IOTA/IOTA-ES occultation update for (2152) Hannibal / TYC 0772-01735-1 event on 2012 Dec 05, 21:16 UT Visible from Russia, SW Asia, Africa Summary ------- On 2012 Dec 05 UT, the 40 km diameter asteroid (2152) Hannibal will occult a 11.3 mag star in the constellation Canis Minor for observers along a path across Russia, SW Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 15.1 mag (the magnitude of the asteroid) for at most 4.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 39 * date and approx. time of event: 2012 Dec 05, 21:06 - 2012 Dec 05, 21:24 UT * geocentric midpoint of event [JD]: 2456267.38589583 * magnitude of target star: 11.3 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 4.4 * Moon: 58 % sunlit, 42° distance * Sun: 140° distance * rough path description: Russia, SW Asia, Africa The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 1.68 * 1 sigma uncertainty interval [seconds]: +/- 7.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .043", 103° ) * approx speed of asteroid's shadow [km/s]: 9.0475 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0772-01735-1 by 2152 Hannibal on 2012 Dec 5 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 ' " Longitude Longitude Longitude Longitude - 10 52 10 6 0 0 21 24 38 3 78 -41 - 11 50 26 - 9 56 39 ... .. .. - 7 6 6 - 7 18 23 7 0 0 21 24 32 7 79 -45 - 8 7 32 - 6 30 53 - 11 7 42 - 4 1 22 Latitude Latitude Latitude Latitude - 7 0 0 7 5 39 21 24 32 7 79 -45 7 20 25 6 50 56 8 10 28 6 1 52 - 6 0 0 7 24 36 21 24 29 8 79 -46 7 39 26 7 9 50 8 29 41 6 20 35 - 5 0 0 7 44 23 21 24 27 9 79 -47 7 59 16 7 29 33 8 49 43 6 40 8 - 4 0 0 8 4 59 21 24 24 10 79 -48 8 19 56 7 50 6 9 10 34 7 0 28 - 3 0 0 8 26 24 21 24 21 11 80 -49 8 41 24 8 11 27 9 32 16 7 21 37 - 2 0 0 8 48 37 21 24 17 12 80 -50 9 3 41 8 33 36 9 54 46 7 43 34 - 1 0 0 9 11 39 21 24 13 13 80 -51 9 26 48 8 56 34 10 18 7 8 6 19 0 0 0 9 35 30 21 24 9 15 80 -53 9 50 43 9 20 21 10 42 16 8 29 52 1 0 0 10 0 9 21 24 5 16 80 -54 10 15 26 9 44 56 11 7 15 8 54 13 2 0 0 10 25 37 21 24 0 17 81 -55 10 40 59 10 10 19 11 33 3 9 19 21 3 0 0 10 51 53 21 23 55 18 81 -56 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Uncertainty in time = +/- 8 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0772-01735-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 31 47.4083 DE: +11 50 22.872 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .030 ) * V mag [mag]: 11.3 * B mag [mag]: 12.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2152) Hannibal approx. diameter [km]: 40 approx. diameter ["]: .029 distance from Earth [AU]: 1.90600 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 909 number of rejected observations: 15 time covered by the observations: 1939 Sep 14 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.031, 108° remarks: * orbital elements for (2152) Hannibal : Mean anomaly = 45.07956321 deg Arg. of pericenter = 142.67248935 deg Long. of node = 250.94750294 deg Inclination = 13.96759245 deg Eccentricity = 0.22093488 Semimajor axis = 3.12715884 AU Perihelion dist = 2.43626039 AU Mag: H = 10.75, G = 0.15 Epoch of elements : MJD 56266.88600000 TDT (2012 Dec 05.886) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 5 2152 Hannibal 21h 15.7m UT 11.3 7 31 47.408 11 50 22.87TYC 0772-01735-1 12.6 15.1 40 4.4 1.906 -1.317 -13.49 78.9534 11.844 -141.18 -22.50 21.2615 -0.37025 0.52930 -4.18611 -2.92478 -0.00356 0.00136 2000 43.85227620121129.00000142.672489250.947503 13.9675920.22093488 3.1271588 2.436260410.7 5.00.15 RATE 1.7822930 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.053 0.043 103 2.68 0.049 0 0 3 2 056264.0020121205_1735-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org