IOTA/IOTA-ES occultation update for (1162) Larissa / TYC 5820-00100-1 event on 2012 Sep 17, 17:58 UT Visible from Japan, Taiwan, SE Asia, Africa Summary ------- On 2012 Sep 17 UT, the 49 km diameter asteroid (1162) Larissa will occult a 10.4 mag star in the constellation Aquarius for observers along a path across Japan, Taiwan, SE Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 15.0 mag (the magnitude of the asteroid) for at most 3.4 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: UCAC. The event at a glimpse ---------------------- * Rank: 48 * date and approx. time of event: 2012 Sep 17, 17:51 - 2012 Sep 17, 18:06 UT * geocentric midpoint of event [JD]: 2456188.24935 * magnitude of target star: 10.4 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 3.4 * Moon: 4 % sunlit, 148° distance * Sun: 170° distance * rough path description: Japan, Taiwan, SE Asia, Africa The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.35 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .031", 72° ) * approx speed of asteroid's shadow [km/s]: 14.0880 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5820-00100-1 by 1162 Larissa on 2012 Sep 17 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 - 3 0 0 - 7 23 28 18 6 16 9 97 0 - 7 9 42 - 7 37 13 - 6 32 26 - 8 14 18 - 2 0 0 - 7 27 39 18 6 15 10 97 -1 - 7 13 53 - 7 41 24 - 6 36 39 - 8 18 27 - 1 0 0 - 7 31 25 18 6 13 11 96 -2 - 7 17 40 - 7 45 10 - 6 40 27 - 8 22 12 0 0 0 - 7 34 48 18 6 12 12 96 -3 - 7 21 3 - 7 48 32 - 6 43 51 - 8 25 34 1 0 0 - 7 37 47 18 6 10 13 96 -4 - 7 24 2 - 7 51 31 - 6 46 51 - 8 28 31 2 0 0 - 7 40 21 18 6 8 14 96 -5 - 7 26 37 - 7 54 5 - 6 49 26 - 8 31 5 3 0 0 - 7 42 32 18 6 6 15 96 -6 - 7 28 48 - 7 56 15 - 6 51 38 - 8 33 14 4 0 0 - 7 44 19 18 6 4 16 96 -7 - 7 30 35 - 7 58 2 - 6 53 25 - 8 35 0 5 0 0 - 7 45 42 18 6 1 17 96 -8 - 7 31 58 - 7 59 25 - 6 54 49 - 8 36 22 6 0 0 - 7 46 40 18 5 59 18 96 -9 - 7 32 57 - 8 0 23 - 6 55 48 - 8 37 21 7 0 0 - 7 47 15 18 5 56 19 95 -10 - 7 33 32 - 8 0 58 - 6 56 24 - 8 37 55 8 0 0 - 7 47 26 18 5 54 20 95 -11 - 7 33 43 - 8 1 9 - 6 56 35 - 8 38 6 9 0 0 - 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46 54 165 0 0 34 47 15 17 51 46 1 260 -12 35 1 11 34 33 20 35 38 51 33 55 51 166 0 0 34 55 49 17 51 46 1 260 -11 35 9 44 34 41 55 35 47 22 34 4 28 Uncertainty in time = +/- 6 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 5820-00100-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 07 43.9271 DE: -07 46 04.000 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1162) Larissa approx. diameter [km]: 49 approx. diameter ["]: .023 distance from Earth [AU]: 2.92400 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1385 number of rejected observations: 71 time covered by the observations: 1930 Jan 20 - 2012 Aug 08 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.022, 66° remarks: * orbital elements for (1162) Larissa : Mean anomaly = 82.90304825 deg Arg. of pericenter = 212.17405135 deg Long. of node = 39.78907520 deg Inclination = 1.88759993 deg Eccentricity = 0.11036667 Semimajor axis = 3.92283376 AU Perihelion dist = 3.48988367 AU Mag: H = 9.49, G = 0.15 Epoch of elements : MJD 56187.74900000 TDT (2012 Sep 17.749) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 17 1162 Larissa 17h 59.1m UT 10.4 23 7 43.927- 7 46 4.00TYC 5820-00100-1 11.0 15.0 49 3.4 2.924 -1.504 -8.49 80.0966 -7.765 -91.20 1.89 17.9844 -0.08826 0.23224 -7.43300 -2.82471 0.00089 0.00060 2000 81.9200562012 910.00000212.174051 39.789075 1.8876000.11036667 3.9228338 3.4898837 9.4 5.00.15 RATE 1.2685400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.031 72 2.35 0.031 0 0 1 0 056165.0020120917_0100-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org