IOTA/IOTA-ES occultation update for (496) Gryphia / TYC 1367-00338-1 event on 2010 Oct 06, 11:55 UT Visible from Summary ------- On 2010 Oct 06 UT, the 16 km diameter asteroid (496) Gryphia will occult a 9.6 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 15.9 mag (the magnitude of the asteroid) for at most 0.6 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: 22 * date and approx. time of event: 2010 Oct 06, 11:51 - 2010 Oct 06, 11:54 UT * magnitude of target star: 9.6 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 0.6 * Moon: 3 % sunlit, 58° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 3.03 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .032", 1° ) * approx speed of asteroid's shadow [km/s]: 26.1765 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1367-00338-1 by 496 Gryphia on 2010 Oct 6 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 -174 0 0 29 40 24 11 51 28 0 70 -65 29 35 36 29 45 13 .. .. .. 30 14 25 -173 0 0 29 59 23 11 51 28 1 71 -64 29 54 35 30 4 11 .. .. .. 30 33 20 -172 0 0 30 18 4 11 51 28 2 71 -64 30 13 17 30 22 52 29 44 16 30 51 58 -171 0 0 30 36 28 11 51 28 3 72 -63 30 31 41 30 41 15 30 2 43 31 10 19 -170 0 0 30 54 33 11 51 28 4 72 -62 30 49 46 30 59 20 30 20 51 31 28 21 -169 0 0 31 12 20 11 51 29 5 73 -62 31 7 34 31 17 6 30 38 41 31 46 5 -168 0 0 31 29 49 11 51 29 6 73 -61 31 25 3 31 34 35 30 56 13 32 3 30 -167 0 0 31 46 59 11 51 30 7 74 -60 31 42 13 31 51 44 31 13 26 32 20 37 -166 0 0 32 3 50 11 51 30 8 74 -60 31 59 5 32 8 35 31 30 21 32 37 25 -165 0 0 32 20 22 11 51 31 8 75 -59 32 15 38 32 25 7 31 46 56 32 53 54 -164 0 0 32 36 35 11 51 31 9 75 -58 32 31 51 32 41 19 32 3 13 33 10 4 -163 0 0 32 52 29 11 51 32 10 76 -58 32 47 46 32 57 13 32 19 10 33 25 55 -162 0 0 33 8 4 11 51 33 11 76 -57 33 3 21 33 12 47 32 34 48 33 41 26 -161 0 0 33 23 19 11 51 33 12 77 -56 33 18 37 33 28 2 32 50 6 33 56 38 -160 0 0 33 38 15 11 51 34 13 77 -56 33 33 33 33 42 57 33 5 5 34 11 31 -159 0 0 33 52 51 11 51 35 14 78 -55 33 48 9 33 57 33 33 19 44 34 26 4 -158 0 0 34 7 7 11 51 36 15 79 -54 34 2 26 34 11 49 33 34 4 34 40 17 -157 0 0 34 21 4 11 51 37 15 79 -53 34 16 23 34 25 45 33 48 3 34 54 10 -156 0 0 34 34 40 11 51 38 16 80 -53 34 30 0 34 39 21 34 1 43 35 7 44 -155 0 0 34 47 57 11 51 39 17 80 -52 34 43 17 34 52 37 34 15 3 35 20 57 -154 0 0 35 0 54 11 51 40 18 81 -51 34 56 14 35 5 34 34 28 3 35 33 51 -153 0 0 35 13 30 11 51 42 19 82 -51 35 8 51 35 18 10 34 40 42 35 46 24 -152 0 0 35 25 47 11 51 43 20 82 -50 35 21 8 35 30 26 34 53 2 35 58 38 -151 0 0 35 37 43 11 51 44 21 83 -49 35 33 5 35 42 22 35 5 1 36 10 31 -150 0 0 35 49 20 11 51 45 21 83 -48 35 44 42 35 53 58 35 16 40 36 22 5 -149 0 0 36 0 36 11 51 47 22 84 -48 35 55 58 36 5 13 35 27 59 36 33 18 -148 0 0 36 11 32 11 51 48 23 85 -47 36 6 54 36 16 9 35 38 58 36 44 11 -147 0 0 36 22 7 11 51 50 24 85 -46 36 17 30 36 26 44 35 49 36 36 54 44 -146 0 0 36 32 22 11 51 51 25 86 -45 36 27 46 36 36 59 35 59 54 37 4 56 -145 0 0 36 42 17 11 51 53 26 87 -45 36 37 41 36 46 54 36 9 51 37 14 49 -144 0 0 36 51 52 11 51 54 26 87 -44 36 47 17 36 56 28 36 19 29 37 24 21 -143 0 0 37 1 7 11 51 56 27 88 -43 36 56 31 37 5 42 36 28 46 37 33 33 -142 0 0 37 10 1 11 51 58 28 89 -42 37 5 26 37 14 36 36 37 42 37 42 25 -141 0 0 37 18 35 11 51 59 29 89 -41 37 14 0 37 23 9 36 46 19 37 50 56 -140 0 0 37 26 48 11 52 1 30 90 -41 37 22 14 37 31 23 36 54 34 37 59 8 -139 0 0 37 34 42 11 52 3 30 91 -40 37 30 8 37 39 16 37 2 30 38 6 59 -138 0 0 37 42 15 11 52 5 31 91 -39 37 37 41 37 46 48 37 10 5 38 14 30 -137 0 0 37 49 28 11 52 7 32 92 -38 37 44 54 37 54 1 37 17 20 38 21 40 -136 0 0 37 56 20 11 52 9 33 93 -38 37 51 47 38 0 53 37 24 14 38 28 31 -135 0 0 38 2 52 11 52 10 34 93 -37 37 58 19 38 7 25 37 30 48 38 35 1 -134 0 0 38 9 4 11 52 12 34 94 -36 38 4 32 38 13 37 37 37 2 38 41 11 -133 0 0 38 14 56 11 52 14 35 95 -35 38 10 24 38 19 28 37 42 56 38 47 1 -132 0 0 38 20 28 11 52 17 36 96 -35 38 15 55 38 25 0 37 48 29 38 52 31 -131 0 0 38 25 39 11 52 19 37 96 -34 38 21 7 38 30 11 37 53 42 38 57 41 -130 0 0 38 30 30 11 52 21 37 97 -33 38 25 58 38 35 2 37 58 34 39 2 31 -129 0 0 38 35 1 11 52 23 38 98 -32 38 30 29 38 39 32 38 3 6 39 7 0 -128 0 0 38 39 12 11 52 25 39 99 -32 38 34 40 38 43 43 38 7 18 39 11 10 -127 0 0 38 43 2 11 52 27 40 99 -31 38 38 31 38 47 33 38 11 10 39 14 59 -126 0 0 38 46 32 11 52 30 40 100 -30 38 42 1 38 51 3 38 14 41 39 18 28 -125 0 0 38 49 43 11 52 32 41 101 -29 38 45 12 38 54 13 38 17 53 39 21 38 -124 0 0 38 52 33 11 52 34 42 102 -29 38 48 2 38 57 3 38 20 43 39 24 27 -123 0 0 38 55 2 11 52 37 43 103 -28 38 50 32 38 59 33 38 23 14 39 26 56 -122 0 0 38 57 12 11 52 39 44 104 -27 38 52 42 39 1 43 38 25 24 39 29 5 -121 0 0 38 59 2 11 52 41 44 104 -26 38 54 31 39 3 32 38 27 14 39 30 54 -120 0 0 39 0 31 11 52 44 45 105 -26 38 56 1 39 5 1 38 28 44 39 32 22 -119 0 0 39 1 40 11 52 46 46 106 -25 38 57 10 39 6 10 38 29 54 39 33 31 -118 0 0 39 2 29 11 52 49 47 107 -24 38 57 59 39 6 59 38 30 43 39 34 20 -117 0 0 39 2 58 11 52 51 47 108 -23 38 58 28 39 7 28 38 31 12 39 34 49 -116 0 0 39 3 7 11 52 54 48 109 -22 38 58 36 39 7 37 38 31 21 39 34 57 -115 0 0 39 2 55 11 52 56 49 110 -22 38 58 25 39 7 25 38 31 9 39 34 46 -114 0 0 39 2 23 11 52 59 50 111 -21 38 57 53 39 6 54 38 30 38 39 34 14 -113 0 0 39 1 32 11 53 2 50 112 -20 38 57 1 39 6 2 38 29 46 39 33 23 -112 0 0 39 0 20 11 53 4 51 113 -19 38 55 49 39 4 50 38 28 33 39 32 11 -111 0 0 38 58 47 11 53 7 52 114 -19 38 54 17 39 3 18 38 27 0 39 30 39 -110 0 0 38 56 55 11 53 10 52 115 -18 38 52 24 39 1 25 38 25 7 39 28 47 -109 0 0 38 54 42 11 53 13 53 116 -17 38 50 11 38 59 13 38 22 54 39 26 35 -108 0 0 38 52 9 11 53 16 54 117 -16 38 47 38 38 56 40 38 20 20 39 24 3 -107 0 0 38 49 15 11 53 18 55 118 -15 38 44 45 38 53 46 38 17 26 39 21 10 -106 0 0 38 46 2 11 53 21 55 119 -15 38 41 31 38 50 33 38 14 11 39 17 57 -105 0 0 38 42 28 11 53 24 56 120 -14 38 37 57 38 46 59 38 10 36 39 14 24 -104 0 0 38 38 34 11 53 27 57 121 -13 38 34 2 38 43 5 38 6 41 39 10 31 -103 0 0 38 34 19 11 53 30 57 122 -12 38 29 47 38 38 50 38 2 25 39 6 18 -102 0 0 38 29 44 11 53 33 58 124 -12 38 25 12 38 34 15 37 57 49 39 1 44 -101 0 0 38 24 48 11 53 36 59 125 -11 38 20 16 38 29 20 37 52 52 38 56 50 -100 0 0 38 19 32 11 53 39 60 126 -10 38 15 0 38 24 4 37 47 34 38 51 35 - 99 0 0 38 13 56 11 53 42 60 127 -9 38 9 23 38 18 28 37 41 56 38 46 0 - 98 0 0 38 7 59 11 53 45 61 129 -8 38 3 26 38 12 31 37 35 57 38 40 5 - 97 0 0 38 1 41 11 53 48 62 130 -8 37 57 9 38 6 14 37 29 38 38 33 49 - 96 0 0 37 55 3 11 53 52 62 132 -7 37 50 30 37 59 36 37 22 58 38 27 13 - 95 0 0 37 48 5 11 53 55 63 133 -6 37 43 31 37 52 38 37 15 58 38 20 17 - 94 0 0 37 40 45 11 53 58 64 135 -5 37 36 12 37 45 19 37 8 36 38 12 59 - 93 0 0 37 33 5 11 54 1 64 136 -4 37 28 32 37 37 39 37 0 54 38 5 22 - 92 0 0 37 25 5 11 54 4 65 138 -4 37 20 31 37 29 39 36 52 52 37 57 23 - 91 0 0 37 16 44 11 54 8 66 140 -3 37 12 9 37 21 18 36 44 28 37 49 5 - 90 0 0 37 8 2 11 54 11 66 142 -2 37 3 27 37 12 37 36 35 44 37 40 25 - 89 0 0 36 58 59 11 54 14 67 143 -1 36 54 24 37 3 35 36 26 39 37 31 25 - 88 0 0 36 49 36 11 54 18 67 145 0 36 45 0 36 54 12 36 17 13 37 22 4 Uncertainty in time = +/- 2 secs Prediction of 2009 Apr 19.0 Data for the target star ------------------------ * name: TYC 1367-00338-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 54 21.1245 DE: +17 27 38.727 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .032 ) * V mag [mag]: 9.6 * B mag [mag]: 11.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (496) Gryphia approx. diameter [km]: 16 approx. diameter ["]: .011 distance from Earth [AU]: 2.03300 * orbital information: orbit source: Preston date of fit: 2009 Apr 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1007 number of rejected observations: 72 time covered by the observations: 1902 Nov 04 - 2008 Aug 19 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.011, 101° remarks: * orbital elements for (496) Gryphia : Mean anomaly = 344.88112450 deg Arg. of pericenter = 258.78886949 deg Long. of node = 207.66509734 deg Inclination = 3.79143853 deg Eccentricity = 0.07852316 Semimajor axis = 2.19862413 AU Perihelion dist = 2.02598122 AU Mag: H = 11.63, G = 0.15 Epoch of elements : MJD 55475.49700000 TDT (2010 Oct 06.497) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Oct 6 496 Gryphia 11h 55.4m UT 9.6 7 54 21.125 17 27 38.73TYC 1367-00338-1 11.0 15.9 16 0.6 2.033 4.317 -16.41 -75.2945 17.466 -1.80 -5.19 11.9227 0.07135 0.26763 14.27995 -3.79163 -0.00510 0.00092 2000 343.219230201010 1.00000258.788869207.665097 3.7914390.07852316 2.1986241 2.025981211.6 5.00.15 RATE 3.0232750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.032 1 4.03 0.033 0 54940.0020101006_0338-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Apr 18, 22:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org