IOTA/IOTA-ES occultation update for (1398) Donnera / TYC 7397-00651-1 event on 2008 May 21, 11:24 UT Visible from W Pacific Islands Summary ------- On 2008 May 21 UT, the 29 km diameter asteroid (1398) Donnera will occult a 9.4 mag star in the constellation Sagittarius for observers along a path across W Pacific Islands. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.1 mag (the magnitude of the asteroid) for at most 3.5 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: 36 * date and approx. time of event: 2008 May 21, 11:13 - 2008 May 21, 11:37 UT * midpoint of event [JD]: 2454607.97515833 * magnitude of target star: 9.4 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 3.5 * Moon: 98 % sunlit, 19° distance * Sun: 145° distance * rough path description: W Pacific Islands The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 1.84 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .031", 80° ) * approx speed of asteroid's shadow [km/s]: 8.1951 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7397-00651-1 by 1398 Donnera on 2008 May 21 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 138 0 0 9 47 38 11 37 1 0 123 -35 9 57 11 9 38 5 .. .. .. 9 2 58 139 0 0 9 9 8 11 37 1 1 123 -36 9 18 41 8 59 36 9 53 54 8 24 31 140 0 0 8 30 41 11 37 1 3 123 -37 8 40 14 8 21 9 9 15 25 7 46 6 141 0 0 7 52 19 11 37 0 4 123 -38 8 1 51 7 42 47 8 36 59 7 7 46 142 0 0 7 14 1 11 36 58 5 124 -40 7 23 32 7 4 30 7 58 38 6 29 32 143 0 0 6 35 50 11 36 57 6 124 -41 6 45 20 6 26 19 7 20 23 5 51 24 144 0 0 5 57 46 11 36 55 7 124 -42 6 7 16 5 48 17 6 42 16 5 13 24 145 0 0 5 19 51 11 36 53 8 124 -43 5 29 20 5 10 23 6 4 17 4 35 34 146 0 0 4 42 7 11 36 50 10 124 -44 4 51 35 4 32 39 5 26 28 3 57 53 147 0 0 4 4 34 11 36 47 11 124 -45 4 14 1 3 55 7 4 48 50 3 20 25 148 0 0 3 27 13 11 36 44 12 124 -47 3 36 39 3 17 47 4 11 25 2 43 9 149 0 0 2 50 5 11 36 41 13 124 -48 2 59 30 2 40 41 3 34 12 2 6 6 150 0 0 2 13 12 11 36 37 14 124 -49 2 22 36 2 3 49 2 57 14 1 29 19 151 0 0 1 36 35 11 36 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32 28 -169 0 0 -17 11 55 11 30 53 57 124 -84 -17 3 32 -17 20 18 -16 32 39 -17 51 6 -168 0 0 -17 30 9 11 30 42 58 124 -84 -17 21 47 -17 38 30 -16 50 58 -18 9 14 -167 0 0 -17 47 52 11 30 31 59 124 -83 -17 39 31 -17 56 12 -17 8 47 -18 26 52 -166 0 0 -18 5 4 11 30 19 60 124 -82 -17 56 45 -18 13 24 -17 26 5 -18 43 59 -165 0 0 -18 21 47 11 30 8 61 125 -82 -18 13 28 -18 30 5 -17 42 53 -19 0 35 -164 0 0 -18 37 58 11 29 56 62 125 -81 -18 29 41 -18 46 15 -17 59 10 -19 16 42 -163 0 0 -18 53 40 11 29 45 63 125 -80 -18 45 24 -19 1 56 -18 14 57 -19 32 18 -162 0 0 -19 8 51 11 29 33 64 125 -79 -19 0 36 -19 17 6 -18 30 13 -19 47 24 -161 0 0 -19 23 32 11 29 22 65 126 -78 -19 15 18 -19 31 46 -18 44 59 -20 2 0 -160 0 0 -19 37 43 11 29 10 65 126 -78 -19 29 30 -19 45 56 -18 59 15 -20 16 6 -159 0 0 -19 51 24 11 28 59 66 127 -77 -19 43 12 -19 59 35 -19 13 0 -20 29 43 -158 0 0 -20 4 35 11 28 47 67 127 -76 -19 56 24 -20 12 45 -19 26 16 -20 42 49 -157 0 0 -20 17 16 11 28 35 68 128 -75 -20 9 6 -20 25 26 -19 39 1 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54 53 -143 0 0 -22 23 16 11 25 50 78 149 -63 -22 15 15 -22 31 16 -21 45 45 -23 0 42 -142 0 0 -22 28 37 11 25 38 78 152 -62 -22 20 37 -22 36 37 -21 51 9 -23 6 2 -141 0 0 -22 33 30 11 25 26 79 156 -61 -22 25 30 -22 41 30 -21 56 3 -23 10 53 -140 0 0 -22 37 54 11 25 14 79 159 -60 -22 29 55 -22 45 53 -22 0 29 -23 15 15 -139 0 0 -22 41 50 11 25 2 80 164 -59 -22 33 50 -22 49 48 -22 4 26 -23 19 9 -138 0 0 -22 45 16 11 24 50 80 168 -58 -22 37 17 -22 53 15 -22 7 54 -23 22 35 -137 0 0 -22 48 14 11 24 38 80 172 -57 -22 40 16 -22 56 13 -22 10 53 -23 25 32 -136 0 0 -22 50 44 11 24 26 80 177 -57 -22 42 45 -22 58 42 -22 13 23 -23 28 0 -135 0 0 -22 52 44 11 24 14 80 182 -56 -22 44 46 -23 0 42 -22 15 24 -23 30 0 -134 0 0 -22 54 17 11 24 2 80 187 -55 -22 46 18 -23 2 14 -22 16 57 -23 31 32 -133 0 0 -22 55 20 11 23 51 80 191 -54 -22 47 22 -23 3 18 -22 18 1 -23 32 35 -132 0 0 -22 55 55 11 23 39 80 196 -53 -22 47 57 -23 3 53 -22 18 36 -23 33 10 -131 0 0 -22 56 2 11 23 27 80 200 -52 -22 48 4 -23 3 59 -22 18 43 -23 33 16 -130 0 0 -22 55 39 11 23 15 79 204 -51 -22 47 41 -23 3 37 -22 18 20 -23 32 54 -129 0 0 -22 54 49 11 23 3 79 208 -50 -22 46 51 -23 2 47 -22 17 29 -23 32 4 -128 0 0 -22 53 29 11 22 51 78 211 -50 -22 45 31 -23 1 27 -22 16 10 -23 30 45 -127 0 0 -22 51 41 11 22 39 78 214 -49 -22 43 43 -22 59 39 -22 14 21 -23 28 57 -126 0 0 -22 49 25 11 22 28 77 217 -48 -22 41 26 -22 57 23 -22 12 3 -23 26 42 -125 0 0 -22 46 39 11 22 16 77 220 -47 -22 38 41 -22 54 38 -22 9 17 -23 23 57 -124 0 0 -22 43 26 11 22 4 76 222 -46 -22 35 27 -22 51 24 -22 6 2 -23 20 45 -123 0 0 -22 39 43 11 21 52 76 224 -45 -22 31 44 -22 47 42 -22 2 18 -23 17 3 -122 0 0 -22 35 31 11 21 41 75 226 -44 -22 27 32 -22 43 31 -21 58 5 -23 12 53 -121 0 0 -22 30 51 11 21 29 74 228 -43 -22 22 51 -22 38 51 -21 53 23 -23 8 15 -120 0 0 -22 25 42 11 21 17 73 229 -42 -22 17 42 -22 33 42 -21 48 12 -23 3 7 -119 0 0 -22 20 4 11 21 5 73 230 -42 -22 12 3 -22 28 4 -21 42 32 -22 57 31 -118 0 0 -22 13 57 11 20 54 72 231 -41 -22 5 56 -22 21 58 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18 7 -19 31 39 -20 48 10 -104 0 0 -19 56 57 11 18 14 60 239 -28 -19 48 45 -20 5 8 -19 18 34 -20 35 14 -103 0 0 -19 43 26 11 18 3 60 239 -27 -19 35 14 -19 51 38 -19 4 59 -20 21 48 -102 0 0 -19 29 25 11 17 52 59 239 -26 -19 21 12 -19 37 39 -18 50 54 -20 7 52 -101 0 0 -19 14 54 11 17 41 58 239 -25 -19 6 40 -19 23 9 -18 36 17 -19 53 26 -100 0 0 -18 59 53 11 17 30 57 239 -24 -18 51 37 -19 8 8 -18 21 11 -19 38 30 - 99 0 0 -18 44 21 11 17 20 56 239 -23 -18 36 4 -18 52 37 -18 5 34 -19 23 3 - 98 0 0 -18 28 18 11 17 9 55 239 -22 -18 20 0 -18 36 36 -17 49 26 -19 7 6 - 97 0 0 -18 11 45 11 16 58 54 239 -22 -18 3 26 -18 20 4 -17 32 47 -18 50 38 - 96 0 0 -17 54 41 11 16 48 53 239 -21 -17 46 21 -18 3 1 -17 15 37 -18 33 40 - 95 0 0 -17 37 6 11 16 37 52 239 -20 -17 28 45 -17 45 28 -16 57 57 -18 16 11 - 94 0 0 -17 19 1 11 16 27 51 239 -19 -17 10 38 -17 27 24 -16 39 45 -17 58 11 - 93 0 0 -17 0 24 11 16 16 50 239 -18 -16 52 0 -17 8 48 -16 21 3 -17 39 41 - 92 0 0 -16 41 17 11 16 6 50 239 -17 -16 32 52 -16 49 42 -16 1 49 -17 20 40 - 91 0 0 -16 21 39 11 15 56 49 239 -16 -16 13 12 -16 30 5 -15 42 4 -17 1 8 - 90 0 0 -16 1 29 11 15 46 48 239 -15 -15 53 1 -16 9 57 -15 21 49 -16 41 5 - 89 0 0 -15 40 49 11 15 36 47 239 -14 -15 32 19 -15 49 18 -15 1 2 -16 20 31 - 88 0 0 -15 19 37 11 15 26 46 239 -13 -15 11 6 -15 28 8 -14 39 43 -15 59 26 - 87 0 0 -14 57 55 11 15 16 45 239 -12 -14 49 22 -15 6 27 -14 17 54 -15 37 50 - 86 0 0 -14 35 41 11 15 7 44 239 -11 -14 27 7 -14 44 15 -13 55 33 -15 15 43 - 85 0 0 -14 12 56 11 14 57 43 239 -10 -14 4 21 -14 21 32 -13 32 42 -14 53 5 - 84 0 0 -13 49 41 11 14 48 42 239 -9 -13 41 4 -13 58 18 -13 9 19 -14 29 57 - 83 0 0 -13 25 54 11 14 39 41 239 -8 -13 17 16 -13 34 32 -12 45 25 -14 6 17 - 82 0 0 -13 1 37 11 14 30 40 238 -7 -12 52 57 -13 10 17 -12 21 1 -13 42 7 - 81 0 0 -12 36 49 11 14 21 39 238 -6 -12 28 7 -12 45 30 -11 56 5 -13 17 26 - 80 0 0 -12 11 30 11 14 12 38 238 -5 -12 2 46 -12 20 13 -11 30 39 -12 52 15 - 79 0 0 -11 45 40 11 14 3 37 238 -4 -11 36 55 -11 54 25 -11 4 42 -12 26 33 - 78 0 0 -11 19 20 11 13 55 36 238 -3 -11 10 34 -11 28 6 -10 38 14 -12 0 20 - 77 0 0 -10 52 30 11 13 47 35 238 -2 -10 43 42 -11 1 18 -10 11 16 -11 33 37 - 76 0 0 -10 25 10 11 13 39 34 238 -1 -10 16 20 -10 33 59 - 9 43 49 -11 6 25 Uncertainty in time = +/- 9 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: TYC 7397-00651-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 04.1416 DE: -32 22 03.272 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 9.4 * B mag [mag]: 9.5 * Apparent position with proper motion RA(deg): 275.1627017855 DE(deg): -32.3645994006 * Equation of equinoxes (radians) : 0.000040319289491 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1398) Donnera approx. diameter [km]: 29 approx. diameter ["]: .017 distance from Earth [AU]: 2.33200 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 719 number of rejected observations: 34 time covered by the observations: 1936 Aug 26 - 2007 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.024, 77° remarks: * orbital elements for (1398) Donnera : Mean anomaly = 266.93760639 deg Arg. of pericenter = 71.87269917 deg Long. of node = 297.19876940 deg Inclination = 11.83518024 deg Eccentricity = 0.10990523 Semimajor axis = 3.15967948 AU Perihelion dist = 2.81241417 AU Mag: H = 10.15, G = 0.15 Epoch of elements : MJD 54607.47500000 TDT (2008 May 21.475) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 1398 Donnera 11h 24.2m UT 9.4 18 20 4.142-32 22 3.27TYC 7397-00651-1 9.5 15.1 29 3.5 2.332 -1.377 0.64 -135.5161 -32.368 8.10 20.31 11.4038 0.00690 0.16704 -4.62242 0.16928 -0.00317 0.00063 2000 265.6258572008 514.00000 71.872699297.198769 11.8351800.10990523 3.1596795 2.812414210.1 5.00.15 RATE 1.7548480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.031 80 2.84 0.032 0 54565.5020080521_0651-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org