IOTA/IOTA-ES occultation update for (976) Benjamina / UCAC2 26787855 event on 2009 May 10, 20:00 UT Visible from Summary ------- On 2009 May 10 UT, the 81 km diameter asteroid (976) Benjamina will occult a 11.9 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.8 mag (the magnitude of the asteroid) for at most 10.5 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: 39 * date and approx. time of event: 2009 May 10, 19:53 - 2009 May 10, 20:08 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 10.5 * Moon: 97 % sunlit, 53° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 147 * 1 sigma uncertainty interval [path widths]: +/- 1.71 * 1 sigma uncertainty interval [seconds]: +/- 17.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .071 +/- .069) * 1 sigma uncertainty ellipse (major, minor, PA): ( .071", .069", 89° ) * approx speed of asteroid's shadow [km/s]: 7.6438 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26787855 by 976 Benjamina on 2009 May 10 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 103 39 32 65 0 0 20 8 14 8 152 0 105 14 6 102 2 27 ... .. .. 96 6 50 104 15 55 64 0 0 20 8 10 9 153 -1 105 46 16 102 43 21 110 40 59 97 5 56 104 46 6 63 0 0 20 8 6 10 153 -1 106 12 40 103 17 30 110 55 48 97 55 57 105 10 48 62 0 0 20 8 1 11 153 -2 106 34 1 103 45 45 111 6 43 98 38 8 105 30 41 61 0 0 20 7 56 12 154 -2 106 50 52 104 8 48 111 14 8 99 13 31 105 46 14 60 0 0 20 7 50 13 154 -3 107 3 41 104 27 12 111 18 24 99 42 55 105 57 54 59 0 0 20 7 44 14 154 -4 107 12 53 104 41 27 111 19 48 100 7 1 106 6 3 58 0 0 20 7 37 15 154 -4 107 18 48 104 51 57 111 18 36 100 26 23 106 11 1 57 0 0 20 7 30 16 154 -5 107 21 43 104 59 2 111 15 0 100 41 28 106 13 3 56 0 0 20 7 23 17 154 -6 107 21 53 105 3 0 111 9 11 100 52 42 106 12 24 55 0 0 20 7 15 18 153 -6 107 19 31 105 4 6 111 1 20 101 0 23 106 9 14 54 0 0 20 7 7 18 153 -7 107 14 47 105 2 34 110 51 34 101 4 50 106 3 45 53 0 0 20 6 58 19 153 -8 107 7 52 104 58 33 110 40 1 101 6 16 105 56 5 52 0 0 20 6 49 20 153 -9 106 58 53 104 52 14 110 26 46 101 4 55 105 46 21 51 0 0 20 6 40 21 152 -9 106 47 58 104 43 45 110 11 55 101 0 57 105 34 42 50 0 0 20 6 30 22 152 -10 106 35 12 104 33 13 109 55 34 100 54 32 105 21 11 49 0 0 20 6 20 23 151 -11 106 20 41 104 20 44 109 37 44 100 45 47 105 5 54 48 0 0 20 6 10 23 151 -12 106 4 29 104 6 23 109 18 31 100 34 49 104 48 55 47 0 0 20 5 59 24 150 -13 105 46 39 103 50 15 108 57 56 100 21 44 104 30 17 46 0 0 20 5 48 25 150 -14 105 27 16 103 32 23 108 36 1 100 6 36 104 10 3 45 0 0 20 5 36 26 149 -14 105 6 21 103 12 51 108 12 50 99 49 30 103 48 15 44 0 0 20 5 24 26 148 -15 104 43 56 102 51 39 107 48 22 99 30 28 103 24 54 43 0 0 20 5 11 27 148 -16 104 20 3 102 28 52 107 22 40 99 9 34 103 0 3 42 0 0 20 4 59 28 147 -17 103 54 43 102 4 28 106 55 43 98 46 47 102 33 40 41 0 0 20 4 45 28 146 -18 103 27 57 101 38 30 106 27 31 98 22 11 102 5 48 40 0 0 20 4 32 29 145 -19 102 59 43 101 10 58 105 58 6 97 55 44 101 36 24 39 0 0 20 4 18 29 145 -20 102 30 3 100 41 50 105 27 26 97 27 26 101 5 29 38 0 0 20 4 3 30 144 -21 101 58 55 100 11 7 104 55 30 96 57 18 100 33 1 37 0 0 20 3 49 30 143 -22 101 26 19 99 38 47 104 22 17 96 25 16 99 58 58 36 0 0 20 3 34 31 142 -23 100 52 11 99 4 48 103 47 46 95 51 19 99 23 19 35 0 0 20 3 18 31 141 -24 100 16 31 98 29 8 103 11 54 95 15 24 98 45 59 34 0 0 20 3 2 32 140 -26 99 39 15 97 51 43 102 34 40 94 37 26 98 6 56 33 0 0 20 2 46 32 139 -27 99 0 20 97 12 30 101 56 0 93 57 21 97 26 5 32 0 0 20 2 29 32 138 -28 98 19 42 96 31 25 101 15 52 93 15 3 96 43 22 31 0 0 20 2 12 33 136 -29 97 37 17 95 48 21 100 34 11 92 30 25 95 58 41 30 0 0 20 1 54 33 135 -30 96 52 58 95 3 13 99 50 53 91 43 17 95 11 54 29 0 0 20 1 36 33 134 -31 96 6 41 94 15 54 99 5 54 90 53 31 94 22 54 28 0 0 20 1 18 33 133 -33 95 18 16 93 26 14 98 19 6 90 0 54 93 31 31 27 0 0 20 0 59 33 131 -34 94 27 37 92 34 3 97 30 24 89 5 10 92 37 35 26 0 0 20 0 40 33 130 -35 93 34 32 91 39 10 96 39 40 88 6 2 91 40 52 25 0 0 20 0 20 33 129 -37 92 38 50 90 41 19 95 46 44 87 3 9 90 41 7 24 0 0 20 0 0 33 127 -38 91 40 16 89 40 13 94 51 28 85 56 2 89 38 0 23 0 0 19 59 39 33 126 -40 90 38 35 88 35 31 93 53 37 84 44 7 88 31 9 22 0 0 19 59 17 32 125 -41 89 33 24 87 26 47 92 52 59 83 26 39 87 20 6 21 0 0 19 58 56 32 123 -43 88 24 21 86 13 28 91 49 17 82 2 40 86 4 15 20 0 0 19 58 33 32 122 -44 87 10 54 84 54 53 90 42 10 80 30 47 84 42 51 19 0 0 19 58 10 31 120 -46 85 52 23 83 30 8 89 31 13 78 49 4 83 14 52 18 0 0 19 57 46 30 119 -47 84 27 59 81 57 58 88 15 56 76 54 32 81 38 57 17 0 0 19 57 21 29 118 -49 82 56 35 80 16 40 86 55 41 74 42 10 79 53 8 16 0 0 19 56 55 28 116 -51 81 16 36 78 23 40 85 29 38 72 2 13 77 54 24 15 0 0 19 56 27 27 115 -53 79 25 47 76 14 50 83 56 42 68 29 38 75 37 47 14 0 0 19 55 58 25 113 -55 77 20 36 73 42 40 82 15 23 ... .. .. Latitude Latitude Latitude Latitude 74 0 0 13 22 42 19 55 39 24 112 -56 12 40 2 14 6 16 10 20 3 16 42 53 73 0 0 13 2 4 19 55 28 23 112 -57 12 19 47 13 45 12 10 1 0 16 20 9 72 0 0 12 43 5 19 55 17 22 111 -57 12 1 10 13 25 50 9 43 30 15 59 16 71 0 0 12 25 44 19 55 7 21 111 -58 11 44 9 13 8 8 9 27 29 15 40 10 70 0 0 12 10 0 19 54 57 20 110 -59 11 28 43 12 52 4 9 12 58 15 22 51 69 0 0 11 55 49 19 54 48 19 110 -59 11 14 49 12 37 37 8 59 54 15 7 15 68 0 0 11 43 12 19 54 39 18 109 -60 11 2 27 12 24 44 8 48 17 14 53 21 67 0 0 11 32 6 19 54 31 18 109 -60 10 51 34 12 13 24 8 38 4 14 41 6 66 0 0 11 22 31 19 54 23 17 109 -60 10 42 10 12 3 36 8 29 16 14 30 30 65 0 0 11 14 24 19 54 15 16 108 -61 10 34 14 11 55 19 8 21 51 14 21 31 64 0 0 11 7 46 19 54 8 15 108 -61 10 27 44 11 48 31 8 15 49 14 14 7 63 0 0 11 2 35 19 54 1 14 108 -61 10 22 41 11 43 12 8 11 8 14 8 17 62 0 0 10 58 50 19 53 55 13 107 -61 10 19 2 11 39 21 8 7 47 14 4 1 61 0 0 10 56 31 19 53 50 12 107 -61 10 16 48 11 36 57 8 5 47 14 1 18 60 0 0 10 55 37 19 53 44 11 107 -61 10 15 57 11 36 0 8 5 7 14 0 6 59 0 0 10 56 8 19 53 39 10 107 -61 10 16 30 11 36 28 8 5 46 14 0 25 58 0 0 10 58 2 19 53 35 9 106 -61 10 18 25 11 38 21 .. .. .. 14 2 15 57 0 0 11 1 20 19 53 31 8 106 -61 10 21 43 11 41 40 .. .. .. 14 5 35 56 0 0 11 6 2 19 53 28 7 106 -61 10 26 23 11 46 24 .. .. .. 14 10 25 55 0 0 11 12 7 19 53 25 6 106 -60 10 32 26 11 52 32 .. .. .. 14 16 45 54 0 0 11 19 36 19 53 22 5 106 -60 10 39 50 12 0 5 .. .. .. 14 24 35 53 0 0 11 28 27 19 53 20 4 105 -60 10 48 36 12 9 2 .. .. .. 14 33 54 52 0 0 11 38 42 19 53 18 3 105 -59 10 58 44 12 19 24 .. .. .. 14 44 44 51 0 0 11 50 21 19 53 17 2 105 -59 11 10 15 12 31 11 .. .. .. 14 57 3 50 0 0 12 3 23 19 53 16 1 105 -58 11 23 8 12 44 23 .. .. .. 15 10 54 49 0 0 12 17 49 19 53 16 0 105 -58 11 37 23 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 18 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 26787855 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 10 33.3251 DE: -14 13 39.774 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .068, .068 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (976) Benjamina approx. diameter [km]: 81 approx. diameter ["]: .041 distance from Earth [AU]: 2.69700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 894 number of rejected observations: 59 time covered by the observations: 1929 Jul 06 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.011, 73° remarks: * orbital elements for (976) Benjamina : Mean anomaly = 76.20858341 deg Arg. of pericenter = 312.34181444 deg Long. of node = 244.81441641 deg Inclination = 7.65034722 deg Eccentricity = 0.09563426 Semimajor axis = 3.20767378 AU Perihelion dist = 2.90091029 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 54961.83400000 TDT (2009 May 10.834) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 10 976 Benjamina 20h 0.9m UT 11.9 20 10 33.325-14 13 39.77UCAC2 26787855 0.0 14.8 81 10.5 2.697 0.695 9.77 133.6628 -14.230 -121.13 17.82 20.0151 -0.58017 0.60052 3.10404 2.99645 -0.00523 -0.00133 2000 75.8939402009 5 9.00000312.341814244.814416 7.6503470.09563426 3.2076738 2.9009103 9.2 5.00.15 RATE 1.7156110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.071 0.069 89 2.71 0.071 0 54545.5020090510_787855 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org