IOTA/IOTA-ES occultation update for (980) Anacostia / UCAC2 42172760 event on 2012 Nov 08, 23:08 UT Visible from Brazil, Argentina Summary ------- On 2012 Nov 08 UT, the 78 km diameter asteroid (980) Anacostia will occult a 11.7 mag star in the constellation Andromeda for observers along a path across Brazil, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 11.3 mag (the magnitude of the asteroid) for at most 10.2 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: 95 * date and approx. time of event: 2012 Nov 08, 22:55 - 2012 Nov 08, 23:20 UT * geocentric midpoint of event [JD]: 2456240.46406667 * magnitude of target star: 11.7 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 10.2 * Moon: 30 % sunlit, 140° distance * Sun: 141° distance * rough path description: Brazil, Argentina The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .025", 73° ) * approx speed of asteroid's shadow [km/s]: 7.6537 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 42172760 by 980 Anacostia on 2012 Nov 8 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude -176 13 45 73 44 13 22 55 33 16 29 -1 -176 38 11 74 13 50 -175 52 21 73 13 42 -177 1 42 74 38 38 -175 36 19 72 46 42 -165 30 3 77 4 35 22 55 53 20 39 -4 -165 47 46 77 31 36 -165 15 9 76 37 5 -166 5 25 77 54 27 -165 4 28 76 13 2 -151 48 58 79 15 24 22 56 13 23 52 -6 -151 44 42 79 41 9 -151 54 43 78 49 21 -151 42 20 80 3 6 -152 0 48 78 26 44 -135 28 34 80 25 3 22 56 33 26 68 -9 -134 47 31 80 49 0 -136 8 17 80 0 53 -134 11 1 81 9 26 -136 41 31 79 39 56 -118 30 12 80 37 49 22 56 53 29 85 -11 -117 12 25 80 58 39 -119 44 16 80 16 41 -116 2 12 81 16 19 -120 45 14 79 58 16 -103 29 25 80 4 18 22 57 13 32 99 -12 -101 51 19 80 21 19 -105 3 34 79 46 51 -100 23 34 80 35 37 -106 21 32 79 31 32 - 91 40 9 78 59 32 22 57 33 34 111 -14 - 89 58 17 79 13 1 - 93 19 3 78 45 34 - 88 28 15 79 24 14 - 94 41 49 78 33 13 - 82 50 0 77 36 28 22 57 53 36 119 -16 - 81 12 58 77 47 7 - 84 25 8 77 25 21 - 79 48 0 77 55 55 - 85 45 26 77 15 26 - 76 16 53 76 3 37 22 58 13 38 125 -17 - 74 47 27 76 12 7 - 77 45 9 75 54 41 - 73 29 38 76 19 5 - 79 0 8 75 46 40 - 71 21 42 74 25 54 22 58 33 40 129 -18 - 70 0 2 74 32 47 - 72 42 41 74 18 38 - 68 49 16 74 38 24 - 73 51 45 74 12 5 - 67 35 46 72 46 8 22 58 53 42 133 -19 - 66 21 7 72 51 47 - 68 49 59 72 40 7 - 65 16 38 72 56 23 - 69 53 29 72 34 41 - 64 39 20 71 5 49 22 59 13 44 135 -21 - 63 30 48 71 10 33 - 65 47 37 71 0 47 - 62 31 42 71 14 21 - 66 46 9 70 56 13 - 62 19 1 69 25 50 22 59 34 46 137 -22 - 61 15 43 69 29 49 - 63 22 11 69 21 34 - 60 21 12 69 33 2 - 64 16 23 69 17 41 - 60 25 38 67 46 38 22 59 54 48 138 -23 - 59 26 49 67 50 3 - 61 24 23 67 42 59 - 58 36 12 67 52 46 - 62 14 52 67 39 38 - 58 52 46 66 8 29 23 0 14 49 139 -24 - 57 57 48 66 11 25 - 59 47 43 66 5 19 - 57 10 31 66 13 45 - 60 34 57 66 2 24 - 57 35 49 64 31 27 23 0 34 51 139 -24 - 56 44 10 64 34 0 - 58 27 29 64 28 42 - 55 59 46 64 36 2 - 59 11 54 64 26 9 - 56 31 28 62 55 37 23 0 54 53 139 -25 - 55 42 42 62 57 51 - 57 20 15 62 53 11 - 55 0 48 62 59 37 - 58 2 14 62 50 56 - 55 37 13 61 20 57 23 1 14 54 139 -26 - 54 50 59 61 22 56 - 56 23 29 61 18 48 - 54 11 16 61 24 29 - 57 3 19 61 16 48 - 54 51 13 59 47 26 23 1 34 55 139 -27 - 54 7 12 59 49 11 - 55 35 16 59 45 31 - 53 29 24 59 50 33 - 56 13 11 59 43 44 - 54 12 0 58 15 0 23 1 54 57 139 -28 - 53 29 58 58 16 33 - 54 54 5 58 13 16 - 52 53 52 58 17 46 - 55 30 19 58 11 40 - 53 38 29 56 43 35 23 2 14 58 138 -28 - 52 58 12 56 44 59 - 54 18 48 56 42 2 - 52 23 37 56 46 4 - 54 53 31 56 40 35 - 53 9 44 55 13 8 23 2 34 60 137 -29 - 52 31 3 55 14 24 - 53 48 29 55 11 44 - 51 57 49 55 15 22 - 54 21 51 55 10 24 - 52 45 5 53 43 35 23 2 54 61 136 -29 - 52 7 49 53 44 44 - 53 22 25 53 42 18 - 51 35 49 53 45 36 - 53 54 34 53 41 6 - 52 23 57 52 14 52 23 3 14 62 135 -30 - 51 47 58 52 15 54 - 53 0 0 52 13 42 - 51 17 4 52 16 42 - 53 31 2 52 12 35 - 52 5 52 50 46 54 23 3 34 63 133 -30 - 51 31 2 50 47 51 - 52 40 44 50 45 50 - 51 1 9 50 48 34 - 53 10 46 50 44 49 - 51 50 26 49 19 39 23 3 54 64 132 -31 - 51 16 41 49 20 32 - 52 24 15 49 18 40 - 50 47 41 49 21 11 - 52 53 22 49 17 43 - 51 37 21 47 53 3 23 4 15 66 130 -31 - 51 4 34 47 53 51 - 52 10 11 47 52 8 - 50 36 25 47 54 27 - 52 38 28 47 51 15 - 51 26 20 46 27 1 23 4 35 67 128 -32 - 50 54 27 46 27 46 - 51 58 17 46 26 10 - 50 27 3 46 28 19 - 52 25 48 46 25 20 - 51 17 11 45 1 31 23 4 55 68 126 -32 - 50 46 6 45 2 12 - 51 48 18 45 0 43 - 50 19 25 45 2 43 - 52 15 7 44 59 56 - 51 9 41 43 36 29 23 5 15 68 123 -33 - 50 39 22 43 37 8 - 51 40 3 43 35 44 - 50 13 20 43 37 36 - 52 6 13 43 35 0 - 51 3 41 42 11 52 23 5 35 69 120 -33 - 50 34 4 42 12 28 - 51 33 22 42 11 9 - 50 8 38 42 12 55 - 51 58 55 42 10 28 - 50 59 4 40 47 36 23 5 55 70 117 -33 - 50 30 5 40 48 11 - 51 28 5 40 46 56 - 50 5 12 40 48 36 - 51 53 6 40 46 16 - 50 55 41 39 23 40 23 6 15 71 114 -33 - 50 27 18 39 24 12 - 51 24 7 39 23 1 - 50 2 56 39 24 36 - 51 48 36 39 22 23 - 50 53 26 37 59 58 23 6 35 71 110 -34 - 50 25 37 38 0 30 - 51 21 19 37 59 22 - 50 1 43 38 0 52 - 51 45 20 37 58 45 - 50 52 16 36 36 30 23 6 55 72 106 -34 - 50 24 57 36 37 0 - 51 19 37 36 35 55 - 50 1 30 36 37 22 - 51 43 11 36 35 20 - 50 52 4 35 13 12 23 7 15 72 102 -34 - 50 25 13 35 13 41 - 51 18 56 35 12 37 - 50 2 11 35 14 1 - 51 42 6 35 12 3 - 50 52 47 33 50 0 23 7 35 73 98 -34 - 50 26 23 33 50 28 - 51 19 13 33 49 27 - 50 3 44 33 50 48 - 51 41 59 33 48 54 - 50 54 21 32 26 53 23 7 55 73 93 -34 - 50 28 23 32 27 20 - 51 20 23 32 26 20 - 50 6 5 32 27 40 - 51 42 48 32 25 48 - 50 56 45 31 3 46 23 8 15 73 89 -34 - 50 31 10 31 4 13 - 51 22 23 31 3 14 - 50 9 11 31 4 33 - 51 44 29 31 2 43 - 50 59 55 29 40 39 23 8 35 73 84 -34 - 50 34 41 29 41 5 - 51 25 12 29 40 7 - 50 13 1 29 41 24 - 51 46 59 29 39 36 - 51 3 50 28 17 27 23 8 56 73 80 -34 - 50 38 55 28 17 53 - 51 28 46 28 16 55 - 50 17 33 28 18 12 - 51 50 16 28 16 24 - 51 8 27 26 54 7 23 9 16 72 75 -34 - 50 43 51 26 54 34 - 51 33 5 26 53 36 - 50 22 44 26 54 52 - 51 54 18 26 53 5 - 51 13 45 25 30 37 23 9 36 72 71 -34 - 50 49 26 25 31 4 - 51 38 6 25 30 6 - 50 28 34 25 31 23 - 51 59 4 25 29 35 - 51 19 43 24 6 54 23 9 56 72 67 -34 - 50 55 40 24 7 21 - 51 43 48 24 6 22 - 50 35 2 24 7 41 - 52 4 33 24 5 51 - 51 26 20 22 42 55 23 10 16 71 64 -34 - 51 2 32 22 43 22 - 51 50 10 22 42 23 - 50 42 6 22 43 42 - 52 10 43 22 41 51 - 51 33 36 21 18 36 23 10 36 70 60 -34 - 51 10 1 21 19 4 - 51 57 13 21 18 3 - 50 49 47 21 19 24 - 52 17 33 21 17 31 - 51 41 30 19 53 54 23 10 56 70 57 -33 - 51 18 8 19 54 23 - 52 4 54 19 53 21 - 50 58 4 19 54 44 - 52 25 4 19 52 48 - 51 50 1 18 28 46 23 11 16 69 54 -33 - 51 26 51 18 29 16 - 52 13 15 18 28 12 - 51 6 57 18 29 38 - 52 33 15 18 27 38 - 51 59 11 17 3 9 23 11 36 68 51 -33 - 51 36 11 17 3 39 - 52 22 14 17 2 33 - 51 16 26 17 4 2 - 52 42 6 17 1 59 - 52 9 0 15 36 57 23 11 56 67 49 -32 - 51 46 8 15 37 29 - 52 31 53 15 36 20 - 51 26 31 15 37 53 - 52 51 37 15 35 45 - 52 19 27 14 10 8 23 12 16 66 46 -32 - 51 56 44 14 10 41 - 52 42 12 14 9 30 - 51 37 14 14 11 6 - 53 1 49 14 8 53 - 52 30 34 12 42 37 23 12 36 65 44 -32 - 52 7 58 12 43 12 - 52 53 12 12 41 57 - 51 48 34 12 43 38 - 53 12 43 12 41 19 - 52 42 22 11 14 19 23 12 56 64 42 -31 - 52 19 52 11 14 56 - 53 4 54 11 13 38 - 52 0 34 11 15 24 - 53 24 19 11 12 58 - 52 54 52 9 45 10 23 13 16 62 40 -31 - 52 32 27 9 45 49 - 53 17 19 9 44 27 - 52 13 13 9 46 19 - 53 36 40 9 43 45 - 53 8 6 8 15 5 23 13 36 61 39 -30 - 52 45 46 8 15 46 - 53 30 29 8 14 19 - 52 26 35 8 16 17 - 53 49 47 8 13 35 - 53 22 6 6 43 57 23 13 57 60 37 -30 - 52 59 49 6 44 40 - 53 44 27 6 43 8 - 52 40 42 6 45 14 - 54 3 42 6 42 22 - 53 36 56 5 11 40 23 14 17 59 36 -29 - 53 14 40 5 12 26 - 53 59 14 5 10 48 - 52 55 34 5 13 2 - 54 18 27 5 10 0 - 53 52 36 3 38 7 23 14 37 57 35 -29 - 53 30 22 3 38 56 - 54 14 54 3 37 12 - 53 11 17 3 39 35 - 54 34 7 3 36 21 - 54 9 12 2 3 11 23 14 57 56 34 -28 - 53 46 57 2 4 4 - 54 31 30 2 2 13 - 53 27 52 2 4 45 - 54 50 44 2 1 18 - 54 26 48 0 26 43 23 15 17 54 33 -27 - 54 4 31 0 27 40 - 54 49 7 0 25 41 - 53 45 25 0 28 24 - 55 8 22 0 24 43 - 54 45 28 - 1 11 27 23 15 37 53 32 -26 - 54 23 8 - 1 10 26 - 55 7 50 - 1 12 34 - 54 3 59 - 1 9 38 - 55 27 8 - 1 13 36 - 55 5 18 - 2 51 30 23 15 57 51 31 -26 - 54 42 54 - 2 50 24 - 55 27 45 - 2 52 41 - 54 23 41 - 2 49 31 - 55 47 7 - 2 53 48 - 55 26 26 - 4 33 37 23 16 17 50 30 -25 - 55 3 56 - 4 32 26 - 55 48 59 - 4 34 55 - 54 44 38 - 4 31 29 - 56 8 27 - 4 36 6 - 55 49 0 - 6 18 4 23 16 37 48 30 -24 - 55 26 22 - 6 16 47 - 56 11 42 - 6 19 28 - 55 6 58 - 6 15 44 - 56 31 16 - 6 20 45 - 56 13 10 - 8 5 8 23 16 57 46 29 -23 - 55 50 23 - 8 3 43 - 56 36 2 - 8 6 39 - 55 30 50 - 8 2 35 - 56 55 46 - 8 8 3 - 56 39 10 - 9 55 8 23 17 17 45 28 -22 - 56 16 11 - 9 53 35 - 57 2 15 - 9 56 48 - 55 56 28 - 9 52 20 - 57 22 9 - 9 58 19 - 57 7 15 -11 48 28 23 17 37 43 28 -21 - 56 44 1 -11 46 45 - 57 30 35 -11 50 17 - 56 24 5 -11 45 22 - 57 50 43 -11 51 57 - 57 37 45 -13 45 36 23 17 57 41 28 -20 - 57 14 13 -13 43 42 - 58 1 23 -13 47 37 - 56 54 2 -13 42 10 - 58 21 48 -13 49 27 - 58 11 6 -15 47 8 23 18 17 39 27 -18 - 57 47 11 -15 45 1 - 58 35 6 -15 49 23 - 57 26 42 -15 43 17 - 58 55 50 -15 51 26 - 58 47 49 -17 53 49 23 18 38 37 27 -17 - 58 23 28 -17 51 26 - 59 12 18 -17 56 21 - 58 2 36 -17 49 29 - 59 33 26 -17 58 38 - 59 28 41 -20 6 36 23 18 58 35 27 -16 - 59 3 47 -20 3 53 - 59 53 44 -20 9 29 - 58 42 28 -20 1 40 - 60 15 22 -20 12 4 - 60 14 43 -22 26 47 23 19 18 32 27 -14 - 59 49 8 -22 23 39 - 60 40 28 -22 30 5 - 59 27 14 -22 21 5 - 61 2 44 -22 33 4 - 61 7 24 -24 56 7 23 19 38 30 27 -12 - 60 40 55 -24 52 27 - 61 34 3 -24 59 59 - 60 18 18 -24 49 26 - 61 57 7 -25 3 28 - 62 8 58 -27 37 12 23 19 58 27 27 -11 - 61 41 20 -27 32 48 - 62 36 49 -27 41 50 - 61 17 45 -27 29 12 - 63 0 58 -27 46 1 - 63 23 8 -30 34 7 23 20 18 24 27 -8 - 62 53 54 -30 28 39 - 63 52 40 -30 39 51 - 62 28 59 -30 24 11 - 64 18 19 -30 45 2 - 64 56 39 -33 53 55 23 20 38 20 28 -6 - 64 24 59 -33 46 48 - 65 28 46 -34 1 26 - 63 58 4 -33 40 59 - 65 56 44 -34 8 13 - 67 4 22 -37 51 23 23 20 58 16 29 -3 - 66 28 22 -37 41 8 - 67 41 8 -38 2 18 - 65 57 57 -37 32 48 - 68 13 26 -38 12 15 Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: UCAC2 42172760 * constellation : Andromeda * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 16 05.8212 DE: +29 42 51.058 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .020 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (980) Anacostia approx. diameter [km]: 78 approx. diameter ["]: .077 distance from Earth [AU]: 1.39500 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 714 number of rejected observations: 94 time covered by the observations: 1929 Apr 15 - 2012 Oct 06 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.015, 62° remarks: * orbital elements for (980) Anacostia : Mean anomaly = 21.91334959 deg Arg. of pericenter = 70.36406616 deg Long. of node = 285.85151572 deg Inclination = 15.89883456 deg Eccentricity = 0.20004642 Semimajor axis = 2.74159471 AU Perihelion dist = 2.19314851 AU Mag: H = 7.73, G = 0.06 Epoch of elements : MJD 56239.96400000 TDT (2012 Nov 08.964) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 8 980 Anacostia 23h 8.3m UT 11.7 0 16 5.821 29 42 51.06UCAC2 42172760 0.0 11.3 78 10.2 1.395 -0.313 -26.91 -31.5750 29.722 -171.11 -16.90 23.1376 -0.28686 0.04378 -0.65099 -4.27064 0.00346 -0.00064 2000 19.74996920121030.00000 70.364066285.851516 15.8988350.20004642 2.7415947 2.1931485 7.9 5.00.06 RATE 2.1711970 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.025 73 1.43 0.033 0 0 2-2 056226.0020121108_172760 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org