IOTA/IOTA-ES occultation update for (716) Berkeley / TYC 0760-02321-1 event on 2008 Jan 03, 00:34 UT Visible from Africa, Brazil, Peru Summary ------- On 2008 Jan 03 UT, the 21 km diameter asteroid (716) Berkeley will occult a 9.6 mag star in the constellation Gemini for observers along a path across Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.6 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: 34 * date and approx. time of event: 2008 Jan 03, 00:26 - 2008 Jan 03, 00:41 UT * magnitude of target star: 9.6 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 1.6 * Moon: 25 % sunlit, 116° distance * Sun: 171° distance * rough path description: Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.96 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .031", 90° ) * approx speed of asteroid's shadow [km/s]: 12.8170 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0760-02321-1 by 716 Berkeley 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 - 94 0 0 -12 17 6 0 41 38 1 76 0 -12 10 33 -12 23 40 .. .. .. -12 49 28 - 93 0 0 -12 2 37 0 41 37 2 75 -1 -11 56 4 -12 9 10 .. .. .. -12 34 56 - 92 0 0 -11 48 26 0 41 37 3 75 -2 -11 41 54 -11 54 59 .. .. .. -12 20 42 - 91 0 0 -11 34 34 0 41 36 4 75 -3 -11 28 2 -11 41 6 .. .. .. -12 6 47 - 90 0 0 -11 21 1 0 41 36 5 75 -4 -11 14 29 -11 27 32 -10 48 59 -11 53 12 - 89 0 0 -11 7 46 0 41 35 6 75 -5 -11 1 15 -11 14 18 -10 35 47 -11 39 55 - 88 0 0 -10 54 51 0 41 34 7 74 -6 -10 48 21 -11 1 22 -10 22 54 -11 26 58 - 87 0 0 -10 42 16 0 41 32 8 74 -7 -10 35 46 -10 48 46 -10 10 21 -11 14 20 - 86 0 0 -10 30 0 0 41 31 9 74 -8 -10 23 31 -10 36 30 - 9 58 8 -11 2 2 - 85 0 0 -10 18 4 0 41 30 10 74 -9 -10 11 35 -10 24 34 - 9 46 14 -10 50 4 - 84 0 0 -10 6 29 0 41 28 11 74 -10 -10 0 0 -10 12 57 - 9 34 41 -10 38 25 - 83 0 0 - 9 55 13 0 41 26 12 73 -11 - 9 48 45 -10 1 41 - 9 23 27 -10 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8 -35 39 37 -34 59 47 -36 6 7 66 0 0 -35 50 1 0 26 49 7 293 0 -35 43 17 -35 56 45 -35 16 58 -36 23 13 67 0 0 -36 6 57 0 26 48 6 292 0 -36 0 13 -36 13 41 -35 33 56 -36 40 7 68 0 0 -36 23 40 0 26 47 6 292 1 -36 16 57 -36 30 24 -35 50 42 -36 56 49 69 0 0 -36 40 11 0 26 46 5 291 2 -36 33 29 -36 46 54 -36 7 14 -37 13 18 70 0 0 -36 56 29 0 26 45 4 290 3 -36 49 47 -37 3 11 -36 23 34 -37 29 33 71 0 0 -37 12 33 0 26 45 3 290 4 -37 5 52 -37 19 15 -36 39 41 -37 45 35 72 0 0 -37 28 24 0 26 45 2 289 5 -37 21 43 -37 35 6 .. .. .. -38 1 24 73 0 0 -37 44 1 0 26 44 1 289 5 -37 37 20 -37 50 42 .. .. .. -38 16 59 74 0 0 -37 59 24 0 26 44 1 288 6 -37 52 44 -38 6 5 .. .. .. -38 32 19 Data for the target star ------------------------ * name: TYC 0760-02321-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 57 34.4522 DE: +13 50 09.095 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .021 ) * V mag [mag]: 9.6 * B mag [mag]: 9.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (716) Berkeley approx. diameter [km]: 21 approx. diameter ["]: .016 distance from Earth [AU]: 1.84500 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 812 number of rejected observations: 71 time covered by the observations: 1906 Jul 16 - 2007 Dec 06 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.022, 90° remarks: * orbital elements for (716) Berkeley : Mean anomaly = 273.32165506 deg Arg. of pericenter = 53.25249691 deg Long. of node = 146.28331471 deg Inclination = 8.49579678 deg Eccentricity = 0.08573928 Semimajor axis = 2.81334509 AU Perihelion dist = 2.57213092 AU Mag: H = 10.58, G = 0.15 Epoch of elements : MJD 54468.02400000 TDT (2008 Jan 03.024) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 716 Berkeley 0h 34.2m UT 9.6 6 57 34.452 13 50 9.10TYC 0760-02321-1 9.8 14.7 21 1.6 1.845 -2.304 7.91 -6.175 13.833 172.47 -22.90 0.5696 -.10060 -.42731 -7.04137 1.65949 -0.00017 0.00095 2000 271.64570720071226.00000 53.252497146.283315 8.4957970.085739282.813345092.5721309210.85 0.15 RATE 2.0886680 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.042 0.031 90.0 2.960 0.031 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org