IOTA/IOTA-ES occultation update for (51) Nemausa / HIP 48681 event on 2007 Jan 03, 13:18 UT Visible from W USA, Japan, China Summary ------- On 2007 Jan 03 UT, the 148 km diameter asteroid (51) Nemausa will occult a 9.7 mag star in the constellation Sextans for observers along a path across W USA, Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 11.0 mag (the magnitude of the asteroid) for at most 126.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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: 100 * date and approx. time of event: 2007 Jan 03, 12:02 - 2007 Jan 03, 14:32 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 126.5 * Moon: 100 % sunlit, 51° distance * Sun: 131° distance * rough path description: W USA, Japan, China The occultation path -------------------- * approximate projected width [km]: 179 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 18.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .021 +/- .018) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .018", 95° ) * approx speed of asteroid's shadow [km/s]: 1.1703 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 48681 by 51 Nemausa on 2007 Jan 03 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 98 0 0 28 23 53 14 32 7 0 89 -49 29 12 20 27 35 54 29 25 0 .. .. .. 99 0 0 28 25 12 14 32 5 1 89 -50 29 13 38 27 37 14 29 26 18 .. .. .. 100 0 0 28 26 37 14 32 2 2 90 -51 29 15 2 27 38 40 29 27 41 .. .. .. 101 0 0 28 28 8 14 31 58 3 90 -52 29 16 32 27 40 12 29 29 11 27 27 48 102 0 0 28 29 45 14 31 52 4 91 -53 29 18 8 27 41 49 29 30 47 27 29 26 103 0 0 28 31 27 14 31 45 5 91 -54 29 19 49 27 43 32 29 32 28 27 31 9 104 0 0 28 33 15 14 31 36 6 92 -54 29 21 36 27 45 21 29 34 15 27 32 58 105 0 0 28 35 8 14 31 26 6 92 -55 29 23 29 27 47 15 29 36 8 27 34 52 106 0 0 28 37 7 14 31 15 7 93 -56 29 25 27 27 49 14 29 38 6 27 36 51 107 0 0 28 39 11 14 31 2 8 93 -57 29 27 30 27 51 18 29 40 9 27 38 56 108 0 0 28 41 20 14 30 48 9 94 -58 29 29 38 27 53 28 29 42 17 27 41 5 109 0 0 28 43 33 14 30 33 10 94 -59 29 31 52 27 55 42 29 44 30 27 43 20 110 0 0 28 45 52 14 30 17 11 94 -59 29 34 10 27 58 1 29 46 48 27 45 39 111 0 0 28 48 15 14 29 59 11 95 -60 29 36 33 28 0 25 29 49 11 27 48 3 112 0 0 28 50 43 14 29 41 12 95 -61 29 39 0 28 2 53 29 51 38 27 50 31 113 0 0 28 53 16 14 29 21 13 96 -62 29 41 32 28 5 26 29 54 10 27 53 4 114 0 0 28 55 52 14 29 0 14 96 -63 29 44 9 28 8 3 29 56 46 27 55 41 115 0 0 28 58 34 14 28 38 15 97 -63 29 46 49 28 10 44 29 59 27 27 58 23 116 0 0 29 1 19 14 28 15 15 97 -64 29 49 35 28 13 30 30 2 12 28 1 8 117 0 0 29 4 8 14 27 51 16 98 -65 29 52 24 28 16 20 30 5 1 28 3 58 118 0 0 29 7 2 14 27 25 17 98 -66 29 55 17 28 19 13 30 7 54 28 6 52 119 0 0 29 9 59 14 26 59 18 99 -66 29 58 14 28 22 11 30 10 51 28 9 49 120 0 0 29 13 0 14 26 32 18 99 -67 30 1 15 28 25 12 30 13 52 28 12 51 121 0 0 29 16 5 14 26 4 19 100 -68 30 4 20 28 28 17 30 16 57 28 15 56 122 0 0 29 19 14 14 25 35 20 100 -69 30 7 29 28 31 26 30 20 6 28 19 5 123 0 0 29 22 26 14 25 5 21 101 -69 30 10 41 28 34 38 30 23 18 28 22 17 124 0 0 29 25 42 14 24 34 21 101 -70 30 13 57 28 37 54 30 26 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1 41 48 34 40 11 21 42 1 21 39 58 51 - 67 0 0 41 1 0 12 7 26 17 257 2 41 49 50 40 12 39 42 2 36 40 0 8 - 66 0 0 41 2 11 12 7 4 16 257 2 41 51 0 40 13 51 42 3 46 40 1 21 - 65 0 0 41 3 17 12 6 42 15 258 3 41 52 5 40 14 58 42 4 50 40 2 28 - 64 0 0 41 4 18 12 6 21 15 258 3 41 53 4 40 15 59 42 5 49 40 3 30 - 63 0 0 41 5 13 12 6 1 14 259 4 41 53 58 40 16 55 42 6 43 40 4 26 - 62 0 0 41 6 2 12 5 42 13 260 4 41 54 46 40 17 46 42 7 31 40 5 17 - 61 0 0 41 6 46 12 5 23 13 260 5 41 55 29 40 18 31 42 8 13 40 6 2 - 60 0 0 41 7 24 12 5 6 12 261 5 41 56 6 40 19 10 42 8 50 40 6 42 - 59 0 0 41 7 56 12 4 49 11 262 6 41 56 37 40 19 43 42 9 21 40 7 16 - 58 0 0 41 8 23 12 4 34 11 262 7 41 57 2 40 20 11 42 9 46 40 7 43 - 57 0 0 41 8 43 12 4 19 10 263 7 41 57 21 40 20 33 42 10 4 40 8 5 - 56 0 0 41 8 58 12 4 5 9 263 8 41 57 34 40 20 48 42 10 17 40 8 21 - 55 0 0 41 9 6 12 3 52 9 264 8 41 57 42 40 20 58 42 10 24 40 8 31 - 54 0 0 41 9 8 12 3 40 8 265 9 41 57 42 40 21 1 42 10 25 40 8 35 - 53 0 0 41 9 4 12 3 29 7 265 9 41 57 37 40 20 58 42 10 19 40 8 32 - 52 0 0 41 8 53 12 3 20 6 266 10 41 57 25 40 20 48 42 10 7 40 8 23 - 51 0 0 41 8 36 12 3 11 6 267 10 41 57 7 40 20 33 42 9 49 40 8 7 - 50 0 0 41 8 13 12 3 3 5 267 11 41 56 42 40 20 10 42 9 23 40 7 45 - 49 0 0 41 7 42 12 2 56 4 268 11 41 56 11 40 19 41 42 8 52 40 7 16 - 48 0 0 41 7 6 12 2 50 3 269 12 41 55 33 40 19 5 42 8 13 40 6 41 - 47 0 0 41 6 22 12 2 46 3 269 13 41 54 48 40 18 23 42 7 28 40 5 58 - 46 0 0 41 5 31 12 2 42 2 270 13 41 53 56 40 17 33 42 6 36 .. .. .. - 45 0 0 41 4 34 12 2 40 1 270 14 41 52 57 40 16 37 42 5 37 .. .. .. - 44 0 0 41 3 29 12 2 38 0 271 14 41 51 52 40 15 33 42 4 31 .. .. .. Data for the target star ------------------------ * name: HIP 48681 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 55 42.9430 DE: +01 11 15.042 * position source: mpos:UCAC2 pm:UCAC2 plx:HIP * standard error: RA,DE ["]: ( .014, .014 ) * V mag [mag]: 9.7 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (51) Nemausa approx. diameter [km]: 148 approx. diameter ["]: .138 distance from Earth [AU]: 1.48300 * orbital information: orbit source: Preston date of fit: 2006 Dec 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 3457 number of rejected observations: 374 time covered by the observations: 1906 Jun 27 - 2006 Dec 21 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.011, 99° remarks: * orbital elements for (51) Nemausa : Mean anomaly = 317.62911694 deg Arg. of pericenter = 2.82119358 deg Long. of node = 176.16800587 deg Inclination = 9.97163123 deg Eccentricity = 0.06643625 Semimajor axis = 2.36547318 AU Perihelion dist = 2.20832003 AU Mag: H = 7.35, G = 0.08 Epoch of elements : MJD 54103.55400000 TDT (2007 Jan 03.554) ------ occelmnt file for Occult BEGIN ------------------------------------ 2007 Jan 03 51 Nemausa 13h 17.7m UT 9.7 9 55 42.943 1 11 15.04HIP 48681 10.2 11.0 148 126.5 1.483 -0.261 -0.42 -153.277 1.189 -18.32 -22.82 13.2947 -.06020 .55937 -0.65654 -0.07248 -0.00371 0.00212 2000 316.66629820061231.00000 2.821194176.168006 9.9716310.066436252.365473182.208320037.355 0.08 RATE 2.7091120 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.021 0.018 94.7 1.130 0.018 ------ occelmnt file for Occult END ------------------------------------ ============================================ Calculator (s): Steve Preston Date of update: 2006 Dec 30, 01:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org