IOTA/IOTA-ES occultation update for (289) Nenetta / TYC 5567-00185-1 event on 2008 Mar 28, 18:54 UT Visible from Australia, Arabia Summary ------- On 2008 Mar 28 UT, the 34 km diameter asteroid (289) Nenetta will occult a 10.5 mag star in the constellation Libra for observers along a path across Australia, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.8 mag (the magnitude of the asteroid) for at most 3.0 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: 47 * date and approx. time of event: 2008 Mar 28, 18:46 - 2008 Mar 28, 19:04 UT * midpoint of event [JD]: 2454554.2882375 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 3.0 * Moon: 61 % sunlit, 48° distance * Sun: 150° distance * rough path description: Australia, Arabia The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.36 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .026", 97° ) * approx speed of asteroid's shadow [km/s]: 11.3989 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5567-00185-1 by 289 Nenetta on 2008 Mar 28 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 21 0 0 29 23 47 19 4 23 0 102 -29 29 33 12 29 14 23 .. .. .. 28 48 47 22 0 0 29 12 26 19 4 23 1 102 -30 29 21 51 29 3 0 29 47 29 28 37 22 23 0 0 29 0 34 19 4 22 2 103 -31 29 10 1 28 51 7 29 35 42 28 25 26 24 0 0 28 48 12 19 4 22 3 103 -31 28 57 40 28 38 44 29 23 24 28 13 0 25 0 0 28 35 20 19 4 22 4 104 -32 28 44 49 28 25 51 29 10 36 28 0 3 26 0 0 28 21 58 19 4 21 5 104 -33 28 31 28 28 12 27 28 57 19 27 46 36 27 0 0 28 8 5 19 4 20 5 105 -34 28 17 36 27 58 33 28 43 31 27 32 39 28 0 0 27 53 42 19 4 19 6 105 -35 28 3 14 27 44 9 28 29 12 27 18 11 29 0 0 27 38 48 19 4 18 7 106 -36 27 48 22 27 29 14 28 14 24 27 3 12 30 0 0 27 23 24 19 4 17 8 106 -37 27 32 59 27 13 49 27 59 5 26 47 43 31 0 0 27 7 29 19 4 16 9 107 -38 27 17 6 26 57 52 27 43 15 26 31 43 32 0 0 26 51 4 19 4 14 10 107 -39 27 0 42 26 41 26 27 26 55 26 15 13 33 0 0 26 34 8 19 4 12 11 108 -40 26 43 48 26 24 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277 -1 -33 25 9 -33 43 40 -32 59 59 -34 8 50 Uncertainty in time = +/- 4 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 5567-00185-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 30 17.2946 DE: -10 18 48.476 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .021 ) * V mag [mag]: 10.5 * B mag [mag]: 12.0 * Apparent position with proper motion RA(deg): 217.6895041710 DE(deg): -10.3537094872 * Equation of equinoxes (radians) : 0.000040997696376 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (289) Nenetta approx. diameter [km]: 34 approx. diameter ["]: .019 distance from Earth [AU]: 2.52000 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 967 number of rejected observations: 81 time covered by the observations: 1902 Aug 07 - 2007 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.014, 103° remarks: * orbital elements for (289) Nenetta : Mean anomaly = 207.44640034 deg Arg. of pericenter = 189.45715021 deg Long. of node = 182.19736507 deg Inclination = 6.69287452 deg Eccentricity = 0.20679710 Semimajor axis = 2.87045524 AU Perihelion dist = 2.27685342 AU Mag: H = 9.47, G = 0.15 Epoch of elements : MJD 54553.78800000 TDT (2008 Mar 28.788) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 28 289 Nenetta 18h 55.1m UT 10.5 14 30 17.295-10 18 48.48TYC 5567-00185-1 12.0 14.8 34 3.0 2.520 -1.304 11.61 107.2473 -10.317 -102.54 3.36 18.9177 -0.01177 -0.01982 -5.50873 3.32387 -0.00295 0.00059 2000 206.6787062008 325.00000189.457150182.197365 6.6928750.20679710 2.8704552 2.2768534 9.5 5.00.15 RATE 2.0266470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.026 97 2.36 0.026 0 54510.5020080328_0185-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 20:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org