IOTA/IOTA-ES occultation update for (184) Dejopeja / UCAC2 39839867 event on 2008 Jan 03, 23:10 UT Visible from S Africa Summary ------- On 2008 Jan 03 UT, the 66 km diameter asteroid (184) Dejopeja will occult a 11.8 mag star in the constellation Gemini for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.7 mag (the magnitude of the asteroid) for at most 5.2 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: 78 * date and approx. time of event: 2008 Jan 03, 23:04 - 2008 Jan 03, 23:16 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 5.2 * Moon: 18 % sunlit, 119° distance * Sun: 170° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.71 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .030", 3° ) * approx speed of asteroid's shadow [km/s]: 12.6016 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39839867 by 184 Dejopeja on 2008 Jan 03 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 - 51 0 0 -32 36 47 23 16 56 0 63 -8 .. .. .. -33 5 30 .. .. .. .. .. .. - 50 0 0 -32 11 6 23 16 56 1 62 -9 -31 42 46 -32 39 42 .. .. .. -33 20 47 - 49 0 0 -31 45 47 23 16 56 2 62 -10 -31 17 33 -32 14 17 .. .. .. -32 55 12 - 48 0 0 -31 20 50 23 16 55 3 61 -11 -30 52 43 -31 49 13 .. .. .. -32 29 58 - 47 0 0 -30 56 16 23 16 55 4 61 -12 -30 28 15 -31 24 32 .. .. .. -32 5 8 - 46 0 0 -30 32 5 23 16 54 5 60 -13 -30 4 10 -31 0 15 .. .. .. -31 40 41 - 45 0 0 -30 8 18 23 16 53 6 60 -14 -29 40 29 -30 36 21 -29 1 25 -31 16 38 - 44 0 0 -29 44 55 23 16 51 7 59 -15 -29 17 13 -30 12 52 -28 38 17 -30 53 0 - 43 0 0 -29 21 58 23 16 50 8 59 -16 -28 54 22 -29 49 48 -28 15 34 -30 29 47 - 42 0 0 -28 59 26 23 16 48 9 58 -17 -28 31 56 -29 27 10 -27 53 16 -30 7 0 - 41 0 0 -28 37 20 23 16 46 10 58 -18 -28 9 56 -29 4 58 -27 31 24 -29 44 39 - 40 0 0 -28 15 40 23 16 44 11 57 -19 -27 48 22 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Data for the target star ------------------------ * name: UCAC2 39839867 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 40 56.5977 DE: +22 33 47.601 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .026 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (184) Dejopeja approx. diameter [km]: 66 approx. diameter ["]: .043 distance from Earth [AU]: 2.11500 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 945 number of rejected observations: 109 time covered by the observations: 1903 Sep 01 - 2007 Dec 06 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 100° remarks: * orbital elements for (184) Dejopeja : Mean anomaly = 297.41343514 deg Arg. of pericenter = 208.03604026 deg Long. of node = 332.45244897 deg Inclination = 1.14638048 deg Eccentricity = 0.07543588 Semimajor axis = 3.18285727 AU Perihelion dist = 2.94275562 AU Mag: H = 8.36, G = 0.15 Epoch of elements : MJD 54468.96600000 TDT (2008 Jan 03.966) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 184 Dejopeja 23h 11.0m UT 11.8 7 40 56.598 22 33 47.60UCAC2 39839867 0.0 12.7 66 5.2 2.115 -2.109 4.65 24.544 22.561 193.38 -22.81 23.1826 -.11046 -.69470 -7.02418 1.11874 -0.00111 0.00007 2000 295.85719320071226.00000208.036040332.452449 1.1463800.075435883.182857272.942755628.315 0.15 RATE 1.7357140 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.030 2.7 1.710 0.031 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org