IOTA/IOTA-ES occultation update for (20) Massalia / HIP 42209 event on 2007 Feb 07, 22:22 UT Visible from Africa Summary ------- On 2007 Feb 07 UT, the 146 km diameter asteroid (20) Massalia will occult a 8.1 mag star in the constellation Cancer for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 8.8 mag (the magnitude of the asteroid) for at most 18.7 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: . The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2007 Feb 07, 22:09 - 2007 Feb 07, 22:35 UT * magnitude of target star: 8.1 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 18.7 * Moon: 73 % sunlit, 75° distance * Sun: 168° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 152 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .022", 95° ) * approx speed of asteroid's shadow [km/s]: 7.8194 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 42209 by 20 Massalia on 2007 Feb 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 - 77 0 0 0 8 44 22 35 19 0 73 11 0 51 56 - 0 34 38 1 2 16 - 0 45 4 - 76 0 0 0 27 12 22 35 19 1 73 10 1 10 20 - 0 16 5 1 20 39 - 0 26 30 - 75 0 0 0 45 19 22 35 18 2 73 9 1 28 21 0 2 6 1 38 40 - 0 8 18 - 74 0 0 1 3 3 22 35 18 3 73 8 1 46 1 0 19 55 1 56 18 0 9 32 - 73 0 0 1 20 24 22 35 17 4 73 7 2 3 18 0 37 21 2 13 34 0 26 59 - 72 0 0 1 37 23 22 35 15 6 73 6 2 20 12 0 54 24 2 30 27 0 44 4 - 71 0 0 1 53 59 22 35 14 7 73 5 2 36 44 1 11 5 2 46 58 1 0 45 - 70 0 0 2 10 12 22 35 12 8 73 4 2 52 52 1 27 22 3 3 5 1 17 4 - 69 0 0 2 26 2 22 35 10 9 73 3 3 8 38 1 43 16 3 18 50 1 32 59 - 68 0 0 2 41 28 22 35 7 10 73 2 3 24 0 1 58 47 3 34 11 1 48 31 - 67 0 0 2 56 32 22 35 5 11 73 1 3 38 59 2 13 54 3 49 9 2 3 39 - 66 0 0 3 11 11 22 35 2 12 73 0 3 53 35 2 28 38 4 3 44 2 18 24 - 65 0 0 3 25 27 22 34 59 13 73 -1 4 7 47 2 42 58 4 17 55 2 32 45 - 64 0 0 3 39 20 22 34 55 14 73 -2 4 21 35 2 56 55 4 31 43 2 46 42 - 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Data for the target star ------------------------ * name: HIP 42209 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 36 21.8080 DE: +17 17 18.934 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .028, .017 ) * V mag [mag]: 8.1 * B mag [mag]: 9.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20) Massalia approx. diameter [km]: 146 approx. diameter ["]: .179 distance from Earth [AU]: 1.12600 * orbital information: orbit source: Preston date of fit: 2007 Jan 26 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1326 number of rejected observations: 250 time covered by the observations: 1900 Jul 17 - 2007 Jan 25 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.013, 104° remarks: * orbital elements for (20) Massalia : Mean anomaly = 22.88046043 deg Arg. of pericenter = 255.49489158 deg Long. of node = 206.50765958 deg Inclination = 0.70693151 deg Eccentricity = 0.14280091 Semimajor axis = 2.40892680 AU Perihelion dist = 2.06492987 AU Mag: H = 6.44, G = 0.25 Epoch of elements : MJD 54138.93200000 TDT (2007 Feb 07.932) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Feb 07 20 Massalia 22h 22.2m UT 8.1 8 36 21.808 17 17 18.93HIP 42209 9.2 8.8 146 18.7 1.126 -2.316 9.37 15.877 17.285 207.98 -15.20 22.3706 -.07390 -.26068 -4.24732 1.19958 0.00109 -0.00016 2000 20.52585862007 130.00000255.494892206.507660 0.7069320.142800912.408926802.064929876.505 0.25 RATE 2.6361412 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.035 0.022 95.0 1.120 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jan 26, 08:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org