IOTA/IOTA-ES occultation update for (903) Nealley / UCAC2 34805004 event on 2008 Jan 07, 10:40 UT Visible from Mexico, USA, E Russia Summary ------- On 2008 Jan 07 UT, the 63 km diameter asteroid (903) Nealley will occult a 11.6 mag star in the constellation Monoceros for observers along a path across Mexico, USA, E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.5 mag (the magnitude of the asteroid) for at most 4.7 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: 38 * date and approx. time of event: 2008 Jan 07, 10:33 - 2008 Jan 07, 10:46 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.7 * Moon: 1 % sunlit, 160° distance * Sun: 163° distance * rough path description: Mexico, USA, E Russia The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 1.76 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .069) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .069", 90° ) * approx speed of asteroid's shadow [km/s]: 13.4292 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 34805004 by 903 Nealley on 2008 Jan 07 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 88 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 53 18 46 .. .. .. 89 0 0 51 47 8 10 46 12 0 77 -5 52 9 14 51 25 8 53 27 56 .. .. .. 90 0 0 51 56 11 10 46 12 1 77 -6 52 18 16 51 34 14 53 36 52 .. .. .. 91 0 0 52 5 1 10 46 12 2 78 -7 52 27 3 51 43 5 53 45 34 .. .. .. 92 0 0 52 13 36 10 46 12 2 79 -7 52 35 37 51 51 42 53 54 2 .. .. .. 93 0 0 52 21 57 10 46 12 3 80 -8 52 43 57 52 0 4 54 2 16 .. .. .. 94 0 0 52 30 4 10 46 11 4 80 -8 52 52 2 52 8 13 54 10 16 .. .. .. 95 0 0 52 37 57 10 46 11 4 81 -9 52 59 54 52 16 7 54 18 3 .. .. .. 96 0 0 52 45 36 10 46 10 5 82 -10 53 7 31 52 23 48 54 25 35 .. .. .. 97 0 0 52 53 1 10 46 10 5 83 -10 53 14 55 52 31 14 54 32 53 .. .. .. 98 0 0 53 0 12 10 46 9 6 84 -11 53 22 4 52 38 26 54 39 57 .. .. .. 99 0 0 53 7 9 10 46 8 7 84 -11 53 29 0 52 45 25 54 46 48 .. .. .. 100 0 0 53 13 52 10 46 8 7 85 -12 53 35 42 52 52 9 54 53 25 .. .. 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.. .. - 77 0 0 22 59 48 10 33 40 3 278 -17 23 21 41 22 38 2 24 39 34 .. .. .. - 76 0 0 22 49 44 10 33 40 2 279 -16 23 11 36 22 28 0 24 29 24 .. .. .. - 75 0 0 22 39 59 10 33 40 1 279 -15 23 1 49 22 18 16 24 19 34 .. .. .. - 74 0 0 22 30 33 10 33 40 0 279 -15 22 52 22 .. .. .. 24 10 3 .. .. .. Data for the target star ------------------------ * name: UCAC2 34805004 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 29 00.3343 DE: +08 39 59.259 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .066, .066 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (903) Nealley approx. diameter [km]: 63 approx. diameter ["]: .039 distance from Earth [AU]: 2.22500 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 882 number of rejected observations: 43 time covered by the observations: 1918 Sep 13 - 2007 Dec 14 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.019, 88° remarks: * orbital elements for (903) Nealley : Mean anomaly = 57.67264539 deg Arg. of pericenter = 238.52911441 deg Long. of node = 159.68115431 deg Inclination = 11.74892706 deg Eccentricity = 0.03838067 Semimajor axis = 3.24162146 AU Perihelion dist = 3.11720584 AU Mag: H = 10.03, G = 0.15 Epoch of elements : MJD 54472.44400000 TDT (2008 Jan 07.444) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 07 903 Nealley 10h 39.9m UT 11.6 6 29 0.334 8 39 59.26UCAC2 34805004 0.0 14.5 63 4.7 2.225 -1.952 7.67 -169.115 8.665 21.53 -22.42 10.6657 .15534 .58752 -7.32743 1.93969 0.00102 0.00146 2000 57.25991902008 1 5.00000238.529114159.681154 11.7489270.038380673.241621463.11720584 9.85 0.15 RATE 1.6887316 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.072 0.069 89.7 2.760 0.069 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org