IOTA/IOTA-ES occultation update for (770) Bali / 2UCAC 21353937 event on 2008 May 17, 01:45 UT Visible from S Australia, Madagascar Summary ------- On 2008 May 17 UT, the 16 km diameter asteroid (770) Bali will occult a 11.9 mag star in the constellation Ophiuchus for observers along a path across S Australia, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.5 mag (the magnitude of the asteroid) for at most 1.5 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: 26 * date and approx. time of event: 2008 May 17, 16:39 - 2008 May 17, 16:57 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 1.5 * Moon: 95 % sunlit, 45° distance * Sun: 161° distance * rough path description: S Australia, Madagascar The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 2.57 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .036", 94° ) * approx speed of asteroid's shadow [km/s]: 10.8038 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 21353937 by 770 Bali on 2008 May 17 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 30 0 0 -10 15 10 16 57 55 1 116 -18 -10 10 18 -10 20 2 - 9 45 17 -10 45 6 31 0 0 -10 44 4 16 57 55 2 116 -19 -10 39 12 -10 48 57 -10 14 12 -11 14 0 32 0 0 -11 12 53 16 57 54 3 116 -20 -11 8 1 -11 17 45 -10 43 1 -11 42 48 33 0 0 -11 41 35 16 57 53 4 115 -21 -11 36 43 -11 46 27 -11 11 44 -12 11 29 34 0 0 -12 10 10 16 57 53 5 115 -22 -12 5 19 -12 15 2 -11 40 20 -12 40 3 35 0 0 -12 38 38 16 57 51 6 115 -23 -12 33 46 -12 43 29 -12 8 48 -13 8 29 36 0 0 -13 6 56 16 57 50 7 115 -24 -13 2 5 -13 11 48 -12 37 8 -13 36 47 37 0 0 -13 35 6 16 57 49 8 114 -25 -13 30 15 -13 39 57 -13 5 19 -14 4 55 38 0 0 -14 3 5 16 57 47 9 114 -26 -13 58 14 -14 7 56 -13 33 20 -14 32 53 39 0 0 -14 30 54 16 57 45 10 114 -27 -14 26 4 -14 35 45 -14 1 10 -15 0 41 40 0 0 -14 58 32 16 57 43 11 114 -28 -14 53 42 -15 3 23 -14 28 50 -15 28 17 41 0 0 -15 25 58 16 57 41 12 113 -29 -15 21 8 -15 30 49 -14 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-5 -16 3 1 -16 12 40 -15 38 14 -16 37 29 -159 0 0 -15 40 55 16 39 14 23 248 -4 -15 36 6 -15 45 45 -15 11 17 -16 10 36 -158 0 0 -15 13 48 16 39 10 22 248 -3 -15 8 58 -15 18 38 -14 44 8 -15 43 30 -157 0 0 -14 46 29 16 39 6 20 248 -2 -14 41 38 -14 51 19 -14 16 47 -15 16 12 -156 0 0 -14 18 58 16 39 2 19 248 0 -14 14 8 -14 23 49 -13 49 15 -14 48 43 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: 2UCAC 21353937 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 57 34.7285 DE: -25 32 59.622 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .031 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (770) Bali approx. diameter [km]: 16 approx. diameter ["]: .014 distance from Earth [AU]: 1.57700 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 791 number of rejected observations: 87 time covered by the observations: 1903 Oct 20 - 2008 Apr 30 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.019, 100° remarks: * orbital elements for (770) Bali : Mean anomaly = 188.00545251 deg Arg. of pericenter = 17.70312089 deg Long. of node = 44.80420950 deg Inclination = 4.38814207 deg Eccentricity = 0.15101578 Semimajor axis = 2.22116055 AU Perihelion dist = 1.88573025 AU Mag: H = 10.90, G = 0.15 Epoch of elements : MJD 54603.07300000 TDT (2008 May 17.073) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 17 770 Bali 16h 48.2m UT 11.9 16 57 34.728-25 32 59.622UCAC 21353937 0.0 14.5 16 1.5 1.577 -2.512 -1.38 126.5925 -25.550 -72.94 19.52 16.8031 0.00641 -0.15107 -6.09291 -0.24814 -0.00173 0.00045 2000 187.0905042008 514.00000 17.703121 44.804210 4.3881420.15101578 2.2211606 1.885730310.9 5.00.15 RATE 2.9773800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.036 94 3.57 0.036 0 54594.5020080517_353937 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org