IOTA/IOTA-ES occultation update for (5374) Hokutosei / HIP 98197 event on 2008 May 02, 01:43 UT Visible from Africa Summary ------- On 2008 May 02 UT, the 31 km diameter asteroid (5374) Hokutosei will occult a 8.1 mag star in the constellation Sagittarius 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 8.7 mag to 16.8 mag (the magnitude of the asteroid) for at most 4.1 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: 23 * date and approx. time of event: 2008 May 02, 01:30 - 2008 May 02, 01:47 UT * midpoint of event [JD]: 2454588.57170833 * magnitude of target star: 8.1 * magnitude drop [mag]: 8.7 * estimated maximum duration [s]: 4.1 * Moon: 16 % sunlit, 60° distance * Sun: 106° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 2.95 * 1 sigma uncertainty interval [seconds]: +/- 26.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .105 +/- .063) * 1 sigma uncertainty ellipse (major, minor, PA): ( .113", .046", 66° ) * approx speed of asteroid's shadow [km/s]: 7.6631 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 98197 by 5374 Hokutosei on 2008 May 2 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 - 30 0 0 5 53 16 1 30 51 1 116 -68 5 42 55 6 3 38 .. .. .. 7 5 8 - 29 0 0 5 24 4 1 30 51 2 117 -68 5 13 45 5 34 24 .. .. .. 6 35 41 - 28 0 0 4 55 24 1 30 52 3 117 -69 4 45 7 5 5 42 .. .. .. 6 6 46 - 27 0 0 4 27 16 1 30 53 4 117 -70 4 17 2 4 37 32 .. .. .. 5 38 24 - 26 0 0 3 59 42 1 30 54 5 117 -70 3 49 29 4 9 55 2 49 34 5 10 35 - 25 0 0 3 32 41 1 30 56 6 117 -71 3 22 30 3 42 52 2 22 47 4 43 20 - 24 0 0 3 6 14 1 30 58 7 117 -71 2 56 6 3 16 24 1 56 35 4 16 39 - 23 0 0 2 40 22 1 31 1 8 117 -72 2 30 16 2 50 30 1 30 56 3 50 32 - 22 0 0 2 15 5 1 31 3 9 117 -72 2 5 1 2 25 11 1 5 53 3 25 1 - 21 0 0 1 50 24 1 31 6 11 117 -73 1 40 22 2 0 27 0 41 25 3 0 6 - 20 0 0 1 26 19 1 31 10 12 117 -73 1 16 18 1 36 20 0 17 33 2 35 47 - 19 0 0 1 2 49 1 31 14 13 117 -73 0 52 51 1 12 49 - 0 5 43 2 12 5 - 18 0 0 0 39 57 1 31 18 14 117 -73 0 30 0 0 49 55 - 0 28 23 1 48 59 - 17 0 0 0 17 42 1 31 22 15 117 -73 0 7 47 0 27 37 - 0 50 26 1 26 31 - 16 0 0 - 0 3 57 1 31 27 16 117 -73 - 0 13 50 0 5 57 - 1 11 52 1 4 40 - 15 0 0 - 0 24 57 1 31 32 17 117 -73 - 0 34 49 - 0 15 5 - 1 32 40 0 43 27 - 14 0 0 - 0 45 20 1 31 37 18 117 -72 - 0 55 9 - 0 35 29 - 1 52 51 0 22 52 - 13 0 0 - 1 5 4 1 31 42 19 117 -72 - 1 14 52 - 0 55 16 - 2 12 24 0 2 56 - 12 0 0 - 1 24 11 1 31 48 20 117 -72 - 1 33 57 - 1 14 23 - 2 31 19 - 0 16 21 - 11 0 0 - 1 42 38 1 31 54 21 118 -71 - 1 52 23 - 1 32 52 - 2 49 36 - 0 35 0 - 10 0 0 - 2 0 27 1 32 1 22 118 -71 - 2 10 10 - 1 50 43 - 3 7 15 - 0 52 59 - 9 0 0 - 2 17 37 1 32 8 23 118 -70 - 2 27 18 - 2 7 54 - 3 24 14 - 1 10 20 - 8 0 0 - 2 34 7 1 32 15 24 118 -70 - 2 43 47 - 2 24 26 - 3 40 35 - 1 27 0 - 7 0 0 - 2 49 58 1 32 22 25 118 -69 - 2 59 37 - 2 40 19 - 3 56 17 - 1 43 1 - 6 0 0 - 3 5 10 1 32 29 26 118 -68 - 3 14 48 - 2 55 32 - 4 11 19 - 1 58 22 - 5 0 0 - 3 19 42 1 32 37 27 118 -68 - 3 29 19 - 3 10 5 - 4 25 43 - 2 13 3 - 4 0 0 - 3 33 34 1 32 45 28 118 -67 - 3 43 10 - 3 23 59 - 4 39 27 - 2 27 4 - 3 0 0 - 3 46 47 1 32 53 29 118 -66 - 3 56 21 - 3 37 12 - 4 52 31 - 2 40 24 - 2 0 0 - 3 59 19 1 33 2 30 118 -65 - 4 8 52 - 3 49 46 - 5 4 56 - 2 53 4 - 1 0 0 - 4 11 11 1 33 11 31 118 -65 - 4 20 43 - 4 1 39 - 5 16 41 - 3 5 4 0 0 0 - 4 22 23 1 33 20 32 118 -64 - 4 31 54 - 4 12 52 - 5 27 46 - 3 16 23 1 0 0 - 4 32 55 1 33 29 33 119 -63 - 4 42 25 - 4 23 24 - 5 38 12 - 3 27 1 2 0 0 - 4 42 46 1 33 39 34 119 -62 - 4 52 15 - 4 33 16 - 5 47 57 - 3 36 58 3 0 0 - 4 51 57 1 33 48 35 119 -61 - 5 1 25 - 4 42 28 - 5 57 2 - 3 46 14 4 0 0 - 5 0 26 1 33 58 36 119 -60 - 5 9 54 - 4 50 58 - 6 5 27 - 3 54 49 5 0 0 - 5 8 16 1 34 9 37 119 -59 - 5 17 43 - 4 58 48 - 6 13 11 - 4 2 43 6 0 0 - 5 15 24 1 34 19 38 120 -59 - 5 24 50 - 5 5 57 - 6 20 16 - 4 9 55 7 0 0 - 5 21 52 1 34 30 39 120 -58 - 5 31 17 - 5 12 25 - 6 26 39 - 4 16 27 8 0 0 - 5 27 38 1 34 40 40 120 -57 - 5 37 3 - 5 18 12 - 6 32 23 - 4 22 17 9 0 0 - 5 32 43 1 34 52 41 120 -56 - 5 42 8 - 5 23 18 - 6 37 25 - 4 27 25 10 0 0 - 5 37 8 1 35 3 42 121 -55 - 5 46 32 - 5 27 42 - 6 41 47 - 4 31 51 11 0 0 - 5 40 51 1 35 14 43 121 -54 - 5 50 15 - 5 31 26 - 6 45 28 - 4 35 36 12 0 0 - 5 43 52 1 35 26 44 121 -53 - 5 53 16 - 5 34 28 - 6 48 29 - 4 38 39 13 0 0 - 5 46 13 1 35 38 45 122 -52 - 5 55 37 - 5 36 48 - 6 50 48 - 4 41 1 14 0 0 - 5 47 51 1 35 50 46 122 -51 - 5 57 15 - 5 38 27 - 6 52 26 - 4 42 40 15 0 0 - 5 48 49 1 36 2 47 123 -50 - 5 58 12 - 5 39 24 - 6 53 23 - 4 43 37 16 0 0 - 5 49 4 1 36 15 48 123 -49 - 5 58 28 - 5 39 40 - 6 53 39 - 4 43 52 17 0 0 - 5 48 38 1 36 27 48 124 -48 - 5 58 2 - 5 39 13 - 6 53 14 - 4 43 25 18 0 0 - 5 47 30 1 36 40 49 124 -47 - 5 56 54 - 5 38 5 - 6 52 8 - 4 42 15 19 0 0 - 5 45 40 1 36 53 50 125 -46 - 5 55 4 - 5 36 15 - 6 50 19 - 4 40 23 20 0 0 - 5 43 8 1 37 6 51 126 -45 - 5 52 33 - 5 33 42 - 6 47 50 - 4 37 48 21 0 0 - 5 39 54 1 37 20 52 126 -44 - 5 49 19 - 5 30 27 - 6 44 38 - 4 34 31 22 0 0 - 5 35 57 1 37 33 53 127 -43 - 5 45 23 - 5 26 30 - 6 40 45 - 4 30 31 23 0 0 - 5 31 18 1 37 47 53 128 -42 - 5 40 45 - 5 21 51 - 6 36 10 - 4 25 48 24 0 0 - 5 25 57 1 38 1 54 129 -41 - 5 35 24 - 5 16 29 - 6 30 53 - 4 20 22 25 0 0 - 5 19 53 1 38 15 55 130 -40 - 5 29 21 - 5 10 24 - 6 24 54 - 4 14 14 26 0 0 - 5 13 6 1 38 29 56 131 -39 - 5 22 35 - 5 3 37 - 6 18 13 - 4 7 22 27 0 0 - 5 5 37 1 38 43 56 132 -38 - 5 15 7 - 4 56 7 - 6 10 50 - 3 59 46 28 0 0 - 4 57 25 1 38 58 57 133 -36 - 5 6 55 - 4 47 54 - 6 2 44 - 3 51 27 29 0 0 - 4 48 30 1 39 12 58 134 -35 - 4 58 1 - 4 38 58 - 5 53 56 - 3 42 25 30 0 0 - 4 38 52 1 39 27 58 135 -34 - 4 48 24 - 4 29 19 - 5 44 25 - 3 32 40 31 0 0 - 4 28 30 1 39 42 59 137 -33 - 4 38 4 - 4 18 56 - 5 34 12 - 3 22 10 32 0 0 - 4 17 26 1 39 57 60 138 -32 - 4 27 1 - 4 7 50 - 5 23 15 - 3 10 57 33 0 0 - 4 5 38 1 40 12 60 140 -31 - 4 15 14 - 3 56 1 - 5 11 36 - 2 59 0 34 0 0 - 3 53 7 1 40 27 61 141 -30 - 4 2 44 - 3 43 28 - 4 59 14 - 2 46 19 35 0 0 - 3 39 52 1 40 43 61 143 -29 - 3 49 31 - 3 30 12 - 4 46 9 - 2 32 55 36 0 0 - 3 25 54 1 40 58 61 145 -28 - 3 35 34 - 3 16 12 - 4 32 21 - 2 18 46 37 0 0 - 3 11 12 1 41 14 62 147 -27 - 3 20 54 - 3 1 29 - 4 17 50 - 2 3 53 38 0 0 - 2 55 46 1 41 29 62 149 -26 - 3 5 30 - 2 46 2 - 4 2 35 - 1 48 16 39 0 0 - 2 39 37 1 41 45 63 150 -25 - 2 49 22 - 2 29 51 - 3 46 37 - 1 31 55 40 0 0 - 2 22 44 1 42 1 63 153 -24 - 2 32 31 - 2 12 56 - 3 29 56 - 1 14 49 41 0 0 - 2 5 7 1 42 17 63 155 -22 - 2 14 56 - 1 55 17 - 3 12 32 - 0 57 0 42 0 0 - 1 46 47 1 42 33 63 157 -21 - 1 56 37 - 1 36 55 - 2 54 25 - 0 38 26 43 0 0 - 1 27 42 1 42 49 63 159 -20 - 1 37 35 - 1 17 49 - 2 35 34 - 0 19 8 44 0 0 - 1 7 55 1 43 6 63 161 -19 - 1 17 49 - 0 57 59 - 2 16 0 0 0 54 45 0 0 - 0 47 23 1 43 22 63 163 -18 - 0 57 20 - 0 37 26 - 1 55 42 0 21 40 46 0 0 - 0 26 8 1 43 38 63 166 -17 - 0 36 7 - 0 16 9 - 1 34 42 0 43 9 47 0 0 - 0 4 10 1 43 55 63 168 -16 - 0 14 11 0 5 52 - 1 12 59 1 5 23 48 0 0 0 18 31 1 44 11 63 170 -15 0 8 28 0 28 35 - 0 50 32 1 28 20 49 0 0 0 41 56 1 44 27 63 172 -13 0 31 50 0 52 2 - 0 27 23 1 52 1 50 0 0 1 6 3 1 44 44 63 174 -12 0 55 55 1 16 12 - 0 3 32 2 16 24 51 0 0 1 30 53 1 45 0 62 176 -11 1 20 43 1 41 4 0 21 2 2 41 31 52 0 0 1 56 26 1 45 17 62 179 -10 1 46 13 2 6 39 0 46 18 3 7 20 53 0 0 2 22 40 1 45 33 61 181 -9 2 12 25 2 32 56 1 12 16 3 33 52 54 0 0 2 49 36 1 45 50 61 183 -8 2 39 19 2 59 55 1 38 55 4 1 6 55 0 0 3 17 14 1 46 6 60 184 -7 3 6 54 3 27 35 2 6 15 4 29 1 56 0 0 3 45 33 1 46 23 60 186 -5 3 35 10 3 55 56 2 34 16 4 57 38 57 0 0 4 14 31 1 46 39 59 188 -4 4 4 6 4 24 58 3 2 57 5 26 55 58 0 0 4 44 10 1 46 55 59 190 -3 4 33 42 4 54 39 3 32 19 5 56 52 59 0 0 5 14 29 1 47 12 58 191 -2 5 3 58 5 25 0 4 2 19 6 27 29 60 0 0 5 45 26 1 47 28 57 193 -1 5 34 52 5 56 0 4 32 58 6 58 44 Uncertainty in time = +/- 29 secs [Prediction of 2008 Feb 17.0] Data for the target star ------------------------ * name: HIP 98197 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 57 15.4958 DE: -26 13 02.530 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .016, .013 ) * V mag [mag]: 8.1 * B mag [mag]: 8.6 * Apparent position with proper motion RA(deg): 299.4458445707 DE(deg): -26.1951862500 * Equation of equinoxes (radians) : 0.000038747057435 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5374) Hokutosei approx. diameter [km]: 31 approx. diameter ["]: .016 distance from Earth [AU]: 2.71100 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 627 number of rejected observations: 15 time covered by the observations: 1980 Aug 04 - 2007 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.112, 0.044, 65° remarks: * orbital elements for (5374) Hokutosei : Mean anomaly = 75.55706806 deg Arg. of pericenter = 251.63954804 deg Long. of node = 300.11874464 deg Inclination = 12.28515847 deg Eccentricity = 0.09090261 Semimajor axis = 3.18353675 AU Perihelion dist = 2.89414496 AU Mag: H = 11.30, G = 0.15 Epoch of elements : MJD 54588.07200000 TDT (2008 May 02.072) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 2 5374 Hokutosei 1h 43.3m UT 8.1 19 57 15.496-26 13 2.53HIP 98197 8.6 16.8 31 4.1 2.711 0.980 4.75 53.1483 -26.218 153.44 15.45 1.7210 -0.15063 0.42198 4.06995 1.46409 -0.00547 -0.00095 2000 74.1564482008 424.00000251.639548300.118745 12.2851580.09090261 3.1835368 2.894145011.2 5.00.15 RATE 1.7351590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.113 0.046 66 3.95 0.047 0 54513.5020080502__98197 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 03:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org