IOTA/IOTA-ES occultation update for (1070) Tunica / UCAC2 28785104 event on 2012 Sep 16, 07:51 UT Visible from Pacific Ocean Summary ------- On 2012 Sep 16 UT, the 39 km diameter asteroid (1070) Tunica will occult a 11.2 mag star in the constellation Scutum for observers along a path across Pacific Ocean. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 16.1 mag (the magnitude of the asteroid) for at most 3.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 17 * date and approx. time of event: 2012 Sep 16, 07:47 - 2012 Sep 16, 08:00 UT * geocentric midpoint of event [JD]: 2456186.82745833 * magnitude of target star: 11.2 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 3.5 * Moon: 0 % sunlit, 108° distance * Sun: 109° distance * rough path description: Pacific Ocean The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 3.86 * 1 sigma uncertainty interval [seconds]: +/- 13.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .082 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .082", .080", 90° ) * approx speed of asteroid's shadow [km/s]: 11.2294 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 28785104 by 1070 Tunica on 2012 Sep 16 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 Latitude Latitude Latitude Latitude 153 0 0 10 28 11 7 47 21 64 136 -1 10 11 34 10 44 47 8 3 4 12 52 50 154 0 0 9 15 53 7 47 35 65 136 -2 8 59 11 9 32 35 6 50 1 11 41 20 155 0 0 8 2 44 7 47 49 67 136 -3 7 45 57 8 19 31 5 36 9 10 28 54 156 0 0 6 48 47 7 48 4 69 136 -4 6 31 56 7 5 38 4 21 34 9 15 36 157 0 0 5 34 9 7 48 19 70 136 -5 5 17 13 5 51 4 3 6 22 8 1 32 158 0 0 4 18 54 7 48 35 72 136 -6 4 1 55 4 35 53 1 50 38 6 46 48 159 0 0 3 3 9 7 48 50 74 135 -7 2 46 8 3 20 11 0 34 29 5 31 28 160 0 0 1 47 1 7 49 6 75 135 -8 1 29 57 2 4 4 - 0 41 59 4 15 39 161 0 0 0 30 34 7 49 22 77 134 -10 0 13 29 0 47 39 - 1 58 39 2 59 28 162 0 0 - 0 46 3 7 49 38 78 134 -11 - 1 3 10 - 0 28 57 - 3 15 25 1 43 1 163 0 0 - 2 2 45 7 49 54 80 133 -12 - 2 19 52 - 1 45 38 - 4 32 10 0 26 24 164 0 0 - 3 19 24 7 50 10 82 131 -13 - 3 36 31 - 3 2 17 - 5 48 46 - 0 50 16 165 0 0 - 4 35 54 7 50 27 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Uncertainty in time = +/- 14 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: UCAC2 28785104 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 53 20.7188 DE: -08 42 32.481 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .078, .078 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1070) Tunica approx. diameter [km]: 39 approx. diameter ["]: .021 distance from Earth [AU]: 2.57000 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 967 number of rejected observations: 37 time covered by the observations: 1903 Sep 29 - 2012 Sep 01 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.018, 94° remarks: * orbital elements for (1070) Tunica : Mean anomaly = 316.78624625 deg Arg. of pericenter = 185.27947061 deg Long. of node = 165.42222751 deg Inclination = 16.96404952 deg Eccentricity = 0.07973492 Semimajor axis = 3.23133640 AU Perihelion dist = 2.97368604 AU Mag: H = 10.66, G = 0.15 Epoch of elements : MJD 56186.32700000 TDT (2012 Sep 16.327) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 16 1070 Tunica 7h 51.5m UT 11.2 18 53 20.719- 8 42 32.48UCAC2 28785104 0.0 16.1 39 3.5 2.570 0.953 -16.45 169.7817 -8.704 60.81 2.44 7.8590 -0.01550 -0.01672 4.12684 -4.81059 0.00546 0.00004 2000 315.7126802012 910.00000185.279471165.422228 16.9640500.07973492 3.2313364 2.973686110.7 5.00.15 RATE 1.6968010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.082 0.080 90 4.86 0.081 0 0-2-1 056178.0020120916_785104 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org