IOTA/IOTA-ES occultation update for (1518) Rovaniemi / TYC 1886-01180-1 event on 2008 Oct 01, 16:22 UT Visible from New Guinea Summary ------- On 2008 Oct 01 UT, the 12 km diameter asteroid (1518) Rovaniemi will occult a 9.1 mag star in the constellation Auriga for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 16.0 mag (the magnitude of the asteroid) for at most 0.7 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: 30 * date and approx. time of event: 2008 Oct 01, 16:16 - 2008 Oct 01, 16:22 UT * magnitude of target star: 9.1 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 0.7 * Moon: 6 % sunlit, 121° distance * Sun: 94° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 2.21 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .024", 89° ) * approx speed of asteroid's shadow [km/s]: 17.5842 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1886-01180-1 by 1518 Rovaniemi on 2008 Oct 1 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 120 0 0 -14 59 42 16 16 3 1 61 -70 -15 3 28 -14 55 56 -15 20 5 -14 39 20 121 0 0 -14 26 48 16 16 3 2 60 -71 -14 30 34 -14 23 3 -14 47 13 -14 6 25 122 0 0 -13 53 41 16 16 4 3 60 -71 -13 57 27 -13 49 55 -14 14 7 -13 33 16 123 0 0 -13 20 20 16 16 4 4 60 -71 -13 24 6 -13 16 33 -13 40 47 -12 59 53 124 0 0 -12 46 46 16 16 5 5 60 -71 -12 50 33 -12 42 59 -13 7 14 -12 26 19 125 0 0 -12 13 1 16 16 5 6 59 -71 -12 16 48 -12 9 14 -12 33 30 -11 52 33 126 0 0 -11 39 5 16 16 6 7 59 -70 -11 42 52 -11 35 18 -11 59 36 -11 18 36 127 0 0 -11 5 0 16 16 7 9 59 -70 -11 8 47 -11 1 13 -11 25 31 -10 44 30 128 0 0 -10 30 46 16 16 8 10 59 -70 -10 34 33 -10 26 59 -10 51 18 -10 10 15 129 0 0 - 9 56 24 16 16 10 11 59 -69 -10 0 12 - 9 52 37 -10 16 57 - 9 35 53 130 0 0 - 9 21 56 16 16 11 12 58 -69 - 9 25 44 - 9 18 9 - 9 42 29 - 9 1 25 131 0 0 - 8 47 22 16 16 13 13 58 -69 - 8 51 10 - 8 43 35 - 9 7 55 - 8 26 50 132 0 0 - 8 12 44 16 16 14 14 58 -68 - 8 16 32 - 8 8 57 - 8 33 17 - 7 52 12 133 0 0 - 7 38 2 16 16 16 15 58 -67 - 7 41 50 - 7 34 15 - 7 58 35 - 7 17 30 134 0 0 - 7 3 18 16 16 18 17 58 -67 - 7 7 5 - 6 59 31 - 7 23 51 - 6 42 46 135 0 0 - 6 28 32 16 16 20 18 58 -66 - 6 32 20 - 6 24 45 - 6 49 5 - 6 8 1 136 0 0 - 5 53 47 16 16 23 19 58 -65 - 5 57 34 - 5 49 59 - 6 14 19 - 5 33 15 137 0 0 - 5 19 2 16 16 25 20 57 -65 - 5 22 49 - 5 15 15 - 5 39 34 - 4 58 31 138 0 0 - 4 44 19 16 16 28 21 57 -64 - 4 48 6 - 4 40 32 - 5 4 50 - 4 23 48 139 0 0 - 4 9 39 16 16 31 22 57 -63 - 4 13 26 - 4 5 52 - 4 30 9 - 3 49 9 140 0 0 - 3 35 3 16 16 34 24 57 -62 - 3 38 50 - 3 31 16 - 3 55 33 - 3 14 34 141 0 0 - 3 0 32 16 16 37 25 57 -61 - 3 4 19 - 2 56 46 - 3 21 1 - 2 40 5 142 0 0 - 2 26 8 16 16 40 26 57 -61 - 2 29 55 - 2 22 22 - 2 46 36 - 2 5 42 143 0 0 - 1 51 51 16 16 43 27 57 -60 - 1 55 37 - 1 48 5 - 2 12 18 - 1 31 26 144 0 0 - 1 17 43 16 16 46 28 57 -59 - 1 21 29 - 1 13 57 - 1 38 8 - 0 57 19 145 0 0 - 0 43 44 16 16 50 29 57 -58 - 0 47 30 - 0 39 58 - 1 4 7 - 0 23 21 146 0 0 - 0 9 55 16 16 54 30 57 -57 - 0 13 41 - 0 6 10 - 0 30 17 0 10 25 147 0 0 0 23 41 16 16 58 32 57 -56 0 19 56 0 27 26 0 3 21 0 44 1 148 0 0 0 57 6 16 17 1 33 57 -55 0 53 21 1 0 50 0 36 47 1 17 23 149 0 0 1 30 16 16 17 6 34 57 -54 1 26 32 1 34 1 1 10 0 1 50 32 150 0 0 2 3 13 16 17 10 35 57 -53 1 59 29 2 6 57 1 42 58 2 23 26 151 0 0 2 35 54 16 17 14 36 56 -52 2 32 10 2 39 37 2 15 41 2 56 5 152 0 0 3 8 18 16 17 18 37 56 -51 3 4 35 3 12 1 2 48 8 3 28 27 153 0 0 3 40 25 16 17 23 39 56 -50 3 36 43 3 44 8 3 20 17 4 0 32 154 0 0 4 12 14 16 17 28 40 56 -49 4 8 32 4 15 57 3 52 9 4 32 19 155 0 0 4 43 45 16 17 32 41 56 -48 4 40 3 4 47 27 4 23 42 5 3 47 156 0 0 5 14 55 16 17 37 42 56 -47 5 11 14 5 18 37 4 54 55 5 34 55 157 0 0 5 45 45 16 17 42 43 56 -46 5 42 4 5 49 26 5 25 47 6 5 42 158 0 0 6 16 14 16 17 47 44 56 -45 6 12 33 6 19 54 5 56 18 6 36 8 159 0 0 6 46 20 16 17 52 45 56 -44 6 42 40 6 50 0 6 26 28 7 6 12 160 0 0 7 16 4 16 17 57 46 56 -43 7 12 25 7 19 44 6 56 14 7 35 53 161 0 0 7 45 25 16 18 2 48 56 -42 7 41 46 7 49 4 7 25 38 8 5 11 162 0 0 8 14 21 16 18 8 49 56 -41 8 10 43 8 18 0 7 54 37 8 34 4 163 0 0 8 42 53 16 18 13 50 56 -40 8 39 15 8 46 31 8 23 12 9 2 33 164 0 0 9 11 0 16 18 19 51 56 -39 9 7 23 9 14 37 8 51 22 9 30 37 165 0 0 9 38 41 16 18 24 52 56 -38 9 35 4 9 42 18 9 19 6 9 58 15 166 0 0 10 5 56 16 18 30 53 56 -37 10 2 20 10 9 32 9 46 24 10 25 27 167 0 0 10 32 44 16 18 35 54 56 -36 10 29 9 10 36 20 10 13 15 10 52 12 168 0 0 10 59 5 16 18 41 55 56 -35 10 55 30 11 2 40 10 39 39 11 18 31 169 0 0 11 24 59 16 18 47 56 56 -34 11 21 24 11 28 33 11 5 36 11 44 21 170 0 0 11 50 24 16 18 53 57 55 -33 11 46 50 11 53 58 11 31 4 12 9 43 171 0 0 12 15 21 16 18 59 58 55 -32 12 11 48 12 18 55 11 56 5 12 34 38 172 0 0 12 39 50 16 19 5 59 55 -31 12 36 17 12 43 23 12 20 36 12 59 3 173 0 0 13 3 50 16 19 10 60 55 -30 13 0 17 13 7 22 12 44 39 13 22 59 174 0 0 13 27 20 16 19 16 62 55 -29 13 23 48 13 30 51 13 8 12 13 46 27 175 0 0 13 50 20 16 19 22 63 54 -28 13 46 49 13 53 52 13 31 16 14 9 24 176 0 0 14 12 51 16 19 29 64 54 -27 14 9 21 14 16 22 13 53 50 14 31 52 177 0 0 14 34 52 16 19 35 65 54 -26 14 31 22 14 38 22 14 15 54 14 53 50 178 0 0 14 56 23 16 19 41 66 53 -25 14 52 53 14 59 52 14 37 27 15 15 18 179 0 0 15 17 23 16 19 47 67 53 -24 15 13 54 15 20 52 14 58 30 15 36 15 180 0 0 15 37 53 16 19 53 68 52 -23 15 34 24 15 41 21 15 19 3 15 56 42 -179 0 0 15 57 52 16 19 59 69 52 -22 15 54 24 16 1 20 15 39 5 16 16 38 -178 0 0 16 17 20 16 20 5 70 51 -21 16 13 52 16 20 47 15 58 36 16 36 3 -177 0 0 16 36 17 16 20 12 70 50 -20 16 32 50 16 39 44 16 17 36 16 54 57 -176 0 0 16 54 43 16 20 18 71 50 -19 16 51 17 16 58 9 16 36 4 17 13 21 -175 0 0 17 12 38 16 20 24 72 49 -18 17 9 12 17 16 4 16 54 2 17 31 13 -174 0 0 17 30 2 16 20 30 73 47 -17 17 26 36 17 33 27 17 11 29 17 48 34 -173 0 0 17 46 54 16 20 36 74 46 -16 17 43 29 17 50 19 17 28 24 18 5 24 -172 0 0 18 3 16 16 20 43 75 45 -15 17 59 51 18 6 40 17 44 47 18 21 43 -171 0 0 18 19 5 16 20 49 76 43 -14 18 15 41 18 22 29 18 0 40 18 37 30 -170 0 0 18 34 24 16 20 55 77 41 -13 18 31 0 18 37 47 18 16 1 18 52 46 -169 0 0 18 49 11 16 21 1 78 39 -12 18 45 48 18 52 34 18 30 50 19 7 31 -168 0 0 19 3 27 16 21 8 78 36 -11 19 0 4 19 6 49 18 45 8 19 21 45 -167 0 0 19 17 11 16 21 14 79 33 -10 19 13 49 19 20 33 18 58 55 19 35 27 -166 0 0 19 30 24 16 21 20 80 30 -9 19 27 2 19 33 46 19 12 10 19 48 38 -165 0 0 19 43 6 16 21 26 80 25 -8 19 39 44 19 46 27 19 24 54 20 1 17 -164 0 0 19 55 16 16 21 33 81 21 -7 19 51 55 19 58 37 19 37 6 20 13 25 -163 0 0 20 6 55 16 21 39 81 16 -6 20 3 34 20 10 16 19 48 47 20 25 2 -162 0 0 20 18 3 16 21 45 82 10 -5 20 14 42 20 21 23 19 59 56 20 36 8 -161 0 0 20 28 39 16 21 51 82 3 -4 20 25 19 20 31 59 20 10 35 20 46 43 -160 0 0 20 38 44 16 21 57 82 357 -3 20 35 25 20 42 4 20 20 42 20 56 47 -159 0 0 20 48 18 16 22 4 82 350 -2 20 44 59 20 51 38 20 30 17 21 6 19 -158 0 0 20 57 21 16 22 10 82 343 -1 20 54 2 21 0 40 20 39 22 21 15 20 -157 0 0 21 5 53 16 22 16 82 336 0 21 2 34 21 9 12 20 47 55 21 23 51 Uncertainty in time = +/- 2 secs [Prediction of 2008 Sep 5.0] Data for the target star ------------------------ * name: TYC 1886-01180-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 22 27.0900 DE: +28 07 23.903 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .018 ) * V mag [mag]: 9.1 * B mag [mag]: 9.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1518) Rovaniemi approx. diameter [km]: 12 approx. diameter ["]: .011 distance from Earth [AU]: 1.56000 * orbital information: orbit source: Preston date of fit: 2008 Sep 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 838 number of rejected observations: 35 time covered by the observations: 1928 Oct 21 - 2007 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.016, 89° remarks: * orbital elements for (1518) Rovaniemi : Mean anomaly = 358.82686487 deg Arg. of pericenter = 37.23047673 deg Long. of node = 27.84499189 deg Inclination = 6.71340510 deg Eccentricity = 0.14296673 Semimajor axis = 2.22541800 AU Perihelion dist = 1.90725728 AU Mag: H = 12.42, G = 0.15 Epoch of elements : MJD 54740.68200000 TDT (2008 Oct 01.682) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 1 1518 Rovaniemi 16h 22.0m UT 9.1 6 22 27.090 28 7 23.90TYC 1886-01180-1 9.1 16.0 12 0.7 1.560 4.169 9.51 -160.6708 28.120 -68.14 -3.51 16.3675 0.02356 -0.12956 9.78065 1.68654 -0.00516 0.00017 2000 358.624390200810 1.00000 37.230477 27.844992 6.7134050.14296673 2.2254180 1.907257312.3 5.00.15 RATE 2.9688390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.024 89 3.21 0.023 0 54714.5020081001_1180-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 05, 06:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org