IOTA/IOTA-ES occultation update for (976) Benjamina / UCAC2 26000295 event on 2008 Jan 01, 19:48 UT Visible from Australia Summary ------- On 2008 Jan 01 UT, the 80 km diameter asteroid (976) Benjamina will occult a 11.5 mag star in the constellation Virgo for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.9 mag (the magnitude of the asteroid) for at most 3.2 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: 81 * date and approx. time of event: 2008 Jan 01, 19:44 - 2008 Jan 01, 19:52 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 3.2 * Moon: 37 % sunlit, 2° distance * Sun: 75° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 97° ) * approx speed of asteroid's shadow [km/s]: 25.2891 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26000295 by 976 Benjamina on 2008 Jan 01 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 7 9 58 19 44 42 0 106 -70 6 46 16 7 33 37 6 15 21 .. .. .. 78 0 0 6 52 24 19 44 43 1 106 -69 6 28 38 7 16 6 5 57 39 .. .. .. 79 0 0 6 34 18 19 44 43 2 106 -69 6 10 29 6 58 4 5 39 26 .. .. .. 80 0 0 6 15 41 19 44 43 3 106 -68 5 51 48 6 39 31 5 20 41 7 10 24 81 0 0 5 56 34 19 44 43 4 107 -67 5 32 37 6 20 27 5 1 25 6 51 25 82 0 0 5 36 55 19 44 44 5 107 -66 5 12 55 6 0 52 4 41 38 6 31 54 83 0 0 5 16 46 19 44 44 6 107 -65 4 52 42 5 40 46 4 21 20 6 11 53 84 0 0 4 56 6 19 44 45 7 107 -64 4 31 59 5 20 10 4 0 32 5 51 22 85 0 0 4 34 56 19 44 45 9 107 -63 4 10 44 4 59 3 3 39 13 5 30 21 86 0 0 4 13 15 19 44 46 10 107 -62 3 49 0 4 37 27 3 17 23 5 8 49 87 0 0 3 51 5 19 44 47 11 107 -61 3 26 46 4 15 20 2 55 4 4 46 47 88 0 0 3 28 24 19 44 48 12 107 -60 3 4 1 3 52 44 2 32 14 4 24 16 89 0 0 3 5 14 19 44 49 13 107 -59 2 40 47 3 29 38 2 8 55 4 1 15 90 0 0 2 41 35 19 44 50 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65 -41 35 6 -40 46 57 -42 6 31 -40 15 46 - 96 0 0 -40 54 40 19 52 44 2 251 65 -41 18 50 -40 30 34 -41 50 20 -39 59 18 - 95 0 0 -40 37 55 19 52 44 1 250 64 -41 2 8 -40 13 45 -41 33 43 -39 42 24 - 94 0 0 -40 20 44 19 52 44 1 249 64 -40 45 1 -39 56 30 -41 16 41 -39 25 4 - 93 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -40 59 13 .. .. .. Data for the target star ------------------------ * name: UCAC2 26000295 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 26 50.4151 DE: -15 53 01.544 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (976) Benjamina approx. diameter [km]: 80 approx. diameter ["]: .037 distance from Earth [AU]: 3.00200 * orbital information: orbit source: Preston date of fit: 2007 Nov 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 878 number of rejected observations: 59 time covered by the observations: 1929 Jul 06 - 2007 Apr 22 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.012, 107° remarks: * orbital elements for (976) Benjamina : Mean anomaly = 351.76715198 deg Arg. of pericenter = 311.72521348 deg Long. of node = 244.82923593 deg Inclination = 7.65484617 deg Eccentricity = 0.09535806 Semimajor axis = 3.20473630 AU Perihelion dist = 2.89913887 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 54466.82600000 TDT (2008 Jan 01.826) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 01 976 Benjamina 19h 48.7m UT 11.5 13 26 50.415-15 53 1.54UCAC2 26000295 0.0 14.9 80 3.2 3.002 2.633 -17.45 163.686 -15.879 243.69 -23.00 19.8121 -.12284 -.26939 12.97102 -5.95790 -0.00543 0.00199 2000 350.59446520071226.00000311.725213244.829236 7.6548460.095358063.204736302.899138879.225 0.15 RATE 1.7179700 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.024 96.8 1.650 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 03:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org