IOTA/IOTA-ES occultation update for (1020) Arcadia / TYC 0275-00367-1 event on 2008 May 04, 07:17 UT Visible from New Zealand Summary ------- On 2008 May 04 UT, the 14 km diameter asteroid (1020) Arcadia will occult a 10.1 mag star in the constellation Virgo for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 16.3 mag (the magnitude of the asteroid) for at most 6.0 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: 16 * date and approx. time of event: 2008 May 04, 06:44 - 2008 May 04, 07:26 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 6.0 * Moon: 2 % sunlit, 147° distance * Sun: 131° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 4.17 * 1 sigma uncertainty interval [seconds]: +/- 29.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .036", 106° ) * approx speed of asteroid's shadow [km/s]: 2.3016 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0275-00367-1 by 1020 Arcadia on 2008 May 4 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 152 59 10 -83 0 0 6 44 9 1 59 -14 154 25 39 151 28 28 ... .. .. ... .. .. 162 59 20 -82 0 0 6 44 12 2 49 -15 163 58 2 161 59 21 ... .. .. 152 30 4 169 15 19 -81 0 0 6 44 17 4 43 -16 170 1 42 168 28 18 ... .. .. 161 25 59 173 39 41 -80 0 0 6 44 24 5 39 -17 174 18 42 173 0 17 179 31 15 167 14 29 176 56 4 -79 0 0 6 44 32 6 36 -17 177 30 3 176 21 50 -177 55 19 171 25 5 179 26 44 -78 0 0 6 44 41 7 33 -18 179 57 0 178 56 16 -175 56 56 174 34 22 -178 35 21 -77 0 0 6 44 52 8 31 -19 -178 7 57 -179 2 53 -174 24 20 177 1 33 -177 1 52 -76 0 0 6 45 3 9 30 -19 -176 36 47 -177 27 5 -173 11 21 178 58 8 -175 47 17 -75 0 0 6 45 16 10 28 -20 -175 24 5 -176 10 34 -172 13 44 -179 28 28 -174 47 38 -74 0 0 6 45 30 11 27 -20 -174 26 2 -175 9 19 -171 28 24 -178 13 12 -174 0 6 -73 0 0 6 45 45 12 27 -21 -173 39 50 -174 20 25 -170 53 7 -177 12 25 -173 22 31 -72 0 0 6 46 2 13 26 -21 -173 3 25 -173 41 39 -170 26 9 -176 23 28 -172 53 15 -71 0 0 6 46 19 14 26 -21 -172 35 11 -173 11 22 -170 6 10 -175 44 19 -172 31 3 -70 0 0 6 46 38 15 25 -22 -172 13 52 -172 48 15 -169 52 9 -175 13 27 -172 14 53 -69 0 0 6 46 57 16 25 -22 -171 58 30 -172 31 17 -169 43 16 -174 49 37 -172 3 57 -68 0 0 6 47 18 17 25 -23 -171 48 17 -172 19 39 -169 38 52 -174 31 52 -171 57 36 -67 0 0 6 47 40 18 25 -23 -171 42 35 -172 12 39 -169 38 22 -174 19 23 -171 55 17 -66 0 0 6 48 3 19 25 -23 -171 40 51 -172 9 46 -169 41 21 -174 11 34 -171 56 35 -65 0 0 6 48 27 20 25 -23 -171 42 39 -172 10 31 -169 47 27 -174 7 52 -172 1 5 -64 0 0 6 48 52 21 25 -24 -171 47 38 -172 14 33 -169 56 20 -174 7 50 -172 8 30 -63 0 0 6 49 18 22 25 -24 -171 55 29 -172 21 32 -170 7 46 -174 11 7 -172 18 34 -62 0 0 6 49 45 23 25 -24 -172 5 57 -172 31 12 -170 21 30 -174 17 23 -172 31 3 -61 0 0 6 50 13 24 26 -24 -172 18 48 -172 43 19 -170 37 21 -174 26 24 -172 45 45 -60 0 0 6 50 42 25 26 -24 -172 33 50 -172 57 41 -170 55 10 -174 37 54 -173 2 31 -59 0 0 6 51 13 25 26 -24 -172 50 55 -173 14 8 -171 14 48 -174 51 43 -173 21 12 -58 0 0 6 51 44 26 27 -24 -173 9 53 -173 32 31 -171 36 8 -175 7 41 -173 41 40 -57 0 0 6 52 16 27 27 -24 -173 30 37 -173 52 44 -171 59 4 -175 25 38 -174 3 49 -56 0 0 6 52 49 28 28 -24 -173 53 1 -174 14 38 -172 23 30 -175 45 27 -174 27 34 -55 0 0 6 53 24 29 28 -24 -174 16 59 -174 38 9 -172 49 22 -176 7 2 -174 52 49 -54 0 0 6 53 59 30 29 -24 -174 42 27 -175 3 11 -173 16 36 -176 30 16 -175 19 30 -53 0 0 6 54 35 30 29 -24 -175 9 21 -175 29 41 -173 45 7 -176 55 6 -175 47 35 -52 0 0 6 55 12 31 30 -24 -175 37 36 -175 57 34 -174 14 54 -177 21 25 -176 16 58 -51 0 0 6 55 50 32 31 -24 -176 7 10 -176 26 47 -174 45 52 -177 49 12 -176 47 38 -50 0 0 6 56 29 33 31 -24 -176 37 59 -176 57 17 -175 18 1 -178 18 21 -177 19 32 -49 0 0 6 57 9 33 32 -24 -177 10 2 -177 29 2 -175 51 17 -178 48 52 -177 52 38 -48 0 0 6 57 50 34 33 -23 -177 43 16 -178 2 0 -176 25 40 -179 20 40 -178 26 54 -47 0 0 6 58 32 35 34 -23 -178 17 40 -178 36 9 -177 1 8 -179 53 44 -179 2 19 -46 0 0 6 59 14 35 35 -23 -178 53 12 -179 11 26 -177 37 39 179 31 58 -179 38 51 -45 0 0 6 59 58 36 36 -23 -179 29 51 -179 47 52 -178 15 13 178 56 28 179 43 30 -44 0 0 7 0 42 37 37 -22 179 52 24 179 34 35 -178 53 48 178 19 46 179 4 45 -43 0 0 7 1 27 37 37 -22 179 13 33 178 55 56 -179 33 26 177 41 54 178 24 55 -42 0 0 7 2 14 38 38 -22 178 33 38 178 16 11 179 45 56 177 2 52 177 44 0 -41 0 0 7 3 0 38 40 -21 177 52 39 177 35 21 179 4 17 176 22 42 177 2 1 -40 0 0 7 3 48 39 41 -21 177 10 35 176 53 26 178 21 38 175 41 23 176 18 57 -39 0 0 7 4 37 39 42 -20 176 27 27 176 10 26 177 37 58 174 58 55 175 34 48 -38 0 0 7 5 26 40 43 -20 175 43 15 175 26 21 176 53 16 174 15 19 174 49 34 -37 0 0 7 6 16 40 44 -19 174 57 58 174 41 10 176 7 33 173 30 34 174 3 15 -36 0 0 7 7 7 41 45 -19 174 11 36 173 54 53 175 20 48 172 44 39 173 15 49 -35 0 0 7 7 58 41 46 -18 173 24 7 173 7 29 174 33 0 171 57 35 172 27 15 -34 0 0 7 8 51 41 48 -17 172 35 32 172 18 58 173 44 8 171 9 19 171 37 34 -33 0 0 7 9 44 42 49 -17 171 45 49 171 29 18 172 54 11 170 19 52 170 46 42 -32 0 0 7 10 37 42 50 -16 170 54 56 170 38 27 172 3 7 169 29 11 169 54 39 -31 0 0 7 11 32 42 52 -15 170 2 53 169 46 26 171 10 56 168 37 15 169 1 24 -30 0 0 7 12 27 42 53 -15 169 9 37 168 53 10 170 17 36 167 44 3 168 6 53 -29 0 0 7 13 23 42 54 -14 168 15 6 167 58 40 169 23 4 166 49 32 167 11 6 -28 0 0 7 14 19 42 56 -13 167 19 19 167 2 52 168 27 19 165 53 40 166 13 58 -27 0 0 7 15 16 43 57 -12 166 22 12 166 5 44 167 30 19 164 56 24 165 15 29 -26 0 0 7 16 14 42 59 -11 165 23 44 165 7 13 166 31 59 163 57 42 164 15 33 -25 0 0 7 17 12 42 60 -11 164 23 50 164 7 16 165 32 18 162 57 29 163 14 9 -24 0 0 7 18 11 42 61 -10 163 22 28 163 5 49 164 31 13 161 55 43 162 11 11 -23 0 0 7 19 10 42 63 -9 162 19 33 162 2 49 163 28 38 160 52 18 161 6 36 -22 0 0 7 20 11 42 64 -8 161 15 1 160 58 10 162 24 32 159 47 11 160 0 18 -21 0 0 7 21 11 42 66 -7 160 8 46 159 51 48 161 18 48 158 40 15 158 52 11 -20 0 0 7 22 12 41 67 -6 159 0 44 158 43 37 160 11 21 157 31 24 157 42 10 -19 0 0 7 23 14 41 69 -5 157 50 49 157 33 31 159 2 6 156 20 31 156 30 7 -18 0 0 7 24 16 40 70 -3 156 38 52 156 21 22 157 50 56 155 7 29 155 15 54 -17 0 0 7 25 19 40 71 -2 155 24 45 155 7 2 156 37 43 153 52 8 153 59 21 -16 0 0 7 26 22 39 73 -1 154 8 20 153 50 21 155 22 20 152 34 18 Uncertainty in time = +/- 33 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 0275-00367-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 43 15.6321 DE: +02 57 17.464 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.1 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1020) Arcadia approx. diameter [km]: 14 approx. diameter ["]: .010 distance from Earth [AU]: 1.91900 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 987 number of rejected observations: 16 time covered by the observations: 1924 Mar 08 - 2008 Apr 01 1 sigma uncertainty ellipse (major, minor, PA): 0.050, 0.030, 109° remarks: * orbital elements for (1020) Arcadia : Mean anomaly = 335.71224187 deg Arg. of pericenter = 36.88932544 deg Long. of node = 180.82094128 deg Inclination = 4.05058675 deg Eccentricity = 0.03944569 Semimajor axis = 2.78983394 AU Perihelion dist = 2.67978701 AU Mag: H = 12.06, G = 0.15 Epoch of elements : MJD 54590.30400000 TDT (2008 May 04.304) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 4 1020 Arcadia 7h 15.2m UT 10.1 11 43 15.632 2 57 17.46TYC 0275-00367-1 10.5 16.3 14 6.0 1.919 -0.262 4.45 -155.5354 2.953 70.39 16.10 7.2534 -0.55202 -0.48720 -0.86124 0.97257 0.00388 -0.00176 2000 335.6479422008 5 4.00000 36.889325180.820941 4.0505870.03944569 2.7898339 2.679787011.9 5.00.15 RATE 2.1151280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.036 106 5.17 0.042 0 54579.5020080504_0367-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org