IOTA/IOTA-ES occultation update for (428) Monachia / TYC 6167-00596-1 event on 2008 May 20, 06:24 UT Visible from Venezuela, Colombia Summary ------- On 2008 May 20 UT, the 18 km diameter asteroid (428) Monachia will occult a 10.2 mag star in the constellation Libra for observers along a path across Venezuela, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.4 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: 33 * date and approx. time of event: 2008 May 20, 06:17 - 2008 May 20, 06:32 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 1.4 * Moon: 100 % sunlit, 14° distance * Sun: 166° distance * rough path description: Venezuela, Colombia The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 2.03 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .030", 107° ) * approx speed of asteroid's shadow [km/s]: 12.5067 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6167-00596-1 by 428 Monachia on 2008 May 20 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 -176 0 0 31 33 48 6 32 24 10 124 0 31 40 5 31 27 32 32 5 40 31 2 7 -175 0 0 31 5 56 6 32 23 11 124 -1 31 12 13 30 59 40 31 37 48 30 34 15 -174 0 0 30 37 56 6 32 21 12 125 -2 30 44 13 30 31 40 31 9 48 30 6 15 -173 0 0 30 9 49 6 32 19 13 125 -3 30 16 6 30 3 33 30 41 41 29 38 8 -172 0 0 29 41 36 6 32 17 14 126 -4 29 47 53 29 35 19 30 13 27 29 9 55 -171 0 0 29 13 17 6 32 14 15 126 -5 29 19 33 29 7 0 29 45 7 28 41 37 -170 0 0 28 44 53 6 32 12 15 127 -6 28 51 9 28 38 37 29 16 42 28 13 14 -169 0 0 28 16 25 6 32 9 16 127 -7 28 22 41 28 10 9 28 48 14 27 44 47 -168 0 0 27 47 54 6 32 6 17 128 -8 27 54 10 27 41 38 28 19 41 27 16 17 -167 0 0 27 19 20 6 32 3 18 128 -9 27 25 36 27 13 5 27 51 6 26 47 45 -166 0 0 26 50 45 6 32 0 19 129 -10 26 57 1 26 44 30 27 22 30 26 19 11 -165 0 0 26 22 9 6 31 56 20 129 -11 26 28 24 26 15 54 26 53 52 25 50 36 -164 0 0 25 53 33 6 31 53 21 130 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-60 2 15 36 2 4 36 2 37 59 1 42 20 - 75 0 0 2 12 45 6 20 47 48 233 -60 2 18 15 2 7 15 2 40 38 1 44 58 - 74 0 0 2 15 52 6 20 39 47 234 -59 2 21 22 2 10 22 2 43 46 1 48 4 - 73 0 0 2 19 27 6 20 32 46 234 -58 2 24 58 2 13 57 2 47 23 1 51 39 - 72 0 0 2 23 31 6 20 25 45 235 -57 2 29 2 2 18 1 2 51 28 1 55 42 - 71 0 0 2 28 4 6 20 19 44 235 -57 2 33 35 2 22 33 2 56 1 2 0 13 - 70 0 0 2 33 5 6 20 12 43 236 -56 2 38 36 2 27 34 3 1 4 2 5 13 - 69 0 0 2 38 34 6 20 5 43 236 -55 2 44 6 2 33 3 3 6 34 2 10 41 - 68 0 0 2 44 32 6 19 59 42 237 -54 2 50 4 2 39 1 3 12 34 2 16 37 - 67 0 0 2 50 58 6 19 52 41 237 -54 2 56 31 2 45 27 3 19 2 2 23 2 - 66 0 0 2 57 53 6 19 46 40 238 -53 3 3 26 2 52 21 3 25 58 2 29 56 - 65 0 0 3 5 17 6 19 40 39 238 -52 3 10 50 2 59 44 3 33 24 2 37 17 - 64 0 0 3 13 9 6 19 33 38 238 -51 3 18 42 3 7 36 3 41 17 2 45 7 - 63 0 0 3 21 29 6 19 27 37 239 -50 3 27 2 3 15 56 3 49 40 2 53 25 - 62 0 0 3 30 18 6 19 22 36 239 -49 3 35 52 3 24 44 3 58 31 3 2 12 - 61 0 0 3 39 35 6 19 16 35 239 -49 3 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-19 11 56 58 11 45 7 12 21 5 11 21 8 - 30 0 0 12 14 2 6 17 28 5 246 -18 12 19 58 12 8 6 12 44 9 11 44 4 - 29 0 0 12 37 24 6 17 27 4 246 -17 12 43 22 12 31 27 13 7 36 12 7 22 - 28 0 0 13 1 9 6 17 27 3 247 -16 13 7 7 12 55 11 13 31 25 .. .. .. - 27 0 0 13 25 14 6 17 26 2 247 -15 13 31 13 13 19 16 13 55 35 .. .. .. - 26 0 0 13 49 41 6 17 26 0 247 -14 13 55 41 13 43 42 14 20 6 .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6167-00596-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 51 05.5020 DE: -22 09 31.432 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.2 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (428) Monachia approx. diameter [km]: 18 approx. diameter ["]: .015 distance from Earth [AU]: 1.69600 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 890 number of rejected observations: 42 time covered by the observations: 1904 Nov 16 - 2008 Apr 18 1 sigma uncertainty ellipse (major, minor, PA): 0.037, 0.022, 113° remarks: * orbital elements for (428) Monachia : Mean anomaly = 206.10044787 deg Arg. of pericenter = 15.42975092 deg Long. of node = 17.74999146 deg Inclination = 6.19892517 deg Eccentricity = 0.17916666 Semimajor axis = 2.30744044 AU Perihelion dist = 1.89402405 AU Mag: H = 11.91, G = 0.15 Epoch of elements : MJD 54606.26700000 TDT (2008 May 20.267) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 20 428 Monachia 6h 25.0m UT 10.2 14 51 5.502-22 9 31.43TYC 6167-00596-1 11.2 15.2 18 1.4 1.696 -2.575 7.70 -111.7627 -22.160 82.89 20.07 6.4166 0.09594 0.44705 -6.90101 1.48572 0.00130 0.00014 2000 204.3381962008 514.00000 15.429751 17.749991 6.1989250.17916666 2.3074404 1.894024011.5 5.00.15 RATE 2.8119550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.030 107 3.03 0.030 0 54594.5020080520_0596-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org