IOTA/IOTA-ES occultation update for (2659) Millis / TYC 6277-00907-1 event on 2009 Apr 01, 10:03 UT Visible from Summary ------- On 2009 Apr 01 UT, the 26 km diameter asteroid (2659) Millis 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 7.3 mag to 17.1 mag (the magnitude of the asteroid) for at most 2.3 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: 19 * date and approx. time of event: 2009 Apr 01, 09:58 - 2009 Apr 01, 10:04 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 2.3 * Moon: 37 % sunlit, 170° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 3.56 * 1 sigma uncertainty interval [seconds]: +/- 11.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .043", 89° ) * approx speed of asteroid's shadow [km/s]: 11.3544 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6277-00907-1 by 2659 Millis on 2009 Apr 1 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 Latitude Latitude Latitude Latitude - 64 0 0 31 32 1 10 4 32 37 182 -1 31 20 13 31 43 53 29 57 40 33 9 58 - 65 0 0 31 23 48 10 4 23 37 181 -2 31 12 1 31 35 38 29 49 35 33 1 34 - 66 0 0 31 16 10 10 4 15 37 180 -3 31 4 24 31 28 0 29 42 7 32 53 47 - 67 0 0 31 9 9 10 4 6 37 179 -4 30 57 24 31 20 57 29 35 13 32 46 37 - 68 0 0 31 2 45 10 3 57 37 178 -4 30 51 1 31 14 32 29 28 56 32 40 4 - 69 0 0 30 56 56 10 3 48 37 176 -5 30 45 13 31 8 43 29 23 14 32 34 9 - 70 0 0 30 51 45 10 3 40 37 175 -6 30 40 2 31 3 30 29 18 9 32 28 51 - 71 0 0 30 47 10 10 3 31 37 174 -7 30 35 28 30 58 55 29 13 39 32 24 10 - 72 0 0 30 43 12 10 3 22 37 173 -8 30 31 31 30 54 56 29 9 46 32 20 7 - 73 0 0 30 39 51 10 3 13 37 171 -9 30 28 10 30 51 35 29 6 29 32 16 41 - 74 0 0 30 37 6 10 3 5 37 170 -10 30 25 26 30 48 50 29 3 48 32 13 53 - 75 0 0 30 34 59 10 2 56 37 169 -11 30 23 19 30 46 42 29 1 43 32 11 43 - 76 0 0 30 33 29 10 2 47 37 168 -12 30 21 49 30 45 11 29 0 15 32 10 10 - 77 0 0 30 32 35 10 2 39 36 167 -12 30 20 56 30 44 18 28 59 23 32 9 15 - 78 0 0 30 32 19 10 2 30 36 166 -13 30 20 40 30 44 1 28 59 7 32 8 58 - 79 0 0 30 32 39 10 2 21 36 164 -14 30 21 0 30 44 22 28 59 27 32 9 19 - 80 0 0 30 33 37 10 2 13 36 163 -15 30 21 57 30 45 19 29 0 24 32 10 17 - 81 0 0 30 35 11 10 2 4 35 162 -16 30 23 32 30 46 54 29 1 57 32 11 53 - 82 0 0 30 37 22 10 1 56 35 161 -17 30 25 43 30 49 5 29 4 6 32 14 6 - 83 0 0 30 40 10 10 1 48 35 160 -18 30 28 30 30 51 54 29 6 52 32 16 57 - 84 0 0 30 43 35 10 1 40 34 159 -18 30 31 54 30 55 19 29 10 13 32 20 25 - 85 0 0 30 47 36 10 1 31 34 158 -19 30 35 55 30 59 20 29 14 10 32 24 31 - 86 0 0 30 52 14 10 1 23 34 157 -20 30 40 32 31 3 59 29 18 43 32 29 14 - 87 0 0 30 57 28 10 1 15 33 156 -21 30 45 46 31 9 14 29 23 52 32 34 34 - 88 0 0 31 3 18 10 1 8 33 155 -22 30 51 35 31 15 5 29 29 36 32 40 31 - 89 0 0 31 9 45 10 1 0 32 154 -22 30 58 1 31 21 32 29 35 56 32 47 5 - 90 0 0 31 16 47 10 0 52 32 153 -23 31 5 2 31 28 35 29 42 52 32 54 15 - 91 0 0 31 24 25 10 0 45 31 152 -24 31 12 39 31 36 15 29 50 22 33 2 2 - 92 0 0 31 32 39 10 0 37 31 151 -25 31 20 52 31 44 30 29 58 27 33 10 26 - 93 0 0 31 41 28 10 0 30 30 150 -25 31 29 40 31 53 20 30 7 7 33 19 25 - 94 0 0 31 50 53 10 0 23 30 149 -26 31 39 3 32 2 46 30 16 22 33 29 1 - 95 0 0 32 0 52 10 0 16 29 148 -27 31 49 1 32 12 46 30 26 11 33 39 12 - 96 0 0 32 11 26 10 0 9 28 147 -28 31 59 34 32 23 22 30 36 34 33 49 58 - 97 0 0 32 22 35 10 0 2 28 146 -28 32 10 41 32 34 32 30 47 30 34 1 20 - 98 0 0 32 34 17 9 59 55 27 145 -29 32 22 22 32 46 16 30 59 1 34 13 16 - 99 0 0 32 46 34 9 59 49 26 144 -30 32 34 37 32 58 34 31 11 5 34 25 47 -100 0 0 32 59 24 9 59 42 26 144 -30 32 47 25 33 11 26 31 23 41 34 38 53 -101 0 0 33 12 48 9 59 36 25 143 -31 33 0 47 33 24 52 31 36 51 34 52 32 -102 0 0 33 26 44 9 59 30 24 142 -32 33 14 42 33 38 50 31 50 32 35 6 45 -103 0 0 33 41 13 9 59 24 24 141 -32 33 29 9 33 53 21 32 4 46 35 21 31 -104 0 0 33 56 14 9 59 19 23 140 -33 33 44 8 34 8 25 32 19 32 35 36 50 -105 0 0 34 11 48 9 59 13 22 140 -33 33 59 39 34 24 0 32 34 48 35 52 42 -106 0 0 34 27 52 9 59 8 21 139 -34 34 15 41 34 40 7 32 50 36 36 9 6 -107 0 0 34 44 28 9 59 3 21 138 -34 34 32 15 34 56 44 33 6 54 36 26 1 -108 0 0 35 1 34 9 58 58 20 137 -35 34 49 18 35 13 53 33 23 42 36 43 27 -109 0 0 35 19 10 9 58 53 19 137 -35 35 6 52 35 31 32 33 41 0 37 1 25 -110 0 0 35 37 16 9 58 48 18 136 -36 35 24 56 35 49 40 33 58 47 37 19 52 -111 0 0 35 55 51 9 58 44 17 135 -36 35 43 28 36 8 18 34 17 2 37 38 49 -112 0 0 36 14 55 9 58 40 17 134 -37 36 2 29 36 27 24 34 35 46 37 58 16 -113 0 0 36 34 26 9 58 36 16 134 -37 36 21 58 36 46 58 34 54 57 38 18 11 -114 0 0 36 54 26 9 58 32 15 133 -37 36 41 55 37 7 0 35 14 35 38 38 34 -115 0 0 37 14 52 9 58 28 14 132 -38 37 2 18 37 27 30 35 34 40 38 59 25 -116 0 0 37 35 44 9 58 25 13 132 -38 37 23 8 37 48 25 35 55 11 39 20 42 -117 0 0 37 57 3 9 58 22 13 131 -38 37 44 23 38 9 46 36 16 7 39 42 26 -118 0 0 38 18 46 9 58 19 12 130 -39 38 6 4 38 31 33 36 37 28 40 4 35 -119 0 0 38 40 54 9 58 16 11 130 -39 38 28 9 38 53 44 36 59 13 40 27 9 -120 0 0 39 3 26 9 58 14 10 129 -39 38 50 37 39 16 18 37 21 21 40 50 8 -121 0 0 39 26 21 9 58 11 9 128 -39 39 13 29 39 39 16 37 43 52 41 13 30 -122 0 0 39 49 38 9 58 9 8 128 -39 39 36 43 40 2 37 38 6 45 41 37 14 -123 0 0 40 13 16 9 58 7 7 127 -39 40 0 19 40 26 19 38 30 0 42 1 21 -124 0 0 40 37 16 9 58 6 7 126 -40 40 24 15 40 50 21 .. .. .. 42 25 49 -125 0 0 41 1 36 9 58 4 6 126 -40 40 48 32 41 14 44 .. .. .. 42 50 37 -126 0 0 41 26 15 9 58 3 5 125 -40 41 13 7 41 39 27 .. .. .. 43 15 45 -127 0 0 41 51 12 9 58 2 4 124 -40 41 38 2 42 4 28 .. .. .. 43 41 12 -128 0 0 42 16 28 9 58 1 3 124 -40 42 3 13 42 29 46 .. .. .. 44 6 57 -129 0 0 42 42 0 9 58 0 2 123 -40 42 28 42 42 55 22 .. .. .. 44 32 58 -130 0 0 43 7 48 9 58 0 1 122 -39 42 54 27 43 21 13 .. .. .. 44 59 16 -131 0 0 43 33 51 9 58 0 1 122 -39 43 20 26 43 47 20 .. .. .. .. .. .. Uncertainty in time = +/- 12 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6277-00907-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 33.9205 DE: -21 57 02.817 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .023 ) * V mag [mag]: 9.8 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2659) Millis approx. diameter [km]: 26 approx. diameter ["]: .012 distance from Earth [AU]: 3.05300 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 944 number of rejected observations: 30 time covered by the observations: 1958 Feb 24 - 2008 Mar 16 1 sigma uncertainty ellipse (major, minor, PA): 0.057, 0.036, 89° remarks: * orbital elements for (2659) Millis : Mean anomaly = 120.89007740 deg Arg. of pericenter = 328.79398749 deg Long. of node = 157.25063524 deg Inclination = 1.31506679 deg Eccentricity = 0.11253145 Semimajor axis = 3.12124242 AU Perihelion dist = 2.77000447 AU Mag: H = 11.61, G = 0.15 Epoch of elements : MJD 54922.41900000 TDT (2009 Apr 01.419) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 1 2659 Millis 10h 3.6m UT 9.8 18 19 33.920-21 57 2.82TYC 6277-00907-1 11.2 17.1 26 2.3 3.053 1.322 1.52 -65.9207 -21.951 30.06 4.67 10.0607 -0.06507 0.79313 6.38705 0.52716 -0.00583 -0.00022 2000 120.4577142009 330.00000328.793987157.250635 1.3150670.11253145 3.1212424 2.770004511.2 5.00.15 RATE 1.7873630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.043 89 4.56 0.042 0 54581.5020090401_0907-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org