IOTA/IOTA-ES occultation update for (487) Venetia / TYC 0071-00325-1 event on 2012 Dec 03, 13:23 UT Visible from Japan, China, SW Asia Summary ------- On 2012 Dec 03 UT, the 66 km diameter asteroid (487) Venetia will occult a 11.0 mag star in the constellation Taurus for observers along a path across Japan, China, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 11.6 mag (the magnitude of the asteroid) for at most 6.7 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: 91 * date and approx. time of event: 2012 Dec 03, 13:14 - 2012 Dec 03, 13:33 UT * geocentric midpoint of event [JD]: 2456265.05818333 * magnitude of target star: 11.0 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 6.7 * Moon: 80 % sunlit, 70° distance * Sun: 158° distance * rough path description: Japan, China, SW Asia The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .030", 84° ) * approx speed of asteroid's shadow [km/s]: 9.8550 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0071-00325-1 by 487 Venetia on 2012 Dec 3 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 46 0 0 39 3 45 13 33 6 1 83 -1 39 24 34 38 43 0 39 45 53 38 21 55 47 0 0 39 9 32 13 33 5 2 84 -1 39 30 21 38 48 48 39 51 39 38 27 43 48 0 0 39 15 10 13 33 5 3 85 -2 39 35 58 38 54 26 39 57 16 38 33 21 49 0 0 39 20 38 13 33 5 3 85 -3 39 41 26 38 59 54 40 2 43 38 38 50 50 0 0 39 25 57 13 33 4 4 86 -4 39 46 44 39 5 14 40 8 1 38 44 10 51 0 0 39 31 6 13 33 3 5 87 -4 39 51 53 39 10 23 40 13 10 38 49 20 52 0 0 39 36 6 13 33 2 6 87 -5 39 56 53 39 15 24 40 18 9 38 54 21 53 0 0 39 40 57 13 33 1 6 88 -6 40 1 43 39 20 15 40 22 59 38 59 12 54 0 0 39 45 38 13 33 0 7 89 -7 40 6 24 39 24 56 40 27 39 39 3 54 55 0 0 39 50 9 13 32 58 8 89 -7 40 10 55 39 29 28 40 32 10 39 8 26 56 0 0 39 54 31 13 32 57 9 90 -8 40 15 17 39 33 50 40 36 32 39 12 49 57 0 0 39 58 44 13 32 55 10 90 -9 40 19 29 39 38 3 40 40 43 39 17 2 58 0 0 40 2 47 13 32 54 10 91 -9 40 23 31 39 42 6 40 44 46 39 21 5 59 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23 6 17 21 42 7 -132 0 0 22 16 36 13 14 34 8 273 -27 22 37 27 21 55 48 22 58 49 21 34 41 -131 0 0 22 9 17 13 14 33 7 273 -26 22 30 8 21 48 30 22 51 29 21 27 23 -130 0 0 22 2 8 13 14 31 6 274 -25 22 22 59 21 41 21 22 44 19 21 20 14 -129 0 0 21 55 8 13 14 30 5 274 -24 22 15 58 21 34 22 22 37 18 21 13 15 -128 0 0 21 48 17 13 14 29 4 275 -23 22 9 7 21 27 31 22 30 27 21 6 25 -127 0 0 21 41 36 13 14 29 3 275 -22 22 2 26 21 20 51 22 23 45 20 59 45 -126 0 0 21 35 5 13 14 28 2 275 -21 21 55 55 21 14 20 22 17 14 20 53 14 -125 0 0 21 28 44 13 14 28 1 276 -20 21 49 33 21 7 59 22 10 52 20 46 54 -124 0 0 21 22 33 13 14 28 0 276 -19 21 43 22 21 1 49 22 4 40 20 40 44 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0071-00325-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 40 36.3717 DE: +05 41 32.528 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .030, .029 ) * V mag [mag]: 11.0 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (487) Venetia approx. diameter [km]: 66 approx. diameter ["]: .060 distance from Earth [AU]: 1.51000 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1115 number of rejected observations: 100 time covered by the observations: 1903 Dec 21 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.010, 72° remarks: * orbital elements for (487) Venetia : Mean anomaly = 20.34144855 deg Arg. of pericenter = 281.63269653 deg Long. of node = 114.84465076 deg Inclination = 10.23947859 deg Eccentricity = 0.08860915 Semimajor axis = 2.67113768 AU Perihelion dist = 2.43445045 AU Mag: H = 8.19, G = 0.15 Epoch of elements : MJD 56264.55800000 TDT (2012 Dec 03.558) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 3 487 Venetia 13h 23.8m UT 11.0 3 40 36.372 5 41 32.53TYC 0071-00325-1 12.1 11.6 66 6.7 1.510 -2.144 4.97 141.4288 5.692 -23.44 -22.20 13.3964 0.07683 0.49595 -5.49695 0.85117 0.00135 0.00166 2000 19.31240520121129.00000281.632697114.844651 10.2394790.08860915 2.6711377 2.4344504 8.1 5.00.15 RATE 2.2576660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.030 84 1.51 0.031 0 0-3-2 056264.0020121203_0325-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org