IOTA/IOTA-ES occultation update for (11) Parthenope / TYC 5819-00096-1 event on 2012 Sep 09, 06:55 UT Visible from Central America Summary ------- On 2012 Sep 09 UT, the 151 km diameter asteroid (11) Parthenope will occult a 11.5 mag star in the constellation Aquarius for observers along a path across Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 9.1 mag (the magnitude of the asteroid) for at most 17.6 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: 99 * date and approx. time of event: 2012 Sep 09, 06:44 - 2012 Sep 09, 07:09 UT * geocentric midpoint of event [JD]: 2456179.78952083 * magnitude of target star: 11.5 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 17.6 * Moon: 43 % sunlit, 105° distance * Sun: 171° distance * rough path description: Central America The occultation path -------------------- * approximate projected width [km]: 151 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .030", 358° ) * approx speed of asteroid's shadow [km/s]: 8.5352 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5819-00096-1 by 11 Parthenope on 2012 Sep 9 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 160 0 0 -28 42 54 7 9 14 8 100 -1 -28 1 24 -29 24 22 -27 46 28 -29 39 17 161 0 0 -28 51 32 7 9 12 9 99 -2 -28 10 6 -29 32 57 -27 55 11 -29 47 51 162 0 0 -28 59 41 7 9 10 10 99 -2 -28 18 19 -29 41 2 -28 3 25 -29 55 55 163 0 0 -29 7 21 7 9 8 11 98 -3 -28 26 2 -29 48 38 -28 11 9 -30 3 30 164 0 0 -29 14 31 7 9 6 12 98 -4 -28 33 15 -29 55 45 -28 18 23 -30 10 36 165 0 0 -29 21 12 7 9 4 13 97 -5 -28 39 59 -30 2 23 -28 25 8 -30 17 13 166 0 0 -29 27 24 7 9 1 13 97 -6 -28 46 14 -30 8 33 -28 31 24 -30 23 21 167 0 0 -29 33 7 7 8 58 14 97 -7 -28 51 59 -30 14 14 -28 37 11 -30 29 1 168 0 0 -29 38 22 7 8 55 15 96 -8 -28 57 16 -30 19 26 -28 42 28 -30 34 13 169 0 0 -29 43 7 7 8 52 16 96 -9 -29 2 4 -30 24 9 -28 47 17 -30 38 55 170 0 0 -29 47 24 7 8 49 17 95 -9 -29 6 23 -30 28 25 -28 51 36 -30 43 10 171 0 0 -29 51 13 7 8 46 18 95 -10 -29 10 13 -30 32 12 -28 55 27 -30 46 57 172 0 0 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6 44 45 12 249 -20 27 56 30 26 29 11 28 12 14 26 13 29 - 36 0 0 27 32 27 6 44 43 11 250 -19 28 16 1 26 48 56 28 31 42 26 33 16 - 35 0 0 27 51 36 6 44 40 10 250 -18 28 35 2 27 8 11 28 50 41 26 52 33 - 34 0 0 28 10 15 6 44 38 9 250 -17 28 53 35 27 26 56 29 9 11 27 11 21 - 33 0 0 28 28 25 6 44 37 8 251 -16 29 11 38 27 45 13 29 27 12 27 29 40 - 32 0 0 28 46 5 6 44 35 7 251 -15 29 29 12 28 3 0 29 44 44 27 47 30 - 31 0 0 29 3 17 6 44 34 6 252 -14 29 46 17 28 20 18 30 1 46 28 4 50 - 30 0 0 29 19 59 6 44 32 5 252 -13 30 2 53 28 37 7 30 18 20 28 21 41 - 29 0 0 29 36 13 6 44 31 4 253 -12 30 19 0 28 53 27 30 34 25 28 38 3 - 28 0 0 29 51 56 6 44 31 4 253 -11 30 34 38 29 9 17 30 50 0 28 53 55 - 27 0 0 30 7 11 6 44 30 3 254 -10 30 49 46 29 24 37 31 5 7 29 9 18 - 26 0 0 30 21 57 6 44 30 2 254 -10 31 4 26 29 39 29 31 19 44 29 24 12 - 25 0 0 30 36 13 6 44 29 1 255 -9 31 18 36 29 53 51 31 33 52 29 38 36 Uncertainty in time = +/- 3 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 5819-00096-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 53 00.7484 DE: -12 39 02.134 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .028 ) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11) Parthenope approx. diameter [km]: 151 approx. diameter ["]: .170 distance from Earth [AU]: 1.22400 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 3901 number of rejected observations: 341 time covered by the observations: 1900 May 04 - 2012 Apr 19 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 72° remarks: * orbital elements for (11) Parthenope : Mean anomaly = 18.26060825 deg Arg. of pericenter = 195.16095740 deg Long. of node = 125.59686146 deg Inclination = 4.62610839 deg Eccentricity = 0.09880085 Semimajor axis = 2.45243221 AU Perihelion dist = 2.21012983 AU Mag: H = 6.55, G = 0.15 Epoch of elements : MJD 56179.28900000 TDT (2012 Sep 09.289) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 9 11 Parthenope 6h 56.9m UT 11.5 22 53 0.748-12 39 2.13TYC 5819-00096-1 12.1 9.1 151 17.6 1.224 -2.057 -17.05 -109.7066 -12.646 75.09 5.13 6.9485 -0.01603 0.03026 -4.19150 -2.37482 0.00040 0.00069 2000 15.8767662012 831.00000195.160957125.596861 4.6261080.09880085 2.4524322 2.2101298 6.6 5.00.15 RATE 2.5663060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.030 358 1.18 0.030 0 0 4-4 056129.0020120909_0096-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org