IOTA/IOTA-ES occultation update for (856) Backlunda / TYC 0066-00038-1 event on 2009 Sep 09, 02:57 UT Visible from Summary ------- On 2009 Sep 09 UT, the 52 km diameter asteroid (856) Backlunda will occult a 10.3 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 5.3 mag to 15.6 mag (the magnitude of the asteroid) for at most 5.8 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: 68 * date and approx. time of event: 2009 Sep 09, 02:45 - 2009 Sep 09, 02:58 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 5.8 * Moon: 80 % sunlit, 29° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 0.87 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 77° ) * approx speed of asteroid's shadow [km/s]: 8.8949 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0066-00038-1 by 856 Backlunda on 2009 Sep 9 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 43 0 0 13 9 10 2 58 43 70 239 0 12 50 27 13 27 55 12 17 59 14 0 39 42 0 0 13 54 20 2 58 27 71 235 -1 13 35 35 14 13 7 13 3 3 14 45 55 41 0 0 14 39 37 2 58 11 71 231 -2 14 20 50 14 58 27 13 48 14 15 31 19 40 0 0 15 25 0 2 57 55 71 227 -3 15 6 11 15 43 52 14 33 32 16 16 48 39 0 0 16 10 27 2 57 39 72 223 -4 15 51 36 16 29 21 15 18 54 17 2 19 38 0 0 16 55 55 2 57 23 72 219 -5 16 37 3 17 14 50 16 4 18 17 47 51 37 0 0 17 41 23 2 57 7 72 215 -6 17 22 29 18 0 19 16 49 43 18 33 22 36 0 0 18 26 48 2 56 52 72 211 -7 18 7 53 18 45 45 17 35 5 19 18 49 35 0 0 19 12 7 2 56 36 72 207 -8 18 53 12 19 31 5 18 20 22 20 4 11 34 0 0 19 57 20 2 56 20 71 203 -9 19 38 24 20 16 18 19 5 34 20 49 25 33 0 0 20 42 23 2 56 5 71 199 -10 20 23 27 21 1 21 19 50 36 21 34 28 32 0 0 21 27 15 2 55 49 70 195 -10 21 8 19 21 46 13 20 35 29 22 19 20 31 0 0 22 11 54 2 55 34 70 192 -11 21 52 58 22 30 52 21 20 8 23 3 58 30 0 0 22 56 18 2 55 19 69 188 -12 22 37 23 23 15 15 22 4 33 23 48 20 29 0 0 23 40 24 2 55 4 69 185 -13 23 21 30 23 59 21 22 48 42 24 32 24 28 0 0 24 24 12 2 54 49 68 182 -14 24 5 19 24 43 7 23 32 33 25 16 9 27 0 0 25 7 38 2 54 34 67 179 -15 24 48 47 25 26 32 24 16 3 25 59 32 26 0 0 25 50 43 2 54 20 67 177 -15 25 31 53 26 9 35 24 59 12 26 42 32 25 0 0 26 33 23 2 54 5 66 174 -16 26 14 35 26 52 14 25 41 57 27 25 7 24 0 0 27 15 38 2 53 51 65 172 -17 26 56 51 27 34 26 26 24 17 28 7 16 23 0 0 27 57 25 2 53 37 64 170 -17 27 38 41 28 16 12 27 6 11 28 48 57 22 0 0 28 38 45 2 53 24 63 167 -18 28 20 3 28 57 29 27 47 37 29 30 10 21 0 0 29 19 34 2 53 10 63 165 -19 29 0 55 29 38 15 28 28 34 30 10 52 20 0 0 29 59 53 2 52 57 62 164 -20 29 41 17 30 18 31 29 9 0 30 51 3 19 0 0 30 39 39 2 52 44 61 162 -20 30 21 6 30 58 14 29 48 55 31 30 41 18 0 0 31 18 53 2 52 31 60 160 -21 31 0 23 31 37 25 30 28 17 32 9 45 17 0 0 31 57 32 2 52 19 59 159 -21 31 39 5 32 16 1 31 7 5 32 48 15 16 0 0 32 35 36 2 52 7 58 157 -22 32 17 13 32 54 2 31 45 19 33 26 10 15 0 0 33 13 5 2 51 55 57 156 -23 32 54 46 33 31 27 32 22 58 34 3 29 14 0 0 33 49 58 2 51 43 56 154 -23 33 31 42 34 8 16 33 0 1 34 40 11 13 0 0 34 26 14 2 51 31 55 153 -24 34 8 2 34 44 27 33 36 27 35 16 16 12 0 0 35 1 52 2 51 20 54 152 -24 34 43 44 35 20 2 34 12 17 35 51 43 11 0 0 35 36 52 2 51 9 53 150 -25 35 18 49 35 54 58 34 47 28 36 26 32 10 0 0 36 11 14 2 50 58 52 149 -25 35 53 15 36 29 16 35 22 2 37 0 42 9 0 0 36 44 58 2 50 48 52 148 -26 36 27 3 37 2 55 35 55 57 37 34 14 8 0 0 37 18 3 2 50 38 51 147 -26 37 0 12 37 35 55 36 29 14 38 7 7 7 0 0 37 50 28 2 50 28 50 146 -27 37 32 42 38 8 17 37 1 51 38 39 20 6 0 0 38 22 15 2 50 18 49 145 -27 38 4 33 38 39 59 37 33 50 39 10 55 5 0 0 38 53 23 2 50 9 48 144 -27 38 35 45 39 11 2 38 5 10 39 41 50 4 0 0 39 23 51 2 49 59 47 143 -28 39 6 18 39 41 26 38 35 51 40 12 5 3 0 0 39 53 40 2 49 50 46 142 -28 39 36 12 40 11 10 39 5 53 40 41 42 2 0 0 40 22 50 2 49 42 45 141 -28 40 5 27 40 40 16 39 35 15 41 10 40 1 0 0 40 51 22 2 49 33 44 140 -29 40 34 3 41 8 42 40 3 59 41 38 58 0 0 0 41 19 14 2 49 25 44 139 -29 41 2 0 41 36 30 40 32 4 42 6 38 - 1 0 0 41 46 28 2 49 17 43 138 -29 41 29 18 42 3 40 40 59 31 42 33 39 - 2 0 0 42 13 4 2 49 9 42 137 -30 41 55 59 42 30 11 41 26 19 43 0 2 - 3 0 0 42 39 1 2 49 1 41 136 -30 42 22 1 42 56 4 41 52 29 43 25 47 - 4 0 0 43 4 21 2 48 54 40 135 -30 42 47 25 43 21 19 42 18 1 43 50 55 - 5 0 0 43 29 4 2 48 47 39 134 -31 43 12 12 43 45 57 42 42 56 44 15 24 - 6 0 0 43 53 9 2 48 40 38 133 -31 43 36 22 44 9 58 43 7 14 44 39 17 - 7 0 0 44 16 38 2 48 33 38 132 -31 43 59 55 44 33 22 43 30 54 45 2 34 - 8 0 0 44 39 30 2 48 26 37 131 -31 44 22 51 44 56 10 43 53 58 45 25 14 - 9 0 0 45 1 46 2 48 20 36 131 -31 44 45 12 45 18 21 44 16 26 45 47 18 - 10 0 0 45 23 26 2 48 14 35 130 -32 45 6 56 45 39 57 44 38 18 46 8 46 - 11 0 0 45 44 31 2 48 8 35 129 -32 45 28 6 46 0 58 44 59 35 46 29 40 - 12 0 0 46 5 2 2 48 2 34 128 -32 45 48 40 46 21 24 45 20 17 46 49 58 - 13 0 0 46 24 57 2 47 56 33 127 -32 46 8 40 46 41 16 45 40 24 47 9 43 - 14 0 0 46 44 19 2 47 51 32 126 -32 46 28 6 47 0 34 45 59 57 47 28 54 - 15 0 0 47 3 7 2 47 45 31 125 -32 46 46 58 47 19 18 46 18 56 47 47 31 - 16 0 0 47 21 22 2 47 40 31 125 -32 47 5 17 47 37 29 46 37 21 48 5 35 - 17 0 0 47 39 5 2 47 35 30 124 -33 47 23 3 47 55 8 46 55 14 48 23 7 - 18 0 0 47 56 15 2 47 30 29 123 -33 47 40 17 48 12 14 47 12 34 48 40 6 - 19 0 0 48 12 53 2 47 26 29 122 -33 47 56 59 48 28 48 47 29 22 48 56 34 - 20 0 0 48 28 59 2 47 21 28 121 -33 48 13 9 48 44 51 47 45 38 49 12 31 - 21 0 0 48 44 34 2 47 17 27 120 -33 48 28 47 49 0 23 48 1 23 49 27 57 - 22 0 0 48 59 39 2 47 12 26 120 -33 48 43 55 49 15 24 48 16 37 49 42 52 - 23 0 0 49 14 13 2 47 8 26 119 -33 48 58 33 49 29 55 48 31 20 49 57 17 - 24 0 0 49 28 17 2 47 4 25 118 -33 49 12 40 49 43 56 48 45 33 50 11 12 - 25 0 0 49 41 52 2 47 0 24 117 -33 49 26 18 49 57 27 48 59 16 50 24 38 - 26 0 0 49 54 58 2 46 57 24 116 -33 49 39 27 50 10 30 49 12 30 50 37 35 - 27 0 0 50 7 34 2 46 53 23 116 -33 49 52 6 50 23 4 49 25 15 50 50 4 - 28 0 0 50 19 43 2 46 50 22 115 -33 50 4 17 50 35 9 49 37 31 51 2 4 - 29 0 0 50 31 23 2 46 46 22 114 -33 50 16 0 50 46 46 49 49 19 51 13 37 - 30 0 0 50 42 35 2 46 43 21 113 -33 50 27 15 50 57 56 50 0 38 51 24 42 - 31 0 0 50 53 20 2 46 40 20 112 -33 50 38 3 51 8 38 50 11 30 51 35 20 - 32 0 0 51 3 37 2 46 37 20 111 -33 50 48 23 51 18 53 50 21 54 51 45 30 - 33 0 0 51 13 28 2 46 34 19 111 -33 50 58 16 51 28 42 50 31 52 51 55 15 - 34 0 0 51 22 52 2 46 31 18 110 -33 51 7 42 51 38 4 50 41 22 52 4 33 - 35 0 0 51 31 50 2 46 29 18 109 -33 51 16 43 51 47 0 50 50 26 52 13 25 - 36 0 0 51 40 22 2 46 26 17 108 -33 51 25 17 51 55 30 50 59 4 52 21 51 - 37 0 0 51 48 29 2 46 24 16 107 -33 51 33 25 52 3 34 51 7 15 52 29 52 - 38 0 0 51 56 10 2 46 22 16 107 -33 51 41 8 52 11 13 51 15 1 52 37 28 - 39 0 0 52 3 25 2 46 19 15 106 -33 51 48 25 52 18 27 51 22 21 52 44 39 - 40 0 0 52 10 16 2 46 17 15 105 -33 51 55 17 52 25 16 51 29 17 52 51 25 - 41 0 0 52 16 42 2 46 15 14 104 -33 52 1 45 52 31 40 51 35 47 52 57 46 - 42 0 0 52 22 43 2 46 13 13 103 -32 52 7 47 52 37 40 51 41 52 53 3 43 - 43 0 0 52 28 20 2 46 11 13 103 -32 52 13 25 52 43 15 51 47 32 53 9 16 - 44 0 0 52 33 32 2 46 10 12 102 -32 52 18 39 52 48 27 51 52 48 53 14 26 - 45 0 0 52 38 21 2 46 8 11 101 -32 52 23 29 52 53 14 51 57 40 53 19 11 - 46 0 0 52 42 46 2 46 6 11 100 -32 52 27 55 52 57 38 52 2 8 53 23 33 - 47 0 0 52 46 47 2 46 5 10 99 -32 52 31 57 53 1 38 52 6 12 53 27 31 - 48 0 0 52 50 24 2 46 4 10 99 -32 52 35 35 53 5 14 52 9 51 53 31 6 - 49 0 0 52 53 38 2 46 2 9 98 -32 52 38 50 53 8 28 52 13 7 53 34 18 - 50 0 0 52 56 29 2 46 1 8 97 -31 52 41 41 53 11 18 52 16 0 53 37 7 - 51 0 0 52 58 56 2 46 0 8 96 -31 52 44 9 53 13 45 52 18 29 53 39 33 - 52 0 0 53 1 1 2 45 59 7 95 -31 52 46 14 53 15 49 52 20 34 53 41 36 - 53 0 0 53 2 42 2 45 58 7 95 -31 52 47 56 53 17 30 52 22 17 53 43 17 - 54 0 0 53 4 0 2 45 57 6 94 -31 52 49 14 53 18 48 52 23 36 53 44 34 - 55 0 0 53 4 56 2 45 56 5 93 -31 52 50 10 53 19 43 52 24 32 53 45 29 - 56 0 0 53 5 28 2 45 56 5 92 -31 52 50 43 53 20 15 52 25 4 53 46 2 - 57 0 0 53 5 38 2 45 55 4 91 -30 52 50 52 53 20 25 52 25 14 53 46 12 - 58 0 0 53 5 25 2 45 54 4 91 -30 52 50 39 53 20 12 52 25 0 53 45 59 - 59 0 0 53 4 49 2 45 54 3 90 -30 52 50 3 53 19 37 52 24 24 53 45 24 - 60 0 0 53 3 51 2 45 54 2 89 -30 52 49 4 53 18 38 52 23 24 53 44 26 - 61 0 0 53 2 29 2 45 53 2 88 -30 52 47 42 53 17 17 52 22 2 53 43 6 - 62 0 0 53 0 45 2 45 53 1 87 -29 52 45 58 53 15 34 52 20 16 53 41 23 - 63 0 0 52 58 38 2 45 53 0 87 -29 52 43 50 53 13 27 52 18 7 53 39 18 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0066-00038-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 56 23.7652 DE: +02 27 58.271 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 10.3 * B mag [mag]: 11.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (856) Backlunda approx. diameter [km]: 52 approx. diameter ["]: .032 distance from Earth [AU]: 2.22300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 666 number of rejected observations: 53 time covered by the observations: 1931 Feb 28 - 2007 Jun 07 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 67° remarks: * orbital elements for (856) Backlunda : Mean anomaly = 201.40377398 deg Arg. of pericenter = 73.53992329 deg Long. of node = 125.60573136 deg Inclination = 14.31739367 deg Eccentricity = 0.11969331 Semimajor axis = 2.43455626 AU Perihelion dist = 2.14315616 AU Mag: H = 10.63, G = 0.15 Epoch of elements : MJD 55083.12300000 TDT (2009 Sep 09.123) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 9 856 Backlunda 2h 57.2m UT 10.3 3 56 23.765 2 27 58.27TYC 0066-00038-1 11.0 15.6 52 5.8 2.223 1.090 -11.29 26.4973 2.470 135.05 5.30 2.9535 0.17713 0.25669 4.13132 -2.85270 -0.00531 -0.00061 2000 200.5934732009 9 6.00000 73.539923125.605731 14.3173940.11969331 2.4345563 2.143156210.7 5.00.15 RATE 2.5946240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.025 77 1.87 0.028 0 54545.5020090909_0038-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 13:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org