IOTA/IOTA-ES occultation update for (2356) Hirons / TYC 5244-00125-1 event on 2008 Feb 03, 10:56 UT Visible from Philippines Summary ------- On 2008 Feb 03 UT, the 46 km diameter asteroid (2356) Hirons will occult a 10.2 mag star in the constellation Pisces for observers along a path across Philippines. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 17.1 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: UCAC. The event at a glimpse ---------------------- * Rank: 33 * date and approx. time of event: 2008 Feb 03, 10:54 - 2008 Feb 03, 10:59 UT * midpoint of event [JD]: 2454499.95605 * magnitude of target star: 10.2 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 1.2 * Moon: 14 % sunlit, 82° distance * Sun: 39° distance * rough path description: Philippines The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 2.05 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .032", 84° ) * approx speed of asteroid's shadow [km/s]: 38.9187 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5244-00125-1 by 2356 Hirons on 2008 Feb 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 - 34 0 0 -23 17 7 10 54 0 1 92 39 -23 29 41 -23 4 34 -24 21 14 -22 13 8 - 33 0 0 -23 18 32 10 54 0 2 91 40 -23 31 6 -23 5 59 -24 22 39 -22 14 34 - 32 0 0 -23 19 41 10 54 0 2 91 41 -23 32 14 -23 7 8 -24 23 47 -22 15 43 - 31 0 0 -23 20 33 10 54 0 3 90 42 -23 33 6 -23 8 0 -24 24 39 -22 16 35 - 30 0 0 -23 21 8 10 54 1 4 90 43 -23 33 42 -23 8 35 -24 25 14 -22 17 11 - 29 0 0 -23 21 27 10 54 1 5 90 44 -23 34 1 -23 8 54 -24 25 33 -22 17 30 - 28 0 0 -23 21 30 10 54 1 6 89 45 -23 34 3 -23 8 57 -24 25 35 -22 17 32 - 27 0 0 -23 21 16 10 54 1 7 89 46 -23 33 49 -23 8 43 -24 25 21 -22 17 18 - 26 0 0 -23 20 45 10 54 2 8 88 46 -23 33 18 -23 8 12 -24 24 50 -22 16 47 - 25 0 0 -23 19 58 10 54 2 9 88 47 -23 32 31 -23 7 24 -24 24 3 -22 16 0 - 24 0 0 -23 18 54 10 54 3 10 88 48 -23 31 27 -23 6 21 -24 23 0 -22 14 56 - 23 0 0 -23 17 33 10 54 3 11 87 49 -23 30 7 -23 5 0 -24 21 40 -22 13 35 - 22 0 0 -23 15 56 10 54 4 12 87 50 -23 28 30 -23 3 23 -24 20 3 -22 11 57 - 21 0 0 -23 14 3 10 54 4 13 86 51 -23 26 36 -23 1 29 -24 18 10 -22 10 3 - 20 0 0 -23 11 52 10 54 5 14 86 52 -23 24 26 -22 59 19 -24 16 1 -22 7 52 - 19 0 0 -23 9 26 10 54 5 14 86 53 -23 22 0 -22 56 52 -24 13 35 -22 5 24 - 18 0 0 -23 6 42 10 54 6 15 85 54 -23 19 17 -22 54 8 -24 10 53 -22 2 40 - 17 0 0 -23 3 43 10 54 7 16 85 55 -23 16 17 -22 51 8 -24 7 54 -21 59 39 - 16 0 0 -23 0 26 10 54 7 17 84 56 -23 13 1 -22 47 52 -24 4 39 -21 56 22 - 15 0 0 -22 56 53 10 54 8 18 84 57 -23 9 28 -22 44 19 -24 1 7 -21 52 48 - 14 0 0 -22 53 4 10 54 9 19 84 58 -23 5 39 -22 40 29 -23 57 19 -21 48 57 - 13 0 0 -22 48 58 10 54 10 20 83 58 -23 1 34 -22 36 23 -23 53 15 -21 44 50 - 12 0 0 -22 44 36 10 54 11 21 83 59 -22 57 12 -22 32 1 -23 48 54 -21 40 26 - 11 0 0 -22 39 57 10 54 12 22 82 60 -22 52 33 -22 27 22 -23 44 17 -21 35 46 - 10 0 0 -22 35 2 10 54 13 23 82 61 -22 47 39 -22 22 26 -23 39 23 -21 30 49 - 9 0 0 -22 29 51 10 54 14 24 82 62 -22 42 28 -22 17 15 -23 34 14 -21 25 36 - 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Data for the target star ------------------------ * name: TYC 5244-00125-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 29 37.5444 DE: -01 42 18.303 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .018 ) * V mag [mag]: 10.2 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 352.5087636448 DE(deg): -1.6612814672 * Equation of equinoxes (radians) : 0.000045309741785 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2356) Hirons approx. diameter [km]: 46 approx. diameter ["]: .016 distance from Earth [AU]: 4.07400 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 608 number of rejected observations: 22 time covered by the observations: 1970 Apr 11 - 2007 Nov 11 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.027, 83° remarks: * orbital elements for (2356) Hirons : Mean anomaly = 167.41718132 deg Arg. of pericenter = 5.10070977 deg Long. of node = 189.17662682 deg Inclination = 15.59533925 deg Eccentricity = 0.03983591 Semimajor axis = 3.23320022 AU Perihelion dist = 3.10440274 AU Mag: H = 10.79, G = 0.15 Epoch of elements : MJD 54499.45600000 TDT (2008 Feb 03.456) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 03 2356 Hirons 10h 56.7m UT 10.2 23 29 37.544- 1 42 18.30TYC 5244-00125-1 11.5 17.1 46 1.2 4.074 3.035 13.35 55.223 -1.709 19.27 -16.63 10.9452 .03313 -.11346 21.07897 6.18199 0.00344 0.00161 2000 165.8140732008 125.00000 5.100710189.176627 15.5953390.039835913.233200223.1044027410.85 0.15 RATE 1.6953340 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.043 0.032 84.3 3.050 0.032 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 04, 01:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org