IOTA/IOTA-ES occultation update for (1534) Nasi / 2UCAC 18982362 event on 2008 Jul 09, 05:35 UT Visible from Brazil, Peru Summary ------- On 2008 Jul 09 UT, the 22 km diameter asteroid (1534) Nasi will occult a 10.2 mag star in the constellation Scorpius for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.8 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: 20 * date and approx. time of event: 2008 Jul 09, 05:28 - 2008 Jul 09, 05:42 UT * midpoint of event [JD]: 2454656.73326667 * magnitude of target star: 10.2 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 1.6 * Moon: 40 % sunlit, 83° distance * Sun: 160° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 3.31 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .039", 95° ) * approx speed of asteroid's shadow [km/s]: 13.9850 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 18982362 by 1534 Nasi on 2008 Jul 9 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 -171 0 0 8 7 10 5 42 39 15 125 0 8 14 32 7 59 48 9 3 31 7 11 15 -170 0 0 7 35 5 5 42 36 17 125 -1 7 42 26 7 27 45 8 31 15 6 39 21 -169 0 0 7 3 25 5 42 33 18 125 -2 7 10 45 6 56 6 7 59 24 6 7 52 -168 0 0 6 32 11 5 42 30 19 126 -3 6 39 29 6 24 53 7 27 59 5 36 48 -167 0 0 6 1 23 5 42 27 20 126 -4 6 8 39 5 54 7 6 56 59 5 6 11 -166 0 0 5 31 1 5 42 24 21 126 -6 5 38 16 5 23 47 6 26 27 4 36 0 -165 0 0 5 1 7 5 42 21 22 126 -7 5 8 20 4 53 54 5 56 21 4 6 17 -164 0 0 4 31 41 5 42 17 23 126 -8 4 38 53 4 24 29 5 26 44 3 37 2 -163 0 0 4 2 43 5 42 13 24 126 -9 4 9 53 3 55 32 4 57 35 3 8 14 -162 0 0 3 34 13 5 42 9 25 127 -10 3 41 23 3 27 5 4 28 55 2 39 56 -161 0 0 3 6 13 5 42 5 26 127 -11 3 13 21 2 59 6 4 0 44 2 12 7 -160 0 0 2 38 43 5 42 1 27 127 -12 2 45 50 2 31 37 3 33 3 1 44 47 -159 0 0 2 11 43 5 41 57 28 127 -13 2 18 48 2 4 38 3 5 52 1 17 57 -158 0 0 1 45 13 5 41 52 29 127 -14 1 52 17 1 38 10 2 39 11 0 51 38 -157 0 0 1 19 14 5 41 48 30 127 -15 1 26 16 1 12 12 2 13 1 0 25 49 -156 0 0 0 53 45 5 41 43 32 127 -16 1 0 46 0 46 45 1 47 22 0 0 31 -155 0 0 0 28 48 5 41 38 33 128 -17 0 35 48 0 21 49 1 22 15 - 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30 0 0 18 44 38 5 28 54 6 235 -26 18 52 21 18 36 56 19 43 37 17 46 9 - 29 0 0 19 21 26 5 28 53 5 235 -24 19 29 9 19 13 42 20 20 31 18 22 50 - 28 0 0 19 58 17 5 28 53 4 235 -23 20 6 1 19 50 33 20 57 28 .. .. .. - 27 0 0 20 35 12 5 28 52 3 236 -22 20 42 57 20 27 27 21 34 28 .. .. .. - 26 0 0 21 12 8 5 28 52 1 236 -21 21 19 53 21 4 23 22 11 29 .. .. .. - 25 0 0 21 49 5 5 28 52 0 236 -20 21 56 51 21 41 19 .. .. .. .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Jun 6.0] Data for the target star ------------------------ * name: 2UCAC 18982362 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 51.3212 DE: -30 42 59.490 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .031 ) * V mag [mag]: 10.2 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 268.8610188997 DE(deg): -30.7196859429 * Equation of equinoxes (radians) : 0.000051285929359 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1534) Nasi approx. diameter [km]: 22 approx. diameter ["]: .012 distance from Earth [AU]: 2.43100 * orbital information: orbit source: Preston date of fit: 2008 Jun 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 622 number of rejected observations: 32 time covered by the observations: 1924 Dec 22 - 2007 Aug 15 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.024, 98° remarks: * orbital elements for (1534) Nasi : Mean anomaly = 164.69518111 deg Arg. of pericenter = 41.51609532 deg Long. of node = 62.65281222 deg Inclination = 9.82133829 deg Eccentricity = 0.25202451 Semimajor axis = 2.73286741 AU Perihelion dist = 2.04411785 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 54656.23300000 TDT (2008 Jul 09.233) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 9 1534 Nasi 5h 35.9m UT 10.2 17 54 51.321-30 42 59.492UCAC 18982362 0.0 16.8 22 1.6 2.431 -2.209 -1.76 -102.7970 -30.716 97.34 22.31 5.5984 -0.02376 0.37588 -7.87836 -0.48859 0.00183 0.00067 2000 163.3353862008 7 3.00000 41.516095 62.652812 9.8213380.25202451 2.7328674 2.044117811.7 5.00.15 RATE 2.1816060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.056 0.039 95 4.31 0.040 0 54623.5020080709_982362 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 06, 21:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org