IOTA/IOTA-ES occultation update for (572) Rebekka / UCAC2 30779321 event on 2009 Oct 01, 20:43 UT Visible from Summary ------- On 2009 Oct 01 UT, the 30 km diameter asteroid (572) Rebekka will occult a 11.5 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 13.8 mag (the magnitude of the asteroid) for at most 4.8 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: 2009 Oct 01, 20:26 - 2009 Oct 01, 20:57 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 4.8 * Moon: 94 % sunlit, 9° distance * Sun: 143° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 1.87 * 1 sigma uncertainty interval [seconds]: +/- 9.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .066 +/- .064) * 1 sigma uncertainty ellipse (major, minor, PA): ( .066", .064", 85° ) * approx speed of asteroid's shadow [km/s]: 6.2125 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 30779321 by 572 Rebekka on 2009 Oct 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 7 40 21 86 0 0 20 26 24 1 173 -6 5 40 23 9 39 46 - 1 55 45 17 4 11 8 55 35 85 0 0 20 26 24 2 175 -7 7 19 52 10 31 1 1 18 2 16 26 43 9 43 10 84 0 0 20 26 25 3 175 -8 8 23 29 11 2 41 3 23 11 15 59 19 10 14 57 83 0 0 20 26 26 4 176 -9 9 6 40 11 23 9 4 49 46 15 37 37 10 36 52 82 0 0 20 26 28 5 176 -10 9 37 5 11 36 34 5 52 28 15 19 28 10 52 10 81 0 0 20 26 30 6 177 -10 9 58 59 11 45 17 6 39 21 15 3 39 11 2 48 80 0 0 20 26 32 7 177 -11 10 14 53 11 50 40 7 15 9 14 49 25 11 10 2 79 0 0 20 26 34 8 177 -12 10 26 26 11 53 36 7 42 54 14 36 21 11 14 41 78 0 0 20 26 37 9 177 -13 10 34 40 11 54 41 8 4 36 14 24 5 11 17 20 77 0 0 20 26 40 10 177 -13 10 40 20 11 54 19 8 21 39 14 12 27 11 18 23 76 0 0 20 26 43 11 177 -14 10 43 58 11 52 47 8 35 0 14 1 17 11 18 9 75 0 0 20 26 47 12 177 -15 10 45 58 11 50 18 8 45 24 13 50 28 11 16 50 74 0 0 20 26 51 13 177 -16 10 46 36 11 47 2 8 53 23 13 39 55 11 14 37 73 0 0 20 26 55 14 177 -17 10 46 7 11 43 7 8 59 20 13 29 34 11 11 38 72 0 0 20 27 0 15 177 -17 10 44 39 11 38 36 9 3 36 13 19 22 11 8 0 71 0 0 20 27 5 16 177 -18 10 42 23 11 33 36 9 6 26 13 9 17 11 3 46 70 0 0 20 27 10 17 177 -19 10 39 23 11 28 9 9 8 1 12 59 16 10 59 3 69 0 0 20 27 15 18 177 -19 10 35 45 11 22 20 9 8 32 12 49 19 10 53 52 68 0 0 20 27 21 19 177 -20 10 31 34 11 16 8 9 8 6 12 39 24 10 48 16 67 0 0 20 27 27 20 177 -21 10 26 53 11 9 38 9 6 50 12 29 30 10 42 18 66 0 0 20 27 34 21 176 -22 10 21 45 11 2 50 9 4 49 12 19 35 10 35 59 65 0 0 20 27 41 22 176 -22 10 16 12 10 55 46 9 2 8 12 9 40 10 29 22 64 0 0 20 27 48 23 176 -23 10 10 17 10 48 27 8 58 51 11 59 43 10 22 27 63 0 0 20 27 55 24 176 -24 10 4 1 10 40 53 8 55 1 11 49 45 10 15 17 62 0 0 20 28 3 25 176 -24 9 57 26 10 33 6 8 50 40 11 39 43 10 7 50 61 0 0 20 28 10 26 176 -25 9 50 34 10 25 7 8 45 52 11 29 39 10 0 10 60 0 0 20 28 19 27 176 -26 9 43 24 10 16 55 8 40 39 11 19 31 9 52 15 59 0 0 20 28 27 28 176 -26 9 35 58 10 8 31 8 35 2 11 9 20 9 44 8 58 0 0 20 28 36 29 175 -27 9 28 18 9 59 57 8 29 2 10 59 5 9 35 48 57 0 0 20 28 45 30 175 -28 9 20 23 9 51 12 8 22 42 10 48 46 9 27 15 56 0 0 20 28 54 31 175 -28 9 12 15 9 42 16 8 16 2 10 38 22 9 18 32 55 0 0 20 29 4 32 175 -29 9 3 53 9 33 10 8 9 3 10 27 53 9 9 37 54 0 0 20 29 14 33 175 -30 8 55 19 9 23 54 8 1 47 10 17 20 9 0 31 53 0 0 20 29 24 34 175 -30 8 46 33 9 14 29 7 54 14 10 6 41 8 51 14 52 0 0 20 29 34 35 174 -31 8 37 34 9 4 54 7 46 25 9 55 57 8 41 48 51 0 0 20 29 45 36 174 -31 8 28 25 8 55 10 7 38 20 9 45 8 8 32 10 50 0 0 20 29 56 37 174 -32 8 19 4 8 45 16 7 30 1 9 34 13 8 22 23 49 0 0 20 30 7 38 174 -32 8 9 33 8 35 14 7 21 28 9 23 13 8 12 26 48 0 0 20 30 19 39 173 -33 7 59 50 8 25 2 7 12 40 9 12 6 8 2 20 47 0 0 20 30 30 40 173 -34 7 49 58 8 14 42 7 3 39 9 0 54 7 52 4 46 0 0 20 30 42 41 173 -34 7 39 55 8 4 13 6 54 26 8 49 36 7 41 38 45 0 0 20 30 54 42 173 -35 7 29 42 7 53 35 6 44 59 8 38 11 7 31 3 44 0 0 20 31 7 43 172 -35 7 19 19 7 42 48 6 35 20 8 26 41 7 20 19 43 0 0 20 31 19 44 172 -36 7 8 46 7 31 52 6 25 29 8 15 3 7 9 26 42 0 0 20 31 32 45 172 -36 6 58 3 7 20 48 6 15 26 8 3 20 6 58 23 41 0 0 20 31 45 46 171 -37 6 47 10 7 9 36 6 5 11 7 51 29 6 47 11 40 0 0 20 31 59 47 171 -37 6 36 8 6 58 15 5 54 45 7 39 32 6 35 51 39 0 0 20 32 12 48 171 -37 6 24 56 6 46 45 5 44 7 7 27 28 6 24 21 38 0 0 20 32 26 49 170 -38 6 13 35 6 35 6 5 33 19 7 15 17 6 12 42 37 0 0 20 32 40 50 170 -38 6 2 5 6 23 19 5 22 19 7 3 0 6 0 54 36 0 0 20 32 54 51 169 -39 5 50 24 6 11 23 5 11 8 6 50 34 5 48 57 35 0 0 20 33 8 52 169 -39 5 38 35 5 59 18 4 59 46 6 38 2 5 36 50 34 0 0 20 33 23 53 169 -39 5 26 35 5 47 5 4 48 13 6 25 22 5 24 35 33 0 0 20 33 38 53 168 -40 5 14 27 5 34 43 4 36 29 6 12 35 5 12 10 32 0 0 20 33 53 54 168 -40 5 2 8 5 22 12 4 24 35 5 59 41 4 59 37 31 0 0 20 34 8 55 167 -40 4 49 41 5 9 32 4 12 30 5 46 38 4 46 53 30 0 0 20 34 23 56 166 -41 4 37 3 4 56 43 4 0 14 5 33 28 4 34 1 29 0 0 20 34 39 57 166 -41 4 24 16 4 43 46 3 47 47 5 20 10 4 20 59 28 0 0 20 34 54 58 165 -41 4 11 20 4 30 39 3 35 10 5 6 43 4 7 48 27 0 0 20 35 10 59 164 -42 3 58 13 4 17 22 3 22 22 4 53 9 3 54 27 26 0 0 20 35 26 60 164 -42 3 44 57 4 3 57 3 9 22 4 39 26 3 40 56 25 0 0 20 35 42 61 163 -42 3 31 31 3 50 22 2 56 13 4 25 35 3 27 16 24 0 0 20 35 58 62 162 -42 3 17 54 3 36 37 2 42 52 4 11 35 3 13 26 23 0 0 20 36 15 63 161 -42 3 4 8 3 22 43 2 29 20 3 57 26 2 59 25 22 0 0 20 36 31 64 160 -42 2 50 11 3 8 39 2 15 37 3 43 8 2 45 15 21 0 0 20 36 48 65 159 -43 2 36 4 2 54 25 2 1 43 3 28 42 2 30 54 20 0 0 20 37 5 65 158 -43 2 21 47 2 40 1 1 47 37 3 14 6 2 16 23 19 0 0 20 37 22 66 156 -43 2 7 18 2 25 27 1 33 20 2 59 20 2 1 41 18 0 0 20 37 39 67 155 -43 1 52 39 2 10 42 1 18 52 2 44 25 1 46 49 17 0 0 20 37 56 68 154 -43 1 37 50 1 55 47 1 4 11 2 29 20 1 31 45 16 0 0 20 38 13 69 152 -43 1 22 48 1 40 41 0 49 19 2 14 5 1 16 30 15 0 0 20 38 30 69 150 -43 1 7 36 1 25 25 0 34 15 1 58 40 1 1 4 14 0 0 20 38 48 70 149 -43 0 52 12 1 9 57 0 18 58 1 43 5 0 45 27 13 0 0 20 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1 0 0 20 43 18 77 99 -40 - 3 24 57 - 3 7 30 - 3 57 37 - 2 34 57 - 3 35 22 - 2 0 0 20 43 36 76 95 -40 - 3 44 6 - 3 26 38 - 4 16 50 - 2 54 1 - 3 54 48 - 3 0 0 20 43 55 76 91 -39 - 4 3 33 - 3 46 3 - 4 36 20 - 3 13 23 - 4 14 32 - 4 0 0 20 44 13 76 87 -39 - 4 23 18 - 4 5 46 - 4 56 9 - 3 33 1 - 4 34 34 - 5 0 0 20 44 31 76 83 -39 - 4 43 22 - 4 25 47 - 5 16 18 - 3 52 58 - 4 54 56 - 6 0 0 20 44 50 75 79 -38 - 5 3 45 - 4 46 7 - 5 36 47 - 4 13 12 - 5 15 38 - 7 0 0 20 45 8 75 76 -38 - 5 24 28 - 5 6 47 - 5 57 37 - 4 33 46 - 5 36 40 - 8 0 0 20 45 26 74 73 -37 - 5 45 33 - 5 27 48 - 6 18 49 - 4 54 40 - 5 58 4 - 9 0 0 20 45 44 74 70 -37 - 6 6 59 - 5 49 9 - 6 40 23 - 5 15 54 - 6 19 50 -10 0 0 20 46 3 73 67 -36 - 6 28 47 - 6 10 53 - 7 2 20 - 5 37 29 - 6 41 59 -11 0 0 20 46 21 72 65 -36 - 6 50 59 - 6 33 0 - 7 24 41 - 5 59 27 - 7 4 33 -12 0 0 20 46 39 72 62 -35 - 7 13 35 - 6 55 31 - 7 47 28 - 6 21 47 - 7 27 31 -13 0 0 20 46 57 71 60 -35 - 7 36 37 - 7 18 26 - 8 10 40 - 6 44 32 - 7 50 56 -14 0 0 20 47 15 70 58 -34 - 8 0 4 - 7 41 48 - 8 34 20 - 7 7 42 - 8 14 48 -15 0 0 20 47 33 69 57 -34 - 8 23 59 - 8 5 36 - 8 58 28 - 7 31 18 - 8 39 8 -16 0 0 20 47 51 68 55 -33 - 8 48 23 - 8 29 53 - 9 23 6 - 7 55 21 - 9 3 57 -17 0 0 20 48 9 68 54 -33 - 9 13 17 - 8 54 38 - 9 48 14 - 8 19 52 - 9 29 18 -18 0 0 20 48 27 67 52 -32 - 9 38 42 - 9 19 55 - 10 13 55 - 8 44 53 - 9 55 11 -19 0 0 20 48 44 66 51 -31 - 10 4 39 - 9 45 44 - 10 40 9 - 9 10 26 - 10 21 39 -20 0 0 20 49 2 65 50 -31 - 10 31 11 - 10 12 6 - 11 6 59 - 9 36 31 - 10 48 41 -21 0 0 20 49 20 64 49 -30 - 10 58 19 - 10 39 4 - 11 34 25 - 10 3 10 - 11 16 21 -22 0 0 20 49 37 63 48 -29 - 11 26 5 - 11 6 39 - 12 2 31 - 10 30 25 - 11 44 41 -23 0 0 20 49 54 62 47 -29 - 11 54 30 - 11 34 52 - 12 31 17 - 10 58 18 - 12 13 41 -24 0 0 20 50 12 61 47 -28 - 12 23 36 - 12 3 47 - 13 0 47 - 11 26 50 - 12 43 25 -25 0 0 20 50 29 60 46 -27 - 12 53 27 - 12 33 25 - 13 31 1 - 11 56 5 - 13 13 55 -26 0 0 20 50 46 59 46 -27 - 13 24 3 - 13 3 48 - 14 2 4 - 12 26 3 Latitude Latitude Latitude Latitude - 15 0 0 -29 17 3 20 51 41 56 44 -24 -28 58 18 -29 35 45 -27 47 52 -30 45 24 - 16 0 0 -31 0 54 20 52 9 54 44 -23 -30 42 40 -31 19 7 -29 34 8 -32 26 56 - 17 0 0 -32 39 36 20 52 36 52 43 -22 -32 21 50 -32 57 20 -31 15 7 -34 3 25 - 18 0 0 -34 13 24 20 53 1 51 43 -21 -33 56 5 -34 30 41 -32 51 4 -35 35 5 - 19 0 0 -35 42 32 20 53 24 49 43 -19 -35 25 39 -35 59 23 -34 22 17 -37 2 11 - 20 0 0 -37 7 14 20 53 46 48 43 -18 -36 50 46 -37 23 41 -35 48 58 -38 24 58 - 21 0 0 -38 27 46 20 54 6 46 43 -17 -38 11 42 -38 43 49 -37 11 23 -39 43 39 - 22 0 0 -39 44 19 20 54 26 45 44 -16 -39 28 38 -40 0 0 -38 29 44 -40 58 27 - 23 0 0 -40 57 7 20 54 43 43 44 -15 -40 41 47 -41 12 26 -39 44 15 -42 9 33 - 24 0 0 -42 6 22 20 55 0 42 44 -14 -41 51 23 -42 21 20 -40 55 8 -43 17 11 - 25 0 0 -43 12 15 20 55 16 41 45 -13 -42 57 35 -43 26 54 -42 2 35 -44 21 31 - 26 0 0 -44 14 56 20 55 31 40 45 -12 -44 0 35 -44 29 16 -43 6 46 -45 22 44 - 27 0 0 -45 14 37 20 55 45 38 45 -11 -45 0 34 -45 28 39 -44 7 53 -46 21 1 - 28 0 0 -46 11 27 20 55 58 37 46 -10 -45 57 41 -46 25 12 -45 6 5 -47 16 30 - 29 0 0 -47 5 35 20 56 10 36 47 -9 -46 52 6 -47 19 4 -46 1 31 -48 9 20 - 30 0 0 -47 57 10 20 56 21 35 47 -8 -47 43 56 -48 10 23 -46 54 21 -48 59 41 - 31 0 0 -48 46 20 20 56 32 34 48 -8 -48 33 21 -48 59 17 -47 44 42 -49 47 40 - 32 0 0 -49 33 12 20 56 43 33 48 -7 -49 20 28 -49 45 55 -48 32 43 -50 33 25 - 33 0 0 -50 17 54 20 56 52 32 49 -6 -50 5 23 -50 30 24 -49 18 31 -51 17 2 - 34 0 0 -51 0 32 20 57 1 31 50 -5 -50 48 15 -51 12 49 -50 2 12 -51 58 38 - 35 0 0 -51 41 14 20 57 10 30 50 -5 -51 29 9 -51 53 18 -50 43 53 -52 38 20 - 36 0 0 -52 20 4 20 57 18 29 51 -4 -52 8 11 -52 31 56 -51 23 40 -53 16 14 - 37 0 0 -52 57 8 20 57 25 29 52 -3 -52 45 27 -53 8 49 -52 1 40 -53 52 24 - 38 0 0 -53 32 32 20 57 33 28 52 -3 -53 21 2 -53 44 2 -52 37 56 -54 26 56 - 39 0 0 -54 6 21 20 57 39 27 53 -2 -53 55 1 -54 17 40 -53 12 35 -54 59 55 - 40 0 0 -54 38 39 20 57 46 26 54 -1 -54 27 29 -54 49 48 -53 45 40 -55 31 25 - 41 0 0 -55 9 30 20 57 52 25 55 -1 -54 58 30 -55 20 29 -54 17 17 -56 1 31 - 42 0 0 -55 38 58 20 57 58 25 55 0 -55 28 8 -55 49 48 -54 47 30 -56 30 16 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 30779321 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 05 47.8177 DE: -03 04 36.901 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .051, .061 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (572) Rebekka approx. diameter [km]: 30 approx. diameter ["]: .035 distance from Earth [AU]: 1.19500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 726 number of rejected observations: 55 time covered by the observations: 1905 Sep 19 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.020, 77° remarks: * orbital elements for (572) Rebekka : Mean anomaly = 332.22912084 deg Arg. of pericenter = 191.76818290 deg Long. of node = 194.64875550 deg Inclination = 10.57108620 deg Eccentricity = 0.15710569 Semimajor axis = 2.40097565 AU Perihelion dist = 2.02376872 AU Mag: H = 10.83, G = 0.15 Epoch of elements : MJD 55105.86300000 TDT (2009 Oct 01.863) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 1 572 Rebekka 20h 43.0m UT 11.5 22 5 47.818- 3 4 36.90UCAC2 30779321 0.0 13.8 30 4.8 1.195 -0.385 -25.13 9.9906 -3.070 -133.37 -3.49 20.7164 -0.22615 0.05201 -0.78815 -3.41681 0.00317 0.00055 2000 330.6758682009 926.00000191.768183194.648756 10.5710860.15710569 2.4009757 2.023768710.9 5.00.15 RATE 2.6492460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.066 0.064 85 2.87 0.065 0 54545.5020091001_779321 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org