38 28 15 48 3 17 0 25 - 68 0 0 16 32 22 7 42 49 50 145 -29 16 18 1 16 46 46 15 56 17 17 8 44 - 67 0 0 16 41 8 7 43 2 51 147 -28 16 26 46 16 55 33 16 5 1 17 17 33 - 66 0 0 16 50 24 7 43 16 51 148 -27 16 36 1 17 4 50 16 14 14 17 26 52 - 65 0 0 17 0 10 7 43 29 51 150 -26 16 45 45 17 14 37 16 23 56 17 36 40 - 64 0 0 17 10 24 7 43 43 52 151 -25 16 55 59 17 24 53 16 34 8 17 46 58 - 63 0 0 17 21 9 7 43 56 52 153 -24 17 6 42 17 35 38 16 44 49 17 57 46 - 62 0 0 17 32 22 7 44 10 52 154 -23 17 17 54 17 46 53 16 55 59 18 9 2 - 61 0 0 17 44 4 7 44 24 53 156 -22 17 29 35 17 58 37 17 7 38 18 20 48 - 60 0 0 17 56 15 7 44 38 53 158 -22 17 41 44 18 10 49 17 19 45 18 33 2 - 59 0 0 18 8 54 7 44 52 53 159 -21 17 54 22 18 23 30 17 32 21 18 45 45 - 58 0 0 18 22 2 7 45 5 53 161 -20 18 7 28 18 36 39 17 45 25 18 58 57 - 57 0 0 18 35 37 7 45 19 53 163 -19 18 21 2 18 50 15 17 58 57 19 12 36 - 56 0 0 18 49 40 7 45 33 53 164 -18 18 35 3 19 4 20 18 12 56 19 26 43 - 55 0 0 19 4 10 7 45 47 53 166 -17 18 49 32 19 18 52 18 27 22 19 41 17 - 54 0 0 19 19 8 7 46 1 53 168 -16 19 4 27 19 33 51 18 42 15 19 56 18 - 53 0 0 19 34 31 7 46 15 53 170 -15 19 19 50 19 49 16 18 57 35 20 11 46 - 52 0 0 19 50 22 7 46 29 53 171 -14 19 35 38 20 5 8 19 13 21 20 27 41 - 51 0 0 20 6 38 7 46 43 53 173 -13 19 51 53 20 21 26 19 29 33 20 44 1 - 50 0 0 20 23 19 7 46 57 53 175 -12 20 8 32 20 38 9 19 46 10 21 0 47 - 49 0 0 20 40 26 7 47 11 53 176 -11 20 25 37 20 55 17 20 3 12 21 17 58 - 48 0 0 20 57 57 7 47 24 52 178 -10 20 43 7 21 12 50 20 20 39 21 35 34 - 47 0 0 21 15 53 7 47 38 52 180 -9 21 1 1 21 30 48 20 38 30 21 53 34 - 46 0 0 21 34 12 7 47 52 52 181 -8 21 19 18 21 49 9 20 56 45 22 11 58 - 45 0 0 21 52 54 7 48 6 52 183 -7 21 37 59 22 7 53 21 15 23 22 30 45 - 44 0 0 22 11 59 7 48 19 51 185 -6 21 57 2 22 27 0 21 34 24 22 49 54 - 43 0 0 22 31 27 7 48 33 51 186 -5 22 16 28 22 46 29 21 53 47 23 9 26 - 42 0 0 22 51 16 7 48 46 50 188 -4 22 36 15 23 6 20 22 13 31 23 29 20 - 41 0 0 23 11 26 7 48 59 50 189 -3 22 56 23 23 26 32 22 33 37 23 49 35 - 40 0 0 23 31 56 7 49 12 49 191 -2 23 16 52 23 47 4 22 54 3 24 10 10 - 39 0 0 23 52 47 7 49 26 49 192 -1 23 37 41 24 7 56 23 14 49 24 31 5 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6362-00084-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 38 59.8786 DE: -16 42 28.003 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .023 ) * V mag [mag]: 10.8 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (435) Ella approx. diameter [km]: 42 approx. diameter ["]: .036 distance from Earth [AU]: 1.60000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 918 number of rejected observations: 101 time covered by the observations: 1900 Feb 23 - 2008 Jan 31 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.015, 70° remarks: * orbital elements for (435) Ella : Mean anomaly = 314.95198069 deg Arg. of pericenter = 333.00792301 deg Long. of node = 23.27192627 deg Inclination = 1.81699559 deg Eccentricity = 0.15528641 Semimajor axis = 2.45015733 AU Perihelion dist = 2.06968120 AU Mag: H = 10.31, G = 0.15 Epoch of elements : MJD 54988.32300000 TDT (2009 Jun 06.323) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 6 435 Ella 7h 45.8m UT 10.8 21 38 59.879-16 42 28.00TYC 6362-00084-1 11.7 14.1 42 5.0 1.600 1.725 5.97 -46.5642 -16.709 63.22 22.68 7.7636 -0.13883 0.57962 4.51173 1.08695 -0.00457 -0.00147 2000 312.8130692009 529.00000333.007923 23.271926 1.8169960.15528641 2.4501573 2.069681210.2 5.00.15 RATE 2.5698810 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.027 80 1.76 0.028 0 54545.5020090606_0084-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org