IOTA/IOTA-ES occultation update for (6) Hebe / TYC 0331-00483-1 event on 2009 Jun 05, 05:57 UT Visible from Summary ------- On 2009 Jun 05 UT, the 185 km diameter asteroid (6) Hebe will occult a 12.0 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 10.2 mag (the magnitude of the asteroid) for at most 20.4 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: 99 * date and approx. time of event: 2009 Jun 05, 05:46 - 2009 Jun 05, 06:05 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 20.4 * Moon: 94 % sunlit, 27° distance * Sun: 136° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 224 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .025", 2° ) * approx speed of asteroid's shadow [km/s]: 9.0770 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0331-00483-1 by 6 Hebe on 2009 Jun 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 ' " Latitude Latitude Latitude Latitude 153 0 0 -48 57 19 6 5 51 1 79 -2 -47 55 48 -49 59 36 -47 31 24 -50 24 44 154 0 0 -48 49 54 6 5 51 1 78 -2 -47 48 20 -49 52 15 -47 23 54 -50 17 25 155 0 0 -48 42 17 6 5 50 2 78 -3 -47 40 38 -49 44 42 -47 16 11 -50 9 53 156 0 0 -48 34 25 6 5 50 3 77 -3 -47 32 43 -49 36 55 -47 8 14 -50 2 8 157 0 0 -48 26 21 6 5 50 3 76 -4 -47 24 35 -49 28 54 -47 0 5 -49 54 10 158 0 0 -48 18 4 6 5 49 4 75 -4 -47 16 13 -49 20 41 -46 51 41 -49 45 58 159 0 0 -48 9 33 6 5 48 5 75 -5 -47 7 38 -49 12 14 -46 43 5 -49 37 33 160 0 0 -48 0 49 6 5 47 5 74 -5 -46 58 50 -49 3 35 -46 34 15 -49 28 55 161 0 0 -47 51 52 6 5 46 6 73 -6 -46 49 49 -48 54 42 -46 25 13 -49 20 4 162 0 0 -47 42 42 6 5 45 7 72 -6 -46 40 35 -48 45 36 -46 15 57 -49 11 0 163 0 0 -47 33 19 6 5 44 7 72 -7 -46 31 8 -48 36 17 -46 6 28 -49 1 43 164 0 0 -47 23 43 6 5 43 8 71 -7 -46 21 27 -48 26 46 -45 56 46 -48 52 13 165 0 0 -47 13 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-20 12 58 -17 46 1 -20 37 53 - 35 0 0 -19 17 31 5 46 33 2 278 -42 -18 16 28 -20 19 19 -17 52 15 -20 44 15 - 34 0 0 -19 24 8 5 46 33 1 277 -41 -18 23 2 -20 25 59 -17 58 48 -20 50 57 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0331-00483-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 38 14.8125 DE: +06 43 14.562 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 12.0 * B mag [mag]: 12.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6) Hebe approx. diameter [km]: 185 approx. diameter ["]: .128 distance from Earth [AU]: 1.99800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 4795 number of rejected observations: 362 time covered by the observations: 1900 Jun 11 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 106° remarks: * orbital elements for (6) Hebe : Mean anomaly = 223.89106782 deg Arg. of pericenter = 239.48981885 deg Long. of node = 138.73999712 deg Inclination = 14.75404134 deg Eccentricity = 0.20237684 Semimajor axis = 2.42453607 AU Perihelion dist = 1.93386613 AU Mag: H = 5.70, G = 0.24 Epoch of elements : MJD 54987.24800000 TDT (2009 Jun 05.248) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 5 6 Hebe 5h 56.2m UT 12.0 14 38 14.813 6 43 14.56TYC 0331-00483-1 12.8 10.2 185 20.4 1.998 -1.462 -5.80 -123.2910 6.722 90.57 22.56 5.9369 0.14446 -0.54575 -4.95175 -1.31464 0.00286 -0.00261 2000 221.9988152009 529.00000239.489819138.739997 14.7540410.20237684 2.4245361 1.9338661 5.7 5.00.24 RATE 2.6107240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.025 2 1.20 0.025 0 54545.5020090605_0483-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org