IOTA/IOTA-ES occultation update for (6212) 1993 MS1 / HIP 73636 event on 2008 May 07, 19:56 UT Visible from SE Australia, Africa, Europe Summary ------- On 2008 May 07 UT, the 11 km diameter asteroid (6212) 1993 MS1 will occult a 6.9 mag star in the constellation Libra for observers along a path across SE Australia, Africa, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.5 mag to 14.4 mag (the magnitude of the asteroid) for at most 1.2 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: . The event at a glimpse ---------------------- * Rank: 10 * date and approx. time of event: 2008 May 07, 19:44 - 2008 May 07, 20:07 UT * midpoint of event [JD]: 2454594.33055833 * magnitude of target star: 6.9 * magnitude drop [mag]: 7.5 * estimated maximum duration [s]: 1.2 * Moon: 9 % sunlit, 147° distance * Sun: 179° distance * rough path description: SE Australia, Africa, Europe The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 6.94 * 1 sigma uncertainty interval [seconds]: +/- 9.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .124 +/- .064) * 1 sigma uncertainty ellipse (major, minor, PA): ( .124", .063", 95° ) * approx speed of asteroid's shadow [km/s]: 9.3318 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 73636 by 6212 1993 MS1 on 2008 May 7 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 ' " Longitude Longitude Longitude Longitude - 11 18 17 48 0 0 20 7 16 0 117 -1 - 11 8 24 ... .. .. - 8 54 49 ... .. .. - 8 30 19 47 0 0 20 7 16 2 119 -3 - 8 21 10 - 8 39 29 - 6 16 49 - 10 49 48 Latitude Latitude Latitude Latitude - 8 0 0 46 48 35 20 7 15 3 119 -3 46 52 1 46 45 9 47 39 45 45 57 32 - 7 0 0 46 25 25 20 7 15 3 120 -4 46 28 52 46 21 58 47 16 54 45 34 4 - 6 0 0 46 1 31 20 7 14 4 121 -5 46 4 59 45 58 2 46 53 19 45 9 51 - 5 0 0 45 36 51 20 7 14 5 121 -6 45 40 21 45 33 22 46 28 59 44 44 53 - 4 0 0 45 11 26 20 7 13 6 122 -7 45 14 57 45 7 55 46 3 53 44 19 8 - 3 0 0 44 45 14 20 7 12 7 123 -8 44 48 47 44 41 42 45 38 1 43 52 37 - 2 0 0 44 18 15 20 7 10 7 124 -8 44 21 49 44 14 41 45 11 22 43 25 18 - 1 0 0 43 50 28 20 7 9 8 124 -9 43 54 3 43 46 53 44 43 55 42 57 10 0 0 0 43 21 52 20 7 7 9 125 -10 43 25 29 43 18 15 44 15 39 42 28 14 1 0 0 42 52 26 20 7 6 10 126 -11 42 56 4 42 48 49 43 46 34 41 58 28 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12 16 -37 43 32 153 0 0 -36 47 42 19 44 57 11 256 -10 -36 44 38 -36 50 47 -36 1 53 -37 33 25 154 0 0 -36 36 49 19 44 55 10 255 -9 -36 33 44 -36 39 54 -35 50 52 -37 22 40 155 0 0 -36 25 16 19 44 53 9 255 -8 -36 22 10 -36 28 22 -35 39 11 -37 11 15 156 0 0 -36 13 4 19 44 51 8 254 -8 -36 9 57 -36 16 10 -35 26 50 -36 59 11 157 0 0 -36 0 11 19 44 50 8 254 -7 -35 57 4 -36 3 18 -35 13 48 -36 46 28 158 0 0 -35 46 37 19 44 49 7 253 -6 -35 43 30 -35 49 45 -35 0 4 -36 33 4 159 0 0 -35 32 23 19 44 48 6 253 -5 -35 29 15 -35 35 31 -34 45 39 -36 19 0 160 0 0 -35 17 26 19 44 47 5 252 -4 -35 14 17 -35 20 35 -34 30 32 -36 4 14 161 0 0 -35 1 48 19 44 46 4 251 -3 -34 58 38 -35 4 57 -34 14 42 -35 48 47 162 0 0 -34 45 26 19 44 45 3 251 -2 -34 42 15 -34 48 36 -33 58 8 -35 32 37 163 0 0 -34 28 20 19 44 45 3 250 -2 -34 25 9 -34 31 32 -33 40 51 -35 15 43 164 0 0 -34 10 31 19 44 44 2 250 -1 -34 7 19 -34 13 43 -33 22 48 -34 58 6 Uncertainty in time = +/- 11 secs [Prediction of 2008 Mar 31.0] Data for the target star ------------------------ * name: HIP 73636 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 03 06.4646 DE: -17 37 58.955 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 6.9 * B mag [mag]: 7.9 * Apparent position with proper motion RA(deg): 225.9022226781 DE(deg): -17.6691023403 * Equation of equinoxes (radians) : 0.000039171318209 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6212) 1993 MS1 approx. diameter [km]: 11 approx. diameter ["]: .013 distance from Earth [AU]: 1.13800 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 668 number of rejected observations: 4 time covered by the observations: 1974 Sep 22 - 2008 Jan 16 1 sigma uncertainty ellipse (major, minor, PA): 0.123, 0.060, 95° remarks: * orbital elements for (6212) 1993 MS1 : Mean anomaly = 6.65991154 deg Arg. of pericenter = 350.25488881 deg Long. of node = 228.89297717 deg Inclination = 11.34043378 deg Eccentricity = 0.13353076 Semimajor axis = 2.47498021 AU Perihelion dist = 2.14449422 AU Mag: H = 12.54, G = 0.15 Epoch of elements : MJD 54593.83100000 TDT (2008 May 07.831) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 7 6212 1993 MS1 19h 56.0m UT 6.9 15 3 6.465-17 37 58.96HIP 73636 7.9 14.4 11 1.2 1.138 -2.076 27.85 60.7491 -17.641 -119.87 17.09 19.9334 0.09362 0.09975 -3.84055 3.60453 -0.00005 0.00005 2000 5.6901652008 5 4.00000350.254889228.892977 11.3404340.13353076 2.4749802 2.144494212.4 5.00.15 RATE 2.5313160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.124 0.063 95 7.94 0.090 0 54556.5020080507__73636 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org