IOTA/IOTA-ES occultation update for (487) Venetia / TYC 0080-01182-1 event on 2012 Oct 28, 09:27 UT Visible from Venezuela, Colombia, Central America Summary ------- On 2012 Oct 28 UT, the 66 km diameter asteroid (487) Venetia will occult a 9.8 mag star in the constellation Taurus for observers along a path across Venezuela, Colombia, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 11.7 mag (the magnitude of the asteroid) for at most 8.7 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: 96 * date and approx. time of event: 2012 Oct 28, 09:15 - 2012 Oct 28, 09:41 UT * geocentric midpoint of event [JD]: 2456228.894275 * magnitude of target star: 9.8 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 8.7 * Moon: 98 % sunlit, 47° distance * Sun: 149° distance * rough path description: Venezuela, Colombia, Central America The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .025", 80° ) * approx speed of asteroid's shadow [km/s]: 7.6190 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0080-01182-1 by 487 Venetia on 2012 Oct 28 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 154 0 0 -23 32 49 9 41 36 1 83 -24 -23 14 40 -23 50 59 -22 59 26 -24 6 15 155 0 0 -23 25 58 9 41 35 2 83 -24 -23 7 48 -23 44 8 -22 52 33 -23 59 25 156 0 0 -23 18 49 9 41 35 2 82 -25 -23 0 38 -23 37 0 -22 45 23 -23 52 18 157 0 0 -23 11 24 9 41 34 3 82 -26 -22 53 12 -23 29 36 -22 37 56 -23 44 54 158 0 0 -23 3 42 9 41 33 4 81 -27 -22 45 30 -23 21 55 -22 30 13 -23 37 13 159 0 0 -22 55 44 9 41 32 5 81 -28 -22 37 31 -23 13 58 -22 22 14 -23 29 17 160 0 0 -22 47 30 9 41 31 6 81 -29 -22 29 16 -23 5 44 -22 13 58 -23 21 4 161 0 0 -22 38 59 9 41 29 7 80 -30 -22 20 45 -22 57 14 -22 5 26 -23 12 35 162 0 0 -22 30 13 9 41 28 8 80 -31 -22 11 57 -22 48 29 -21 56 38 -23 3 50 163 0 0 -22 21 10 9 41 26 9 80 -31 -22 2 54 -22 39 27 -21 47 34 -22 54 49 164 0 0 -22 11 52 9 41 23 10 79 -32 -21 53 35 -22 30 10 -21 38 14 -22 45 32 165 0 0 -22 2 18 9 41 21 11 79 -33 -21 44 0 -22 20 37 -21 28 38 -22 36 0 166 0 0 -21 52 29 9 41 18 12 78 -34 -21 34 10 -22 10 48 -21 18 47 -22 26 12 167 0 0 -21 42 24 9 41 15 13 78 -35 -21 24 4 -22 0 44 -21 8 41 -22 16 9 168 0 0 -21 32 4 9 41 12 14 78 -36 -21 13 43 -21 50 25 -20 58 19 -22 5 51 169 0 0 -21 21 29 9 41 9 15 77 -36 -21 3 7 -21 39 51 -20 47 43 -21 55 17 170 0 0 -21 10 39 9 41 5 15 77 -37 -20 52 16 -21 29 2 -20 36 51 -21 44 29 171 0 0 -20 59 34 9 41 2 16 77 -38 -20 41 11 -21 17 58 -20 25 45 -21 33 26 172 0 0 -20 48 15 9 40 58 17 76 -39 -20 29 50 -21 6 39 -20 14 24 -21 22 8 173 0 0 -20 36 41 9 40 53 18 76 -40 -20 18 16 -20 55 7 -20 2 48 -21 10 36 174 0 0 -20 24 53 9 40 49 19 75 -41 -20 6 27 -20 43 19 -19 50 58 -20 58 50 175 0 0 -20 12 50 9 40 44 20 75 -41 -19 54 24 -20 31 18 -19 38 54 -20 46 49 176 0 0 -20 0 34 9 40 39 21 75 -42 -19 42 7 -20 19 3 -19 26 37 -20 34 35 177 0 0 -19 48 5 9 40 34 22 74 -43 -19 29 36 -20 6 34 -19 14 5 -20 22 7 178 0 0 -19 35 21 9 40 29 23 74 -44 -19 16 52 -19 53 51 -19 1 20 -20 9 25 179 0 0 -19 22 24 9 40 23 24 74 -45 -19 3 54 -19 40 56 -18 48 22 -19 56 30 180 0 0 -19 9 15 9 40 18 25 73 -46 -18 50 43 -19 27 47 -18 35 10 -19 43 22 -179 0 0 -18 55 52 9 40 12 26 73 -46 -18 37 20 -19 14 25 -18 21 46 -19 30 0 -178 0 0 -18 42 16 9 40 5 27 73 -47 -18 23 43 -19 0 50 -18 8 9 -19 16 26 -177 0 0 -18 28 28 9 39 59 28 72 -48 -18 9 54 -18 47 3 -17 54 19 -19 2 40 -176 0 0 -18 14 28 9 39 52 29 72 -49 -17 55 53 -18 33 3 -17 40 17 -18 48 41 -175 0 0 -18 0 15 9 39 46 30 72 -50 -17 41 40 -18 18 52 -17 26 3 -18 34 30 -174 0 0 -17 45 51 9 39 39 31 71 -50 -17 27 14 -18 4 28 -17 11 37 -18 20 7 -173 0 0 -17 31 15 9 39 31 32 71 -51 -17 12 38 -17 49 53 -16 57 0 -18 5 33 -172 0 0 -17 16 28 9 39 24 32 71 -52 -16 57 50 -17 35 7 -16 42 11 -17 50 47 -171 0 0 -17 1 29 9 39 16 33 70 -53 -16 42 50 -17 20 9 -16 27 11 -17 35 50 -170 0 0 -16 46 20 9 39 8 34 70 -53 -16 27 40 -17 5 0 -16 12 0 -17 20 42 -169 0 0 -16 31 0 9 39 0 35 70 -54 -16 12 19 -16 49 41 -15 56 39 -17 5 24 -168 0 0 -16 15 30 9 38 52 36 69 -55 -15 56 48 -16 34 12 -15 41 7 -16 49 55 -167 0 0 -15 59 49 9 38 44 37 69 -56 -15 41 7 -16 18 32 -15 25 25 -16 34 16 -166 0 0 -15 43 59 9 38 35 38 69 -56 -15 25 16 -16 2 42 -15 9 34 -16 18 27 -165 0 0 -15 27 59 9 38 26 39 68 -57 -15 9 16 -15 46 43 -14 53 33 -16 2 28 -164 0 0 -15 11 50 9 38 17 40 68 -58 -14 53 6 -15 30 34 -14 37 22 -15 46 20 -163 0 0 -14 55 31 9 38 8 41 68 -58 -14 36 47 -15 14 17 -14 21 3 -15 30 3 -162 0 0 -14 39 4 9 37 58 42 67 -59 -14 20 19 -14 57 50 -14 4 35 -15 13 37 -161 0 0 -14 22 29 9 37 49 43 67 -60 -14 3 43 -14 41 16 -13 47 58 -14 57 3 -160 0 0 -14 5 45 9 37 39 44 67 -60 -13 46 59 -14 24 33 -13 31 13 -14 40 20 -159 0 0 -13 48 54 9 37 29 45 66 -61 -13 30 7 -14 7 42 -13 14 21 -14 23 30 -158 0 0 -13 31 55 9 37 19 46 66 -62 -13 13 7 -13 50 43 -12 57 21 -14 6 32 -157 0 0 -13 14 49 9 37 8 47 66 -62 -12 56 0 -13 33 37 -12 40 14 -13 49 26 -156 0 0 -12 57 35 9 36 58 48 65 -63 -12 38 47 -13 16 25 -12 22 59 -13 32 14 -155 0 0 -12 40 15 9 36 47 49 65 -63 -12 21 26 -12 59 5 -12 5 39 -13 14 55 -154 0 0 -12 22 49 9 36 36 50 65 -64 -12 4 0 -12 41 39 -11 48 12 -12 57 29 -153 0 0 -12 5 17 9 36 25 51 64 -64 -11 46 27 -12 24 7 -11 30 39 -12 39 58 -152 0 0 -11 47 39 9 36 14 52 64 -65 -11 28 49 -12 6 30 -11 13 0 -12 22 21 -151 0 0 -11 29 56 9 36 3 53 63 -65 -11 11 5 -11 48 47 -10 55 16 -12 4 38 -150 0 0 -11 12 7 9 35 51 54 63 -65 -10 53 16 -11 30 59 -10 37 27 -11 46 50 -149 0 0 -10 54 14 9 35 39 55 63 -66 -10 35 23 -11 13 6 -10 19 33 -11 28 58 -148 0 0 -10 36 17 9 35 28 56 62 -66 -10 17 25 -10 55 9 -10 1 36 -11 11 1 -147 0 0 -10 18 15 9 35 16 57 62 -66 - 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67 0 0 9 36 42 9 17 51 44 269 -15 9 54 50 9 18 32 10 10 4 9 3 17 - 66 0 0 9 43 48 9 17 41 43 269 -14 10 1 56 9 25 39 10 17 9 9 10 24 - 65 0 0 9 50 37 9 17 32 42 270 -13 10 8 44 9 32 29 10 23 57 9 17 14 - 64 0 0 9 57 9 9 17 22 41 270 -12 10 15 16 9 39 2 10 30 29 9 23 48 - 63 0 0 10 3 25 9 17 13 40 270 -12 10 21 32 9 45 18 10 36 44 9 30 5 - 62 0 0 10 9 24 9 17 4 39 270 -11 10 27 30 9 51 18 10 42 42 9 36 4 - 61 0 0 10 15 6 9 16 55 38 270 -10 10 33 12 9 57 0 10 48 23 9 41 47 - 60 0 0 10 20 31 9 16 47 37 270 -9 10 38 36 10 2 26 10 53 47 9 47 13 - 59 0 0 10 25 39 9 16 38 36 270 -8 10 43 44 10 7 34 10 58 54 9 52 22 - 58 0 0 10 30 30 9 16 30 35 270 -7 10 48 34 10 12 25 11 3 44 9 57 13 - 57 0 0 10 35 3 9 16 22 34 270 -6 10 53 7 10 16 59 11 8 17 10 1 47 - 56 0 0 10 39 19 9 16 14 34 270 -5 10 57 22 10 21 15 11 12 32 10 6 4 - 55 0 0 10 43 17 9 16 7 33 271 -4 11 1 20 10 25 14 11 16 30 10 10 3 - 54 0 0 10 46 58 9 15 59 32 271 -3 11 5 1 10 28 55 11 20 10 10 13 44 - 53 0 0 10 50 21 9 15 52 31 271 -2 11 8 24 10 32 18 11 23 33 10 17 8 - 52 0 0 10 53 27 9 15 45 30 271 -2 11 11 29 10 35 24 11 26 38 10 20 14 - 51 0 0 10 56 15 9 15 38 29 271 -1 11 14 17 10 38 12 11 29 25 10 23 2 Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 0080-01182-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 12 07.7036 DE: +06 09 33.049 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .022 ) * V mag [mag]: 9.8 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (487) Venetia approx. diameter [km]: 66 approx. diameter ["]: .059 distance from Earth [AU]: 1.53300 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1112 number of rejected observations: 99 time covered by the observations: 1903 Dec 21 - 2012 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.011, 72° remarks: * orbital elements for (487) Venetia : Mean anomaly = 12.15813962 deg Arg. of pericenter = 281.65276721 deg Long. of node = 114.85023072 deg Inclination = 10.23887859 deg Eccentricity = 0.08850801 Semimajor axis = 2.67088728 AU Perihelion dist = 2.43449237 AU Mag: H = 8.19, G = 0.15 Epoch of elements : MJD 56228.39400000 TDT (2012 Oct 28.394) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 28 487 Venetia 9h 27.8m UT 9.8 4 12 7.704 6 9 33.05TYC 0080-01182-1 10.3 11.7 66 8.7 1.533 -1.586 -7.13 -116.0386 6.161 34.01 -13.31 9.4626 0.03391 -0.11382 -4.11680 -1.24309 -0.00276 0.00078 2000 10.26278920121020.00000281.652767114.850231 10.2388790.08850801 2.6708873 2.4344924 8.1 5.00.15 RATE 2.2579830 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.025 80 1.42 0.025 0 0-4-1 056226.0020121028_1182-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org