IOTA/IOTA-ES occultation update for (2450) Ioannisiani / HIP 31651 event on 2008 Jan 07, 23:39 UT Visible from S Africa, Brazil Summary ------- On 2008 Jan 07 UT, the 35 km diameter asteroid (2450) Ioannisiani will occult a 7.7 mag star in the constellation Gemini for observers along a path across S Africa, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.1 mag to 15.8 mag (the magnitude of the asteroid) for at most 2.5 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: 29 * date and approx. time of event: 2008 Jan 07, 23:33 - 2008 Jan 07, 23:45 UT * magnitude of target star: 7.7 * magnitude drop [mag]: 8.1 * estimated maximum duration [s]: 2.5 * Moon: 0 % sunlit, 174° distance * Sun: 172° distance * rough path description: S Africa, Brazil The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 2.30 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .075 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .075", .050", 92° ) * approx speed of asteroid's shadow [km/s]: 13.7616 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 31651 by 2450 Ioannisiani 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 - 81 0 0 -28 42 38 23 45 36 0 65 7 -28 29 14 .. .. .. .. .. .. .. .. .. - 80 0 0 -28 17 34 23 45 36 1 64 6 -28 4 12 -28 30 59 .. .. .. -29 33 18 - 79 0 0 -27 52 45 23 45 36 2 64 5 -27 39 24 -28 6 8 .. .. .. -29 8 17 - 78 0 0 -27 28 11 23 45 35 3 63 4 -27 14 52 -27 41 32 .. .. .. -28 43 32 - 77 0 0 -27 3 53 23 45 35 4 63 3 -26 50 36 -27 17 12 .. .. .. -28 19 2 - 76 0 0 -26 39 51 23 45 34 5 62 2 -26 26 37 -26 53 8 .. .. .. -27 54 48 - 75 0 0 -26 16 7 23 45 33 6 62 1 -26 2 55 -26 29 22 .. .. .. -27 30 52 - 74 0 0 -25 52 41 23 45 32 7 61 0 -25 39 31 -26 5 53 -24 39 29 -27 7 14 - 73 0 0 -25 29 33 23 45 31 8 61 0 -25 16 25 -25 42 43 -24 16 32 -26 43 54 - 72 0 0 -25 6 44 23 45 29 9 61 -1 -24 53 38 -25 19 52 -23 53 55 -26 20 53 - 71 0 0 -24 44 14 23 45 28 10 60 -2 -24 31 10 -24 57 20 -23 31 37 -25 58 11 - 70 0 0 -24 22 5 23 45 26 11 60 -3 -24 9 3 -24 35 9 -23 9 38 -25 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.. .. .. -39 39 13 64 0 0 -38 47 9 23 33 27 4 303 -10 -38 33 15 -39 1 6 .. .. .. -40 5 57 65 0 0 -39 13 45 23 33 26 3 302 -9 -38 59 50 -39 27 43 .. .. .. -40 32 37 66 0 0 -39 40 16 23 33 26 2 302 -8 -39 26 21 -39 54 14 .. .. .. -40 59 11 67 0 0 -40 6 42 23 33 26 2 301 -7 -39 52 46 -40 20 40 .. .. .. -41 25 39 68 0 0 -40 33 1 23 33 25 1 300 -6 -40 19 5 -40 47 0 .. .. .. .. .. .. Data for the target star ------------------------ * name: HIP 31651 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 37 29.3044 DE: +22 08 55.528 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .020, .015 ) * V mag [mag]: 7.7 * B mag [mag]: 7.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2450) Ioannisiani approx. diameter [km]: 35 approx. diameter ["]: .022 distance from Earth [AU]: 2.21900 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 880 number of rejected observations: 17 time covered by the observations: 1959 Feb 01 - 2007 Dec 10 1 sigma uncertainty ellipse (major, minor, PA): 0.072, 0.048, 92° remarks: * orbital elements for (2450) Ioannisiani : Mean anomaly = 262.92285567 deg Arg. of pericenter = 93.11919150 deg Long. of node = 117.36182957 deg Inclination = 2.51972269 deg Eccentricity = 0.10997432 Semimajor axis = 3.11727590 AU Perihelion dist = 2.77445560 AU Mag: H = 11.49, G = 0.15 Epoch of elements : MJD 54472.98600000 TDT (2008 Jan 07.986) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 07 2450 Ioannisiani 23h 39.5m UT 7.7 6 37 29.304 22 8 55.53HIP 31651 7.8 15.8 35 2.5 2.219 -2.199 3.65 -2.421 22.147 186.69 -22.35 23.6585 -.07304 -.60932 -7.71247 0.92218 0.00088 0.00005 2000 262.3881302008 1 5.00000 93.119191117.361830 2.5197230.109974323.117275902.7744556011.35 0.15 RATE 1.7907760 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.075 0.050 91.9 3.300 0.050 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org