IOTA/IOTA-ES occultation update for (631) Philippina / TYC 6028-01064-1 event on 2009 Feb 08, 07:02 UT Visible from Summary ------- On 2009 Feb 08 UT, the 58 km diameter asteroid (631) Philippina will occult a 10.7 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 12.5 mag (the magnitude of the asteroid) for at most 5.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 87 * date and approx. time of event: 2009 Feb 08, 06:53 - 2009 Feb 08, 07:11 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 5.5 * Moon: 97 % sunlit, 40° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 0.57 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .027", 101° ) * approx speed of asteroid's shadow [km/s]: 10.5339 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6028-01064-1 by 631 Philippina on 2009 Feb 8 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 179 0 0 42 51 31 7 11 45 1 112 -20 43 10 48 42 32 17 43 32 53 42 10 26 180 0 0 42 33 46 7 11 44 1 113 -21 42 53 5 42 14 30 43 15 12 41 52 37 -179 0 0 42 15 43 7 11 44 2 113 -21 42 35 4 41 56 25 42 57 13 41 34 29 -178 0 0 41 57 22 7 11 44 3 114 -22 42 16 46 41 38 2 42 38 57 41 16 4 -177 0 0 41 38 43 7 11 43 4 115 -23 41 58 9 41 19 21 42 20 23 40 57 21 -176 0 0 41 19 47 7 11 42 5 115 -23 41 39 15 41 0 24 42 1 31 40 38 21 -175 0 0 41 0 34 7 11 42 5 116 -24 41 20 4 40 41 9 41 42 22 40 19 4 -174 0 0 40 41 4 7 11 41 6 117 -25 41 0 36 40 21 37 41 22 56 39 59 30 -173 0 0 40 21 17 7 11 39 7 117 -26 40 40 51 40 1 48 41 3 13 39 39 39 -172 0 0 40 1 14 7 11 38 8 118 -27 40 20 49 39 41 43 40 43 13 39 19 32 -171 0 0 39 40 54 7 11 37 9 119 -27 40 0 31 39 21 22 40 22 57 38 59 9 -170 0 0 39 20 19 7 11 35 10 119 -28 39 39 57 39 0 44 40 2 25 38 38 30 -169 0 0 38 59 28 7 11 33 10 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15 36 246 -42 5 38 32 5 2 51 5 58 58 4 42 36 - 52 0 0 5 21 34 6 56 9 35 247 -41 5 39 26 5 3 45 5 59 53 4 43 29 - 51 0 0 5 22 54 6 56 2 35 247 -40 5 40 47 5 5 5 6 1 13 4 44 49 - 50 0 0 5 24 41 6 55 55 34 247 -40 5 42 34 5 6 51 6 3 1 4 46 34 - 49 0 0 5 26 53 6 55 49 33 248 -39 5 44 47 5 9 3 6 5 14 4 48 46 - 48 0 0 5 29 32 6 55 43 32 248 -38 5 47 26 5 11 41 6 7 54 4 51 24 - 47 0 0 5 32 37 6 55 37 31 248 -37 5 50 32 5 14 46 6 11 0 4 54 28 - 46 0 0 5 36 9 6 55 31 30 248 -36 5 54 4 5 18 17 6 14 33 4 57 58 - 45 0 0 5 40 7 6 55 25 29 249 -35 5 58 2 5 22 14 6 18 32 5 1 55 - 44 0 0 5 44 31 6 55 20 28 249 -34 6 2 27 5 26 37 6 22 58 5 6 17 - 43 0 0 5 49 21 6 55 14 27 249 -33 6 7 18 5 31 27 6 27 50 5 11 6 - 42 0 0 5 54 38 6 55 9 26 249 -32 6 12 36 5 36 43 6 33 9 5 16 21 - 41 0 0 6 0 21 6 55 4 25 250 -31 6 18 20 5 42 25 6 38 54 5 22 2 - 40 0 0 6 6 31 6 54 59 24 250 -30 6 24 31 5 48 34 6 45 6 5 28 10 - 39 0 0 6 13 6 6 54 54 23 250 -29 6 31 7 5 55 8 6 51 44 5 34 43 - 38 0 0 6 20 9 6 54 50 22 250 -28 6 38 11 6 2 10 6 58 48 5 41 43 - 37 0 0 6 27 37 6 54 45 21 250 -28 6 45 40 6 9 37 7 6 19 5 49 9 - 36 0 0 6 35 32 6 54 41 20 251 -27 6 53 37 6 17 31 7 14 17 5 57 2 - 35 0 0 6 43 53 6 54 37 20 251 -26 7 1 59 6 25 50 7 22 40 6 5 20 - 34 0 0 6 52 41 6 54 33 19 251 -25 7 10 48 6 34 37 7 31 31 6 14 5 - 33 0 0 7 1 54 6 54 30 18 251 -24 7 20 3 6 43 49 7 40 47 6 23 15 - 32 0 0 7 11 34 6 54 26 17 251 -23 7 29 44 6 53 27 7 50 30 6 32 52 - 31 0 0 7 21 40 6 54 23 16 252 -22 7 39 51 7 3 32 8 0 39 6 42 55 - 30 0 0 7 32 12 6 54 20 15 252 -21 7 50 25 7 14 2 8 11 14 6 53 23 - 29 0 0 7 43 10 6 54 17 14 252 -20 8 1 24 7 24 58 8 22 16 7 4 18 - 28 0 0 7 54 33 6 54 14 13 252 -19 8 12 50 7 36 20 8 33 43 7 15 38 - 27 0 0 8 6 23 6 54 12 12 252 -18 8 24 41 7 48 9 8 45 37 7 27 24 - 26 0 0 8 18 39 6 54 9 11 252 -18 8 36 58 8 0 22 8 57 56 7 39 36 - 25 0 0 8 31 20 6 54 7 10 253 -17 8 49 41 8 13 2 9 10 41 7 52 14 - 24 0 0 8 44 26 6 54 5 9 253 -16 9 2 50 8 26 6 9 23 51 8 5 16 - 23 0 0 8 57 58 6 54 3 8 253 -15 9 16 24 8 39 37 9 37 28 8 18 44 - 22 0 0 9 11 56 6 54 2 7 253 -14 9 30 23 8 53 32 9 51 29 8 32 38 - 21 0 0 9 26 18 6 54 1 6 253 -13 9 44 47 9 7 53 10 5 56 8 46 56 - 20 0 0 9 41 6 6 54 0 5 253 -12 9 59 37 9 22 38 10 20 48 9 1 39 - 19 0 0 9 56 18 6 53 59 4 254 -11 10 14 51 9 37 48 10 36 5 9 16 47 - 18 0 0 10 11 55 6 53 58 3 254 -10 10 30 31 9 53 23 10 51 46 9 32 20 - 17 0 0 10 27 57 6 53 58 2 254 -9 10 46 34 10 9 23 11 7 52 9 48 17 - 16 0 0 10 44 23 6 53 57 1 254 -9 11 3 2 10 25 47 11 24 23 10 4 38 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 6028-01064-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 17 56.8157 DE: -15 31 16.951 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 10.7 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (631) Philippina approx. diameter [km]: 58 approx. diameter ["]: .048 distance from Earth [AU]: 1.65500 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 675 number of rejected observations: 62 time covered by the observations: 1907 Mar 22 - 2008 Mar 02 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.016, 106° remarks: * orbital elements for (631) Philippina : Mean anomaly = 0.17814482 deg Arg. of pericenter = 278.72972236 deg Long. of node = 224.77857011 deg Inclination = 18.92890018 deg Eccentricity = 0.08507423 Semimajor axis = 2.79190746 AU Perihelion dist = 2.55438810 AU Mag: H = 8.58, G = 0.15 Epoch of elements : MJD 54870.29400000 TDT (2009 Feb 08.294) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 8 631 Philippina 7h 2.9m UT 10.7 9 17 56.816-15 31 16.95TYC 6028-01064-1 11.1 12.5 58 5.5 1.655 -2.092 9.17 -104.7515 -15.523 77.84 -14.92 7.0476 0.13665 0.45040 -5.69040 1.72327 0.00025 0.00294 2000 0.1160302009 2 8.00000278.729722224.778570 18.9289000.08507423 2.7919075 2.5543881 8.7 5.00.15 RATE 2.1127710 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.027 101 1.57 0.027 0 54776.5020090208_1064-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org