IOTA/IOTA-ES occultation update for (2252) CERGA / TYC 1892-00151-1 event on 2009 Jan 06, 22:41 UT Visible from Summary ------- On 2009 Jan 06 UT, the 14 km diameter asteroid (2252) CERGA will occult a 9.7 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.3 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 11 * date and approx. time of event: 2009 Jan 06, 22:32 - 2009 Jan 06, 22:50 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 1.2 * Moon: 76 % sunlit, 51° distance * Sun: 170° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 5.82 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .096 +/- .070) * 1 sigma uncertainty ellipse (major, minor, PA): ( .096", .070", 95° ) * approx speed of asteroid's shadow [km/s]: 11.2620 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1892-00151-1 by 2252 CERGA on 2009 Jan 6 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 - 77 0 0 16 41 20 22 50 39 10 62 -1 16 45 50 16 36 50 17 38 19 15 44 34 - 76 0 0 17 15 10 22 50 37 11 62 -2 17 19 40 17 10 40 18 12 7 16 18 26 - 75 0 0 17 48 49 22 50 35 12 62 -3 17 53 19 17 44 20 18 45 45 16 52 8 - 74 0 0 18 22 17 22 50 32 13 63 -4 18 26 47 18 17 48 19 19 10 17 25 38 - 73 0 0 18 55 32 22 50 30 14 63 -5 19 0 1 18 51 3 19 52 22 17 58 56 - 72 0 0 19 28 33 22 50 27 15 63 -6 19 33 2 19 24 5 20 25 20 18 32 1 - 71 0 0 20 1 20 22 50 24 16 64 -8 20 5 49 19 56 52 20 58 4 19 4 51 - 70 0 0 20 33 52 22 50 21 17 64 -9 20 38 21 20 29 24 21 30 32 19 37 27 - 69 0 0 21 6 8 22 50 17 18 64 -10 21 10 36 21 1 40 22 2 44 20 9 47 - 68 0 0 21 38 8 22 50 14 19 65 -11 21 42 35 21 33 40 22 34 39 20 41 50 - 67 0 0 22 9 50 22 50 10 21 65 -12 22 14 17 22 5 22 23 6 16 21 13 37 - 66 0 0 22 41 14 22 50 6 22 66 -13 22 45 41 22 36 47 23 37 35 21 45 6 - 65 0 0 23 12 19 22 50 2 23 66 -14 23 16 46 23 7 52 24 8 36 22 16 16 - 64 0 0 23 43 5 22 49 58 24 66 -15 23 47 31 23 38 39 24 39 16 22 47 7 - 63 0 0 24 13 31 22 49 54 25 67 -16 24 17 57 24 9 5 25 9 37 23 17 39 - 62 0 0 24 43 37 22 49 50 26 67 -17 24 48 2 24 39 12 25 39 37 23 47 50 - 61 0 0 25 13 22 22 49 45 27 68 -18 25 17 47 25 8 57 26 9 16 24 17 41 - 60 0 0 25 42 45 22 49 40 28 68 -19 25 47 9 25 38 21 26 38 33 24 47 11 - 59 0 0 26 11 47 22 49 35 29 69 -20 26 16 10 26 7 23 27 7 28 25 16 18 - 58 0 0 26 40 26 22 49 31 30 69 -21 26 44 49 26 36 2 27 36 1 25 45 4 - 57 0 0 27 8 42 22 49 25 31 70 -22 27 13 5 27 4 19 28 4 10 26 13 27 - 56 0 0 27 36 35 22 49 20 32 70 -23 27 40 58 27 32 13 28 31 57 26 41 27 - 55 0 0 28 4 5 22 49 15 33 71 -24 28 8 27 27 59 43 28 59 20 27 9 4 - 54 0 0 28 31 11 22 49 10 34 71 -25 28 35 32 28 26 50 29 26 19 27 36 17 - 53 0 0 28 57 53 22 49 4 35 72 -25 29 2 14 28 53 32 29 52 53 28 3 6 - 52 0 0 29 24 11 22 48 59 35 73 -26 29 28 31 29 19 51 30 19 3 28 29 31 - 51 0 0 29 50 3 22 48 53 36 73 -27 29 54 23 29 45 44 30 44 49 28 55 31 - 50 0 0 30 15 31 22 48 47 37 74 -28 30 19 50 30 11 13 31 10 9 29 21 6 - 49 0 0 30 40 34 22 48 41 38 74 -29 30 44 53 30 36 16 31 35 5 29 46 17 - 48 0 0 31 5 12 22 48 35 39 75 -30 31 9 30 31 0 55 31 59 35 30 11 2 - 47 0 0 31 29 25 22 48 29 40 76 -31 31 33 42 31 25 8 32 23 40 30 35 22 - 46 0 0 31 53 12 22 48 23 41 76 -32 31 57 28 31 48 55 32 47 19 30 59 17 - 45 0 0 32 16 33 22 48 17 42 77 -33 32 20 49 32 12 17 33 10 32 31 22 46 - 44 0 0 32 39 28 22 48 11 43 78 -34 32 43 43 32 35 13 33 33 20 31 45 49 - 43 0 0 33 1 58 22 48 5 44 78 -34 33 6 13 32 57 44 33 55 41 32 8 27 - 42 0 0 33 24 2 22 47 58 44 79 -35 33 28 16 33 19 48 34 17 37 32 30 38 - 41 0 0 33 45 40 22 47 52 45 80 -36 33 49 53 33 41 26 34 39 7 32 52 24 - 40 0 0 34 6 52 22 47 45 46 81 -37 34 11 4 34 2 39 35 0 11 33 13 44 - 39 0 0 34 27 38 22 47 39 47 81 -38 34 31 50 34 23 26 35 20 49 33 34 38 - 38 0 0 34 47 57 22 47 33 48 82 -39 34 52 9 34 43 46 35 41 2 33 55 5 - 37 0 0 35 7 51 22 47 26 49 83 -39 35 12 2 35 3 41 36 0 48 34 15 7 - 36 0 0 35 27 19 22 47 19 50 84 -40 35 31 30 35 23 9 36 20 8 34 34 43 - 35 0 0 35 46 22 22 47 13 50 85 -41 35 50 31 35 42 12 36 39 2 34 53 52 - 34 0 0 36 4 58 22 47 6 51 86 -42 36 9 7 36 0 49 36 57 31 35 12 36 - 33 0 0 36 23 8 22 46 59 52 86 -42 36 27 17 36 19 0 37 15 34 35 30 54 - 32 0 0 36 40 53 22 46 53 53 87 -43 36 45 1 36 36 45 37 33 11 35 48 46 - 31 0 0 36 58 12 22 46 46 54 88 -44 37 2 19 36 54 4 37 50 22 36 6 12 - 30 0 0 37 15 5 22 46 39 54 89 -45 37 19 11 37 10 58 38 7 8 36 23 13 - 29 0 0 37 31 32 22 46 32 55 90 -46 37 35 39 37 27 26 38 23 28 36 39 48 - 28 0 0 37 47 35 22 46 25 56 91 -46 37 51 40 37 43 29 38 39 23 36 55 57 - 27 0 0 38 3 12 22 46 19 57 92 -47 38 7 17 37 59 7 38 54 53 37 11 41 - 26 0 0 38 18 23 22 46 12 57 93 -48 38 22 28 38 14 19 39 9 58 37 26 59 - 25 0 0 38 33 10 22 46 5 58 94 -48 38 37 13 38 29 6 39 24 37 37 41 53 - 24 0 0 38 47 31 22 45 58 59 95 -49 38 51 34 38 43 28 39 38 52 37 56 21 - 23 0 0 39 1 27 22 45 51 60 97 -50 39 5 30 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30 8 299 -13 15 12 4 15 3 3 16 4 35 14 10 45 106 0 0 14 33 12 22 32 28 7 299 -12 14 37 43 14 28 42 15 30 15 13 36 24 107 0 0 13 58 45 22 32 27 6 299 -11 14 3 15 13 54 15 14 55 48 13 1 56 108 0 0 13 24 13 22 32 26 5 300 -10 13 28 43 13 19 42 14 21 15 12 27 24 109 0 0 12 49 36 22 32 25 3 300 -9 12 54 6 12 45 5 13 46 38 .. .. .. 110 0 0 12 14 55 22 32 25 2 300 -8 12 19 26 12 10 25 13 11 57 .. .. .. 111 0 0 11 40 13 22 32 24 1 300 -7 11 44 43 11 35 43 12 37 13 .. .. .. 112 0 0 11 5 29 22 32 24 0 300 -5 11 9 59 11 1 0 12 2 28 .. .. .. Uncertainty in time = +/- 10 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 1892-00151-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 40 56.3820 DE: +29 45 22.257 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .025 ) * V mag [mag]: 9.7 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2252) CERGA approx. diameter [km]: 14 approx. diameter ["]: .012 distance from Earth [AU]: 1.59200 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: MPC (via Astdys) number of used observations: 826 number of rejected observations: 24 time covered by the observations: 1949 Dec 28 - 2008 Jan 12 1 sigma uncertainty ellipse (major, minor, PA): 0.095, 0.065, 95° remarks: * orbital elements for (2252) CERGA : Mean anomaly = 70.17778403 deg Arg. of pericenter = 25.25999530 deg Long. of node = 358.49807145 deg Inclination = 4.22459766 deg Eccentricity = 0.07144842 Semimajor axis = 2.61689545 AU Perihelion dist = 2.42992240 AU Mag: H = 12.43, G = 0.15 Epoch of elements : MJD 54837.94600000 TDT (2009 Jan 06.946) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 6 2252 CERGA 22h 41.6m UT 9.7 6 40 56.382 29 45 22.26TYC 1892-00151-1 10.4 15.3 14 1.2 1.592 -2.696 0.21 13.1958 29.756 -158.86 -22.39 22.6933 0.00126 0.22584 -6.35647 0.03969 0.00077 -0.00073 2000 68.32777820081230.00000 25.259995358.498071 4.2245980.07144842 2.6168955 2.429922411.9 5.00.15 RATE 2.3282230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.096 0.070 95 6.82 0.071 0 54774.5020090106_0151-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org