IOTA/IOTA-ES occultation update for (1076) Viola / TYC 1300-00733-1 event on 2012 Nov 26, 22:02 UT Visible from Russia, Scandanavia Summary ------- On 2012 Nov 26 UT, the 26 km diameter asteroid (1076) Viola will occult a 10.1 mag star in the constellation Taurus for observers along a path across Russia, Scandanavia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 14.8 mag (the magnitude of the asteroid) for at most 3.6 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: 40 * date and approx. time of event: 2012 Nov 26, 21:53 - 2012 Nov 26, 22:12 UT * geocentric midpoint of event [JD]: 2456258.41855417 * magnitude of target star: 10.1 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 3.6 * Moon: 97 % sunlit, 35° distance * Sun: 163° distance * rough path description: Russia, Scandanavia The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 1.65 * 1 sigma uncertainty interval [seconds]: +/- 7.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .051", 85° ) * approx speed of asteroid's shadow [km/s]: 7.3408 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1300-00733-1 by 1076 Viola on 2012 Nov 26 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 - 64 0 0 42 14 31 22 12 12 1 67 -15 42 26 8 42 2 56 43 4 49 .. .. .. - 63 0 0 42 34 24 22 12 11 1 68 -16 42 46 2 42 22 48 43 24 48 .. .. .. - 62 0 0 42 54 23 22 12 11 2 68 -17 43 6 3 42 42 47 43 44 53 .. .. .. - 61 0 0 43 14 29 22 12 10 3 69 -18 43 26 10 43 2 51 44 5 4 .. .. .. - 60 0 0 43 34 40 22 12 9 4 70 -19 43 46 22 43 23 2 44 25 21 .. .. .. - 59 0 0 43 54 57 22 12 7 5 70 -19 44 6 40 43 43 17 44 45 42 43 5 7 - 58 0 0 44 15 18 22 12 6 5 71 -20 44 27 2 44 3 36 45 6 8 43 25 23 - 57 0 0 44 35 42 22 12 4 6 72 -21 44 47 27 44 24 0 45 26 38 43 45 43 - 56 0 0 44 56 10 22 12 2 7 72 -22 45 7 56 44 44 26 45 47 10 44 6 6 - 55 0 0 45 16 40 22 11 59 8 73 -22 45 28 28 45 4 55 46 7 45 44 26 32 - 54 0 0 45 37 12 22 11 57 9 74 -23 45 49 1 45 25 27 46 28 22 44 47 0 - 53 0 0 45 57 46 22 11 54 9 75 -24 46 9 36 45 45 59 46 49 0 45 7 29 - 52 0 0 46 18 21 22 11 51 10 75 -25 46 30 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-1 54 10 28 53 46 28 54 50 35 53 7 19 149 0 0 53 39 30 21 53 24 7 291 0 53 51 32 53 27 31 54 31 39 52 48 22 Uncertainty in time = +/- 7 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1300-00733-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 22 09.4225 DE: +17 25 02.223 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .029 ) * V mag [mag]: 10.1 * B mag [mag]: 10.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1076) Viola approx. diameter [km]: 26 approx. diameter ["]: .031 distance from Earth [AU]: 1.15900 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1019 number of rejected observations: 68 time covered by the observations: 1926 Nov 04 - 2012 Nov 04 1 sigma uncertainty ellipse (major, minor, PA): 0.061, 0.042, 84° remarks: * orbital elements for (1076) Viola : Mean anomaly = 349.50517374 deg Arg. of pericenter = 303.96925012 deg Long. of node = 143.72968089 deg Inclination = 3.31867246 deg Eccentricity = 0.14572331 Semimajor axis = 2.47478753 AU Perihelion dist = 2.11415330 AU Mag: H = 12.09, G = 0.15 Epoch of elements : MJD 56257.91900000 TDT (2012 Nov 26.919) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 26 1076 Viola 22h 2.7m UT 10.1 5 22 9.422 17 25 2.22TYC 1300-00733-1 10.5 14.8 26 3.6 1.159 -2.190 -2.60 43.6268 17.420 -153.78 -21.14 22.0453 -0.06238 0.75133 -4.12916 -0.34261 -0.00155 0.00043 2000 347.50039020121119.00000303.969250143.729681 3.3186720.14572331 2.4747875 2.114153312.3 5.00.15 RATE 2.5316130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.051 85 2.65 0.051 0 0 5 3 056247.0020121126_0733-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org