IOTA/IOTA-ES occultation update for (671) Carnegia / TYC 1771-01088-1 event on 2012 Dec 15, 19:47 UT Visible from Africa Summary ------- On 2012 Dec 15 UT, the 59 km diameter asteroid (671) Carnegia will occult a 9.9 mag star in the constellation Aries for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 14.9 mag (the magnitude of the asteroid) for at most 10.0 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: 81 * date and approx. time of event: 2012 Dec 15, 19:33 - 2012 Dec 15, 20:01 UT * geocentric midpoint of event [JD]: 2456277.3254375 * magnitude of target star: 9.9 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 10.0 * Moon: 9 % sunlit, 104° distance * Sun: 139° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 8.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .026", 70° ) * approx speed of asteroid's shadow [km/s]: 5.9094 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1771-01088-1 by 671 Carnegia on 2012 Dec 15 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 - 15 0 0 -32 2 45 20 1 56 27 29 -1 -31 37 15 -32 28 24 -31 3 49 -33 2 32 - 14 0 0 -31 15 29 20 1 45 28 28 -2 -30 50 4 -31 41 3 -30 16 46 -32 15 3 - 13 0 0 -30 28 11 20 1 33 29 28 -3 -30 2 51 -30 53 39 -29 29 40 -31 27 32 - 12 0 0 -29 40 52 20 1 21 30 27 -4 -29 15 38 -30 6 14 -28 42 34 -30 39 59 - 11 0 0 -28 53 34 20 1 8 31 26 -5 -28 28 27 -29 18 51 -27 55 31 -29 52 27 - 10 0 0 -28 6 20 20 0 55 32 25 -6 -27 41 19 -28 31 30 -27 8 32 -29 4 58 - 9 0 0 -27 19 12 20 0 42 34 25 -7 -26 54 18 -27 44 15 -26 21 39 -28 17 34 - 8 0 0 -26 32 11 20 0 28 35 24 -9 -26 7 24 -26 57 7 -25 34 53 -27 30 16 - 7 0 0 -25 45 20 20 0 14 36 23 -10 -25 20 39 -26 10 9 -24 48 18 -26 43 8 - 6 0 0 -24 58 39 19 59 59 37 23 -11 -24 34 6 -25 23 21 -24 1 54 -25 56 11 - 5 0 0 -24 12 12 19 59 44 38 22 -12 -23 47 45 -24 36 46 -23 15 43 -25 9 26 - 4 0 0 -23 25 59 19 59 28 39 21 -13 -23 1 40 -23 50 26 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Uncertainty in time = +/- 10 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1771-01088-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 33 50.6701 DE: +24 50 14.907 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .019 ) * V mag [mag]: 9.9 * B mag [mag]: 10.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (671) Carnegia approx. diameter [km]: 59 approx. diameter ["]: .039 distance from Earth [AU]: 2.10400 * orbital information: orbit source: Preston date of fit: 2012 Oct 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1042 number of rejected observations: 71 time covered by the observations: 1914 Nov 09 - 2012 Sep 09 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 65° remarks: * orbital elements for (671) Carnegia : Mean anomaly = 327.89205026 deg Arg. of pericenter = 92.75767263 deg Long. of node = 0.71091882 deg Inclination = 8.02606359 deg Eccentricity = 0.06880049 Semimajor axis = 3.09536374 AU Perihelion dist = 2.88240119 AU Mag: H = 10.16, G = 0.15 Epoch of elements : MJD 56276.82500000 TDT (2012 Dec 15.825) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 15 671 Carnegia 19h 48.6m UT 9.9 2 33 50.670 24 50 14.91TYC 1771-01088-1 10.5 14.9 59 10.0 2.104 -0.893 -6.78 16.4359 24.839 -118.28 -23.31 19.8105 0.24402 -0.43281 -2.91355 -1.62372 0.00393 0.00053 2000 326.656845201212 9.00000 92.757673 0.710919 8.0260640.06880049 3.0953637 2.882401210.2 5.00.15 RATE 1.8098240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.026 70 1.66 0.026 0 0 1-3 056264.0020121215_1088-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 23:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org