IOTA/IOTA-ES occultation update for (51) Nemausa / UCAC2 29919619 event on 2008 Jul 10, 07:39 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2008 Jul 10 UT, the 166 km diameter asteroid (51) Nemausa will occult a 11.7 mag star in the constellation Aquila for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 10.6 mag (the magnitude of the asteroid) for at most 16.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 96 * date and approx. time of event: 2008 Jul 10, 07:29 - 2008 Jul 10, 07:49 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 16.2 * Moon: 51 % sunlit, 100° distance * Sun: 162° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 171 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .065) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .065", 90° ) * approx speed of asteroid's shadow [km/s]: 10.2292 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 29919619 by 51 Nemausa on 2008 Jul 10 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 159 0 0 -29 29 32 7 49 13 1 96 -15 -28 42 55 -30 16 19 -28 4 49 -30 54 48 160 0 0 -29 35 20 7 49 13 1 96 -16 -28 48 45 -30 22 5 -28 10 39 -31 0 33 161 0 0 -29 40 53 7 49 12 2 95 -16 -28 54 18 -30 27 36 -28 16 14 -31 6 3 162 0 0 -29 46 10 7 49 12 3 95 -17 -28 59 37 -30 32 52 -28 21 33 -31 11 18 163 0 0 -29 51 12 7 49 11 4 94 -18 -29 4 40 -30 37 53 -28 26 38 -31 16 18 164 0 0 -29 55 59 7 49 11 5 94 -19 -29 9 28 -30 42 39 -28 31 26 -31 21 3 165 0 0 -30 0 30 7 49 10 6 93 -20 -29 14 1 -30 47 10 -28 36 0 -31 25 33 166 0 0 -30 4 47 7 49 9 7 93 -21 -29 18 18 -30 51 25 -28 40 18 -31 29 47 167 0 0 -30 8 48 7 49 7 8 92 -22 -29 22 20 -30 55 25 -28 44 21 -31 33 47 168 0 0 -30 12 34 7 49 6 8 92 -22 -29 26 7 -30 59 11 -28 48 9 -31 37 31 169 0 0 -30 16 5 7 49 5 9 91 -23 -29 29 39 -31 2 41 -28 51 41 -31 41 1 170 0 0 -30 19 21 7 49 3 10 91 -24 -29 32 55 -31 5 55 -28 54 58 -31 44 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43 - 30 0 0 - 1 56 8 7 29 33 17 265 -9 - 1 9 6 - 2 43 20 - 0 30 38 - 3 22 11 - 29 0 0 - 1 45 53 7 29 30 16 265 -8 - 0 58 52 - 2 33 4 - 0 20 26 - 3 11 53 - 28 0 0 - 1 35 52 7 29 27 15 264 -7 - 0 48 53 - 2 23 1 - 0 10 29 - 3 1 49 - 27 0 0 - 1 26 6 7 29 24 14 264 -6 - 0 39 9 - 2 13 13 - 0 0 45 - 2 51 59 - 26 0 0 - 1 16 34 7 29 22 13 264 -5 - 0 29 39 - 2 3 40 0 8 43 - 2 42 25 - 25 0 0 - 1 7 17 7 29 20 12 264 -4 - 0 20 23 - 1 54 21 0 17 57 - 2 33 4 - 24 0 0 - 0 58 15 7 29 17 11 264 -3 - 0 11 23 - 1 45 17 0 26 57 - 2 23 59 - 23 0 0 - 0 49 28 7 29 15 10 264 -2 - 0 2 37 - 1 36 29 0 35 41 - 2 15 10 - 22 0 0 - 0 40 56 7 29 14 9 264 -1 0 5 53 - 1 27 56 0 44 10 - 2 6 35 - 21 0 0 - 0 32 40 7 29 12 8 264 0 0 14 8 - 1 19 38 0 52 23 - 1 58 16 Uncertainty in time = +/- 7 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: UCAC2 29919619 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 49 36.9936 DE: -05 46 26.383 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .064, .064 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (51) Nemausa approx. diameter [km]: 166 approx. diameter ["]: .159 distance from Earth [AU]: 1.43500 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 3605 number of rejected observations: 381 time covered by the observations: 1906 Jun 27 - 2008 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.010, 84° remarks: * orbital elements for (51) Nemausa : Mean anomaly = 107.17573906 deg Arg. of pericenter = 3.29386647 deg Long. of node = 176.12158681 deg Inclination = 9.97157028 deg Eccentricity = 0.06687401 Semimajor axis = 2.36651350 AU Perihelion dist = 2.20825524 AU Mag: H = 7.38, G = 0.08 Epoch of elements : MJD 54657.31900000 TDT (2008 Jul 10.319) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 10 51 Nemausa 7h 39.2m UT 11.7 19 49 36.994- 5 46 26.38UCAC2 29919619 0.0 10.6 166 16.2 1.435 -2.291 -9.10 -105.9910 -5.772 66.57 22.17 7.6527 0.06464 -0.24235 -5.57985 -1.48340 -0.00063 -0.00152 2000 105.1942472008 7 3.00000 3.293866176.121587 9.9715700.06687401 2.3665135 2.2082553 7.4 5.00.08 RATE 2.7073260 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.065 90 1.41 0.065 0 54650.5020080710_919619 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org