IOTA/IOTA-ES occultation update for (188) Menippe / TYC 1202-00625-1 event on 2012 Sep 17, 10:21 UT Visible from S USA, Mexico Summary ------- On 2012 Sep 17 UT, the 39 km diameter asteroid (188) Menippe will occult a 11.6 mag star in the constellation Pisces for observers along a path across S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 12.9 mag (the magnitude of the asteroid) for at most 5.1 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: 77 * date and approx. time of event: 2012 Sep 17, 10:10 - 2012 Sep 17, 10:36 UT * geocentric midpoint of event [JD]: 2456187.9321125 * magnitude of target star: 11.6 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 5.1 * Moon: 3 % sunlit, 165° distance * Sun: 148° distance * rough path description: S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.72 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .024", 82° ) * approx speed of asteroid's shadow [km/s]: 7.6758 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1202-00625-1 by 188 Menippe 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 144 0 0 -27 16 33 10 36 2 1 64 -31 -27 4 46 -27 28 19 -26 47 49 -27 45 17 145 0 0 -26 50 22 10 36 2 2 64 -32 -26 38 33 -27 2 11 -26 21 33 -27 19 12 146 0 0 -26 23 40 10 36 2 3 63 -33 -26 11 49 -26 35 31 -25 54 46 -26 52 36 147 0 0 -25 56 27 10 36 1 4 63 -34 -25 44 34 -26 8 21 -25 27 27 -26 25 28 148 0 0 -25 28 43 10 36 0 5 62 -35 -25 16 48 -25 40 39 -24 59 38 -25 57 50 149 0 0 -25 0 29 10 35 58 6 62 -36 -24 48 31 -25 12 27 -24 31 18 -25 29 41 150 0 0 -24 31 44 10 35 57 7 62 -37 -24 19 45 -24 43 44 -24 2 29 -25 1 2 151 0 0 -24 2 30 10 35 55 8 61 -38 -23 50 28 -24 14 32 -23 33 9 -24 31 52 152 0 0 -23 32 46 10 35 52 9 61 -39 -23 20 42 -23 44 50 -23 3 20 -24 2 14 153 0 0 -23 2 33 10 35 50 10 60 -40 -22 50 27 -23 14 39 -22 33 2 -23 32 6 154 0 0 -22 31 52 10 35 47 11 60 -41 -22 19 44 -22 44 0 -22 2 16 -23 1 29 155 0 0 -22 0 42 10 35 44 12 60 -42 -21 48 32 -22 12 52 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18 30 280 -1 29 39 41 29 18 19 29 55 3 29 2 56 Uncertainty in time = +/- 5 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 1202-00625-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 04 57.3227 DE: +22 18 54.151 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 11.6 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (188) Menippe approx. diameter [km]: 39 approx. diameter ["]: .034 distance from Earth [AU]: 1.55900 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 876 number of rejected observations: 60 time covered by the observations: 1915 Jun 14 - 2012 Aug 29 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.014, 78° remarks: * orbital elements for (188) Menippe : Mean anomaly = 45.00419321 deg Arg. of pericenter = 68.74657782 deg Long. of node = 241.17149642 deg Inclination = 11.73373514 deg Eccentricity = 0.17605490 Semimajor axis = 2.76178702 AU Perihelion dist = 2.27556090 AU Mag: H = 9.19, G = 0.15 Epoch of elements : MJD 56187.43200000 TDT (2012 Sep 17.432) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 17 188 Menippe 10h 22.2m UT 11.6 1 4 57.323 22 18 54.15TYC 1202-00625-1 12.1 12.9 39 5.1 1.559 -1.581 -10.82 -136.0795 22.318 23.03 2.01 10.3707 0.02846 -0.05874 -3.88589 -1.91572 -0.00200 -0.00217 2000 43.4082242012 910.00000 68.746578241.171496 11.7337350.17605490 2.7617870 2.2755609 9.2 5.00.15 RATE 2.1474290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.024 82 1.72 0.025 0 0-3 1 056178.0020120917_0625-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org