IOTA/IOTA-ES occultation update for (5468) Hamatonbetsu / TYC 1442-01630-1 event on 2008 May 21, 03:57 UT Visible from Caribbean, USA, Canada Summary ------- On 2008 May 21 UT, the 22 km diameter asteroid (5468) Hamatonbetsu will occult a 9.3 mag star in the constellation Coma Berenices for observers along a path across Caribbean, USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.4 mag to 15.7 mag (the magnitude of the asteroid) for at most 3.1 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: UCAC. The event at a glimpse ---------------------- * Rank: 6 * date and approx. time of event: 2008 May 21, 03:51 - 2008 May 21, 04:09 UT * magnitude of target star: 9.3 * magnitude drop [mag]: 6.4 * estimated maximum duration [s]: 3.1 * Moon: 99 % sunlit, 79° distance * Sun: 115° distance * rough path description: Caribbean, USA, Canada Additional comments ------------------- 0.4" double star (m9.9/m10.3) The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 11.46 * 1 sigma uncertainty interval [seconds]: +/- 33.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .207 +/- .205) * 1 sigma uncertainty ellipse (major, minor, PA): ( .207", .205", 90° ) * approx speed of asteroid's shadow [km/s]: 7.1179 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1442-01630-1 by 5468 Hamatonbetsu on 2008 May 21 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 ' " Longitude Longitude Longitude Longitude - 32 37 58 - 8 0 0 4 9 58 1 286 -58 - 33 4 16 - 32 11 3 ... .. .. ... .. .. - 35 42 33 - 7 0 0 4 9 55 4 286 -60 - 36 5 5 - 35 19 38 ... .. .. ... .. .. Latitude Latitude Latitude Latitude - 37 0 0 - 6 31 38 4 9 53 6 286 -61 - 6 39 44 - 6 23 31 .. .. .. - 3 12 39 - 38 0 0 - 6 8 19 4 9 50 7 286 -62 - 6 16 29 - 6 0 8 .. .. .. - 2 47 50 - 39 0 0 - 5 43 49 4 9 48 8 286 -62 - 5 52 2 - 5 35 34 .. .. .. - 2 21 44 - 40 0 0 - 5 18 5 4 9 44 9 286 -63 - 5 26 23 - 5 9 47 .. .. .. - 1 54 19 - 41 0 0 - 4 51 8 4 9 41 10 287 -63 - 4 59 29 - 4 42 46 .. .. .. - 1 25 36 - 42 0 0 - 4 22 55 4 9 37 11 287 -64 - 4 31 21 - 4 14 28 .. .. .. - 0 55 30 - 43 0 0 - 3 53 25 4 9 32 12 287 -64 - 4 1 55 - 3 44 54 .. .. .. - 0 24 2 - 44 0 0 - 3 22 36 4 9 27 13 287 -65 - 3 31 11 - 3 14 0 .. .. .. 0 8 51 - 45 0 0 - 2 50 27 4 9 22 15 287 -65 - 2 59 7 - 2 41 46 - 6 12 39 0 43 11 - 46 0 0 - 2 16 57 4 9 16 16 287 -65 - 2 25 42 - 2 8 10 - 5 41 4 1 19 0 - 47 0 0 - 1 42 2 4 9 9 17 287 -66 - 1 50 53 - 1 33 10 - 5 8 12 1 56 19 - 48 0 0 - 1 5 42 4 9 3 18 287 -66 - 1 14 38 - 0 56 44 - 4 34 0 2 35 11 - 49 0 0 - 0 27 55 4 8 55 19 286 -66 - 0 36 57 - 0 18 51 - 3 58 27 3 15 39 - 50 0 0 0 11 22 4 8 47 20 286 -66 0 2 13 0 20 32 - 3 21 31 3 57 43 - 51 0 0 0 52 9 4 8 38 22 286 -66 0 42 54 1 1 26 - 2 43 11 4 41 28 - 52 0 0 1 34 30 4 8 29 23 286 -66 1 25 8 1 43 54 - 2 3 24 5 26 55 - 53 0 0 2 18 26 4 8 19 24 286 -65 2 8 57 2 27 58 - 1 22 9 6 14 6 - 54 0 0 3 4 0 4 8 9 25 286 -65 2 54 22 3 13 39 - 0 39 24 7 3 5 - 55 0 0 3 51 12 4 7 58 26 285 -65 3 41 27 4 1 0 0 4 52 7 53 53 - 56 0 0 4 40 7 4 7 46 28 285 -64 4 30 13 4 50 3 0 50 42 8 46 34 - 57 0 0 5 30 45 4 7 33 29 285 -64 5 20 42 5 40 49 1 38 7 9 41 10 - 58 0 0 6 23 9 4 7 20 30 284 -63 6 12 56 6 33 23 2 27 9 10 37 45 - 59 0 0 7 17 20 4 7 6 31 284 -62 7 6 58 7 27 44 3 17 49 11 36 20 - 60 0 0 8 13 22 4 6 52 32 283 -61 8 2 50 8 23 56 4 10 11 12 36 58 - 61 0 0 9 11 16 4 6 37 34 282 -61 9 0 33 9 22 1 5 4 15 13 39 43 - 62 0 0 10 11 4 4 6 21 35 282 -60 10 0 10 10 22 0 6 0 2 14 44 37 - 63 0 0 11 12 48 4 6 4 36 281 -59 11 1 43 11 23 56 6 57 35 15 51 43 - 64 0 0 12 16 30 4 5 46 37 280 -57 12 5 12 12 27 50 7 56 55 17 1 3 - 65 0 0 13 22 11 4 5 28 39 279 -56 13 10 40 13 33 44 8 58 3 18 12 39 - 66 0 0 14 29 53 4 5 9 40 278 -55 14 18 9 14 41 39 10 1 0 19 26 35 - 67 0 0 15 39 36 4 4 49 41 277 -54 15 27 38 15 51 37 11 5 46 20 42 51 - 68 0 0 16 51 22 4 4 29 42 276 -53 16 39 10 17 3 38 12 12 24 22 1 31 - 69 0 0 18 5 12 4 4 7 43 274 -51 17 52 44 18 17 43 13 20 52 23 22 34 - 70 0 0 19 21 4 4 3 45 44 273 -50 19 8 20 19 33 51 14 31 11 24 46 2 - 71 0 0 20 38 59 4 3 22 46 271 -48 20 25 59 20 52 3 15 43 20 26 11 56 - 72 0 0 21 58 56 4 2 58 47 270 -47 21 45 39 22 12 17 16 57 18 27 40 15 - 73 0 0 23 20 53 4 2 34 48 268 -45 23 7 18 23 34 33 18 13 4 29 10 58 - 74 0 0 24 44 48 4 2 9 48 266 -43 24 30 54 24 58 47 19 30 36 30 44 5 - 75 0 0 26 10 38 4 1 43 49 263 -42 25 56 25 26 24 56 20 49 51 32 19 32 - 76 0 0 27 38 19 4 1 17 50 261 -40 27 23 46 27 52 57 22 10 46 33 57 16 - 77 0 0 29 7 45 4 0 50 51 258 -38 28 52 52 29 22 45 23 33 16 35 37 12 - 78 0 0 30 38 52 4 0 22 51 256 -37 30 23 37 30 54 13 24 57 17 37 19 14 - 79 0 0 32 11 31 3 59 54 52 253 -35 31 55 55 32 27 14 26 22 42 39 3 14 - 80 0 0 33 45 35 3 59 26 52 250 -33 33 29 37 34 1 41 27 49 25 40 49 4 - 81 0 0 35 20 54 3 58 58 53 247 -31 35 4 33 35 37 23 29 17 19 42 36 33 - 82 0 0 36 57 18 3 58 29 53 244 -29 36 40 34 37 14 9 30 46 15 44 25 29 - 83 0 0 38 34 33 3 58 0 53 241 -28 38 17 26 38 51 48 32 16 2 46 15 36 - 84 0 0 40 12 28 3 57 31 53 238 -26 39 54 58 40 30 6 33 46 31 48 6 38 - 85 0 0 41 50 47 3 57 3 52 235 -24 41 32 54 42 8 49 35 17 31 49 58 17 - 86 0 0 43 29 15 3 56 34 52 232 -22 43 11 0 43 47 41 36 48 49 51 50 12 - 87 0 0 45 7 36 3 56 6 52 229 -20 44 48 59 45 26 24 38 20 12 53 42 1 - 88 0 0 46 45 32 3 55 38 51 226 -18 46 26 33 47 4 42 39 51 27 55 33 18 - 89 0 0 48 22 46 3 55 11 50 223 -17 48 3 27 48 42 17 41 22 21 57 23 37 - 90 0 0 49 59 0 3 54 44 50 220 -15 49 39 21 50 18 50 42 52 39 59 12 30 - 91 0 0 51 33 54 3 54 19 49 217 -13 51 13 58 51 54 4 44 22 7 60 59 28 - 92 0 0 53 7 13 3 53 54 48 215 -11 52 47 0 53 27 39 45 50 32 62 44 1 - 93 0 0 54 38 37 3 53 30 47 212 -10 54 18 10 54 59 18 47 17 41 64 25 38 - 94 0 0 56 7 53 3 53 7 46 210 -8 55 47 13 56 28 46 48 43 19 66 3 50 - 95 0 0 57 34 43 3 52 45 45 208 -7 57 13 54 57 55 47 50 7 16 67 38 9 - 96 0 0 58 58 56 3 52 24 44 206 -5 58 37 59 59 20 7 51 29 21 69 8 11 - 97 0 0 60 20 18 3 52 4 43 204 -4 59 59 17 60 41 35 52 49 22 70 33 34 - 98 0 0 61 38 42 3 51 45 42 202 -2 61 17 38 62 0 0 54 7 13 71 54 1 - 99 0 0 62 53 58 3 51 27 41 200 -1 62 32 55 63 15 16 55 22 44 73 9 22 Uncertainty in time = +/- 35 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 1442-01630-1 * constellation : Coma Berenices * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 09 19.7819 DE: +15 24 39.712 * position source: Pos: mpos:UCAC2 pm:UCAC2, pm: , pi: * standard error: RA,DE ["]: ( .200, .200 ) * V mag [mag]: 9.3 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5468) Hamatonbetsu approx. diameter [km]: 22 approx. diameter ["]: .018 distance from Earth [AU]: 1.64300 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 727 number of rejected observations: 11 time covered by the observations: 1951 Aug 08 - 2008 Apr 15 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.046, 94° remarks: * orbital elements for (5468) Hamatonbetsu : Mean anomaly = 358.03758700 deg Arg. of pericenter = 68.40169535 deg Long. of node = 135.36753658 deg Inclination = 11.98599493 deg Eccentricity = 0.21585524 Semimajor axis = 2.88147704 AU Perihelion dist = 2.25949511 AU Mag: H = 12.13, G = 0.15 Epoch of elements : MJD 54607.16500000 TDT (2008 May 21.165) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 5468 Hamatonbetsu 3h 58.1m UT 9.3 12 9 19.782 15 24 39.71TYC 1442-01630-1 10.2 15.7 22 3.1 1.643 1.040 -15.40 -116.3553 15.416 119.63 20.25 3.9678 0.43199 0.42140 2.80587 -2.87534 0.00413 -0.00252 2000 356.5938192008 514.00000 68.401695135.367537 11.9859950.21585524 2.8814770 2.259495111.7 5.00.15 RATE 2.0150290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.207 0.205 90 12.46 0.212 0 54594.5020080521_1630-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org