IOTA/IOTA-ES occultation update for (13249) Marcallen / TYC 2397-00209-1 event on 2012 Nov 28, 22:23 UT Visible from China, India, Arabia, Africa Summary ------- On 2012 Nov 28 UT, the 20 km diameter asteroid (13249) Marcallen will occult a 10.3 mag star in the constellation Auriga for observers along a path across China, India, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.6 mag (the magnitude of the asteroid) for at most 2.1 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: 21 * date and approx. time of event: 2012 Nov 28, 22:13 - 2012 Nov 28, 22:34 UT * geocentric midpoint of event [JD]: 2456260.43316667 * magnitude of target star: 10.3 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 2.1 * Moon: 100 % sunlit, 17° distance * Sun: 162° distance * rough path description: China, India, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.15 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .087 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .088", .061", 99° ) * approx speed of asteroid's shadow [km/s]: 9.3966 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2397-00209-1 by 13249 Marcallen on 2012 Nov 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 - 29 0 0 -33 25 6 22 34 37 1 45 -19 -33 17 7 -33 33 7 .. .. .. -34 23 44 - 28 0 0 -32 34 46 22 34 37 2 44 -20 -32 26 45 -32 42 48 -31 36 24 -33 33 34 - 27 0 0 -31 43 41 22 34 36 3 44 -21 -31 35 38 -31 51 44 -30 45 9 -32 42 39 - 26 0 0 -30 51 51 22 34 35 5 43 -23 -30 43 47 -30 59 56 -29 53 11 -31 50 58 - 25 0 0 -29 59 20 22 34 34 6 43 -24 -29 51 15 -30 7 26 -29 0 32 -30 58 35 - 24 0 0 -29 6 9 22 34 32 7 42 -25 -28 58 4 -29 14 16 -28 7 15 -30 5 31 - 23 0 0 -28 12 21 22 34 30 8 42 -26 -28 4 15 -28 20 28 -27 13 22 -29 11 48 - 22 0 0 -27 17 59 22 34 28 10 41 -28 -27 9 52 -27 26 6 -26 18 55 -28 17 29 - 21 0 0 -26 23 3 22 34 25 11 41 -29 -26 14 56 -26 31 11 -25 23 57 -27 22 37 - 20 0 0 -25 27 38 22 34 22 12 41 -30 -25 19 30 -25 35 46 -24 28 30 -26 27 13 - 19 0 0 -24 31 46 22 34 18 13 40 -31 -24 23 38 -24 39 54 -23 32 38 -25 31 22 - 18 0 0 -23 35 29 22 34 15 15 40 -33 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22 14 3 26 300 -11 22 15 8 22 2 56 22 53 26 21 24 27 111 0 0 21 46 12 22 13 58 25 300 -10 21 52 20 21 40 5 22 30 49 21 1 24 112 0 0 21 22 34 22 13 53 24 301 -9 21 28 43 21 16 25 22 7 24 20 37 33 113 0 0 20 58 7 22 13 48 23 301 -8 21 4 18 20 51 56 21 43 11 20 12 52 114 0 0 20 32 51 22 13 43 22 301 -7 20 39 4 20 26 38 21 18 9 19 47 21 115 0 0 20 6 45 22 13 39 21 302 -6 20 13 0 20 0 30 20 52 17 19 21 0 116 0 0 19 39 48 22 13 34 20 302 -5 19 46 5 19 33 31 20 25 35 18 53 48 117 0 0 19 12 0 22 13 30 19 302 -4 19 18 19 19 5 41 19 58 3 18 25 45 118 0 0 18 43 21 22 13 26 18 303 -3 18 49 42 18 36 59 19 29 39 17 56 49 119 0 0 18 13 49 22 13 22 17 303 -2 18 20 12 18 7 25 19 0 23 17 27 0 120 0 0 17 43 24 22 13 19 15 303 -1 17 49 50 17 36 58 18 30 15 16 56 19 Uncertainty in time = +/- 9 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2397-00209-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 11 59.1004 DE: +35 37 08.961 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .018 ) * V mag [mag]: 10.3 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13249) Marcallen approx. diameter [km]: 20 approx. diameter ["]: .022 distance from Earth [AU]: 1.27400 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 641 number of rejected observations: 7 time covered by the observations: 1952 Jan 25 - 2012 Nov 04 1 sigma uncertainty ellipse (major, minor, PA): 0.086, 0.058, 99° remarks: * orbital elements for (13249) Marcallen : Mean anomaly = 10.30992094 deg Arg. of pericenter = 134.48878565 deg Long. of node = 284.31092251 deg Inclination = 14.04282752 deg Eccentricity = 0.16917627 Semimajor axis = 2.67411838 AU Perihelion dist = 2.22172100 AU Mag: H = 11.79, G = 0.15 Epoch of elements : MJD 56259.93300000 TDT (2012 Nov 28.933) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 28 13249 Marcallen 22h 23.8m UT 10.3 5 11 59.100 35 37 8.96TYC 2397-00209-1 10.6 14.6 20 2.1 1.274 -2.667 -16.87 33.8377 35.623 -158.87 -21.49 22.3960 0.12621 -0.24401 -4.70843 -2.44136 -0.00117 -0.00130 2000 8.07113020121119.00000134.488786284.310923 14.0428280.16917627 2.6741184 2.221721011.8 5.00.15 RATE 2.2538920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.088 0.061 99 4.15 0.068 0 0 4 1 056247.0020121128_0209-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 09:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org