IOTA/IOTA-ES occultation update for (1076) Viola / HIP 25959 event on 2012 Nov 11, 23:43 UT Visible from Africa Summary ------- On 2012 Nov 11 UT, the 26 km diameter asteroid (1076) Viola will occult a 8.0 mag star in the constellation Taurus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.2 mag to 15.2 mag (the magnitude of the asteroid) for at most 6.4 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: . The event at a glimpse ---------------------- * Rank: 46 * date and approx. time of event: 2012 Nov 11, 23:25 - 2012 Nov 12, 00:05 UT * geocentric midpoint of event [JD]: 2456243.48832083 * magnitude of target star: 8.0 * magnitude drop [mag]: 7.2 * estimated maximum duration [s]: 6.4 * Moon: 5 % sunlit, 120° distance * Sun: 146° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 1.41 * 1 sigma uncertainty interval [seconds]: +/- 13.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .040", 85° ) * approx speed of asteroid's shadow [km/s]: 4.1014 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 25959 by 1076 Viola on 2012 Nov 11 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 - 44 0 0 -38 48 51 24 5 59 1 66 -23 -38 40 2 -38 57 40 .. .. .. -39 22 38 - 43 0 0 -38 28 36 24 5 59 2 66 -24 -38 19 46 -38 37 26 .. .. .. -39 2 26 - 42 0 0 -38 8 7 24 5 58 2 65 -25 -37 59 17 -38 16 58 -37 34 27 -38 42 0 - 41 0 0 -37 47 26 24 5 57 3 65 -25 -37 38 35 -37 56 18 -37 13 43 -38 21 21 - 40 0 0 -37 26 32 24 5 55 4 64 -26 -37 17 41 -37 35 24 -36 52 47 -38 0 29 - 39 0 0 -37 5 26 24 5 53 5 63 -27 -36 56 34 -37 14 19 -36 31 39 -37 39 25 - 38 0 0 -36 44 8 24 5 51 6 63 -28 -36 35 16 -36 53 1 -36 10 20 -37 18 9 - 37 0 0 -36 22 39 24 5 48 7 62 -28 -36 13 47 -36 31 33 -35 48 49 -36 56 41 - 36 0 0 -36 0 59 24 5 44 8 62 -29 -35 52 6 -36 9 53 -35 27 7 -36 35 3 - 35 0 0 -35 39 9 24 5 41 8 61 -30 -35 30 15 -35 48 3 -35 5 16 -36 13 14 - 34 0 0 -35 17 8 24 5 37 9 60 -31 -35 8 15 -35 26 3 -34 43 14 -35 51 14 - 33 0 0 -34 54 58 24 5 32 10 60 -31 -34 46 4 -35 3 53 -34 21 3 -35 29 6 - 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6 34 7 - 6 50 14 - 6 11 28 - 7 13 1 Uncertainty in time = +/- 14 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: HIP 25959 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 32 18.0691 DE: +17 44 36.633 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .022, .010 ) * V mag [mag]: 8.0 * B mag [mag]: 8.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1076) Viola approx. diameter [km]: 26 approx. diameter ["]: .029 distance from Earth [AU]: 1.23600 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1017 number of rejected observations: 68 time covered by the observations: 1926 Nov 04 - 2012 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.039, 84° remarks: * orbital elements for (1076) Viola : Mean anomaly = 345.71855990 deg Arg. of pericenter = 303.97660075 deg Long. of node = 143.73179484 deg Inclination = 3.31863375 deg Eccentricity = 0.14573686 Semimajor axis = 2.47481065 AU Perihelion dist = 2.11413951 AU Mag: H = 12.09, G = 0.15 Epoch of elements : MJD 56242.98800000 TDT (2012 Nov 11.988) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 11 1076 Viola 23h 43.2m UT 8.0 5 32 18.069 17 44 36.63HIP 25959 8.5 15.2 26 6.4 1.236 -1.125 -3.77 35.7626 17.744 -179.76 -17.74 23.7197 0.10612 -0.45685 -2.25341 -0.53019 -0.00311 0.00030 2000 344.962125201211 9.00000303.976601143.731795 3.3186340.14573686 2.4748107 2.114139512.3 5.00.15 RATE 2.5315770 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.040 85 2.41 0.041 0 0 1 3 056226.0020121111__25959 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org