IOTA/IOTA-ES occultation update for (559) Nanon / TYC 5010-00653-1 event on 2008 Mar 29, 12:45 UT Visible from Japan (low altitude) Summary ------- On 2008 Mar 29 UT, the 80 km diameter asteroid (559) Nanon will occult a 10.7 mag star in the constellation Libra for observers along a path across Japan (low altitude). In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 13.4 mag (the magnitude of the asteroid) for at most 16.8 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: 91 * date and approx. time of event: 2008 Mar 29, 12:11 - 2008 Mar 29, 12:53 UT * midpoint of event [JD]: 2454555.021875 * magnitude of target star: 10.7 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 16.8 * Moon: 53 % sunlit, 49° distance * Sun: 138° distance * rough path description: Japan (low altitude) The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .028", 100° ) * approx speed of asteroid's shadow [km/s]: 4.7374 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5010-00653-1 by 559 Nanon on 2008 Mar 29 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 128 44 26 42 0 0 12 53 34 3 99 -32 131 21 34 125 24 32 133 35 42 ... .. .. 134 56 15 41 0 0 12 53 23 8 103 -36 136 46 30 132 54 30 138 28 6 130 36 18 Latitude Latitude Latitude Latitude 135 0 0 40 59 16 12 53 23 8 103 -36 41 21 49 40 36 42 41 44 20 40 14 7 136 0 0 40 47 10 12 53 20 9 104 -37 41 9 47 40 24 31 41 32 23 40 1 52 137 0 0 40 34 23 12 53 17 10 105 -38 40 57 5 40 11 40 41 19 46 39 48 55 138 0 0 40 20 55 12 53 14 11 105 -38 40 43 42 39 58 7 41 6 28 39 35 17 139 0 0 40 6 46 12 53 10 11 106 -39 40 29 38 39 43 52 40 52 29 39 20 57 140 0 0 39 51 54 12 53 6 12 106 -40 40 14 52 39 28 55 40 37 48 39 5 54 141 0 0 39 36 20 12 53 2 13 107 -40 39 59 23 39 13 15 40 22 26 38 50 9 142 0 0 39 20 3 12 52 58 14 108 -41 39 43 12 38 56 52 40 6 21 38 33 39 143 0 0 39 3 2 12 52 53 15 108 -42 39 26 18 38 39 45 39 49 32 38 16 26 144 0 0 38 45 17 12 52 48 15 109 -42 39 8 40 38 21 54 39 32 1 37 58 28 145 0 0 38 26 48 12 52 43 16 109 -43 38 50 17 38 3 17 39 13 45 37 39 45 146 0 0 38 7 33 12 52 37 17 110 -44 38 31 9 37 43 56 38 54 44 37 20 17 147 0 0 37 47 32 12 52 31 18 111 -44 38 11 16 37 23 48 38 34 58 37 0 2 148 0 0 37 26 45 12 52 25 19 111 -45 37 50 36 37 2 53 38 14 25 36 39 0 149 0 0 37 5 11 12 52 18 20 112 -46 37 29 9 36 41 12 37 53 6 36 17 10 150 0 0 36 42 49 12 52 11 20 112 -46 37 6 55 36 18 42 37 31 0 35 54 33 151 0 0 36 19 39 12 52 4 21 113 -47 36 43 53 35 55 23 37 8 6 35 31 6 152 0 0 35 55 39 12 51 56 22 113 -48 36 20 2 35 31 16 36 44 23 35 6 50 153 0 0 35 30 50 12 51 48 23 114 -48 35 55 21 35 6 18 36 19 51 34 41 44 154 0 0 35 5 11 12 51 40 24 115 -49 35 29 50 34 40 29 35 54 28 34 15 47 155 0 0 34 38 40 12 51 31 25 115 -50 35 3 28 34 13 50 35 28 16 33 48 58 156 0 0 34 11 17 12 51 22 26 116 -51 34 36 15 33 46 18 35 1 11 33 21 17 157 0 0 33 43 2 12 51 12 27 116 -51 34 8 9 33 17 54 34 33 15 32 52 44 158 0 0 33 13 54 12 51 2 28 117 -52 33 39 11 32 48 36 34 4 26 32 23 17 159 0 0 32 43 52 12 50 51 29 117 -53 33 9 18 32 18 24 33 34 43 31 52 55 160 0 0 32 12 56 12 50 40 29 117 -53 32 38 32 31 47 18 33 4 6 31 21 39 161 0 0 31 41 4 12 50 29 30 118 -54 32 6 50 31 15 17 32 32 35 30 49 27 162 0 0 31 8 17 12 50 17 31 118 -55 31 34 13 30 42 19 32 0 8 30 16 20 163 0 0 30 34 33 12 50 4 32 119 -55 31 0 39 30 8 25 31 26 45 29 42 15 164 0 0 29 59 52 12 49 51 33 119 -56 30 26 9 29 33 34 30 52 25 29 7 13 165 0 0 29 24 14 12 49 38 34 120 -57 29 50 42 28 57 45 30 17 8 28 31 14 166 0 0 28 47 38 12 49 24 35 120 -58 29 14 16 28 20 58 29 40 53 27 54 16 167 0 0 28 10 3 12 49 10 36 120 -58 28 36 52 27 43 12 29 3 40 27 16 19 168 0 0 27 31 29 12 48 55 37 121 -59 27 58 29 27 4 27 28 25 28 26 37 23 169 0 0 26 51 56 12 48 39 39 121 -60 27 19 7 26 24 43 27 46 17 25 57 28 170 0 0 26 11 23 12 48 23 40 121 -60 26 38 45 25 43 58 27 6 6 25 16 32 171 0 0 25 29 49 12 48 7 41 122 -61 25 57 23 25 2 14 26 24 55 24 34 36 172 0 0 24 47 16 12 47 49 42 122 -62 25 15 1 24 19 29 25 42 44 23 51 40 173 0 0 24 3 42 12 47 32 43 122 -62 24 31 38 23 35 44 24 59 33 23 7 43 174 0 0 23 19 7 12 47 13 44 122 -63 23 47 15 22 50 58 24 15 21 22 22 46 175 0 0 22 33 32 12 46 54 45 122 -63 23 1 52 22 5 11 23 30 9 21 36 48 176 0 0 21 46 57 12 46 35 46 123 -64 22 15 27 21 18 24 22 43 56 20 49 49 177 0 0 20 59 20 12 46 15 47 123 -64 21 28 3 20 30 36 21 56 43 20 1 50 178 0 0 20 10 44 12 45 54 49 123 -65 20 39 38 19 41 48 21 8 29 19 12 50 179 0 0 19 21 8 12 45 32 50 123 -65 19 50 13 18 52 0 20 19 16 18 22 51 180 0 0 18 30 32 12 45 10 51 123 -66 18 59 48 18 1 13 19 29 2 17 31 52 -179 0 0 17 38 57 12 44 48 52 123 -66 18 8 25 17 9 27 18 37 50 16 39 55 -178 0 0 16 46 24 12 44 25 53 123 -66 17 16 3 16 16 43 17 45 40 15 46 59 -177 0 0 15 52 53 12 44 1 54 123 -67 16 22 43 15 23 1 16 52 31 14 53 6 -176 0 0 14 58 26 12 43 37 56 122 -67 15 28 27 14 28 22 15 58 26 13 58 16 -175 0 0 14 3 3 12 43 12 57 122 -67 14 33 15 13 32 48 15 3 24 13 2 31 -174 0 0 13 6 45 12 42 46 58 122 -67 13 37 7 12 36 19 14 7 28 12 5 51 -173 0 0 12 9 33 12 42 20 59 121 -67 12 40 7 11 38 57 13 10 38 11 8 18 -172 0 0 11 11 30 12 41 53 61 121 -67 11 42 14 10 40 43 12 12 55 10 9 54 -171 0 0 10 12 36 12 41 26 62 120 -67 10 43 30 9 41 39 11 14 22 9 10 39 -170 0 0 9 12 53 12 40 58 63 120 -67 9 43 57 8 41 46 10 14 59 8 10 35 -169 0 0 8 12 23 12 40 30 64 119 -67 8 43 37 7 41 5 9 14 48 7 9 45 -168 0 0 7 11 7 12 40 1 66 118 -67 7 42 31 6 39 40 8 13 52 6 8 9 -167 0 0 6 9 8 12 39 31 67 117 -66 6 40 41 5 37 31 7 12 11 5 5 51 -166 0 0 5 6 27 12 39 2 68 116 -66 5 38 10 4 34 41 6 9 49 4 2 51 -165 0 0 4 3 7 12 38 31 69 114 -65 4 34 59 3 31 12 5 6 47 2 59 13 -164 0 0 2 59 11 12 38 1 71 113 -65 3 31 11 2 27 7 4 3 8 1 54 59 -163 0 0 1 54 40 12 37 30 72 111 -64 2 26 48 1 22 27 2 58 53 0 50 11 -162 0 0 0 49 37 12 36 58 73 109 -64 1 21 53 0 17 16 1 54 6 - 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99 0 0 -53 29 2 12 12 40 31 311 -7 -53 2 33 -53 55 34 -52 36 7 -54 22 8 - 98 0 0 -53 52 45 12 12 32 30 310 -7 -53 26 28 -54 19 5 -53 0 14 -54 45 28 - 97 0 0 -54 15 43 12 12 24 30 309 -6 -53 49 37 -54 41 51 -53 23 34 -55 8 3 - 96 0 0 -54 37 55 12 12 16 29 308 -5 -54 12 0 -55 3 52 -53 46 8 -55 29 52 - 95 0 0 -54 59 23 12 12 8 28 307 -5 -54 33 39 -55 25 9 -54 7 58 -55 50 58 - 94 0 0 -55 20 8 12 12 1 28 306 -4 -54 54 35 -55 45 44 -54 29 5 -56 11 22 - 93 0 0 -55 40 11 12 11 54 27 306 -4 -55 14 49 -56 5 36 -54 49 29 -56 31 4 - 92 0 0 -55 59 33 12 11 47 26 305 -3 -55 34 21 -56 24 48 -55 9 11 -56 50 5 - 91 0 0 -56 18 14 12 11 41 26 304 -3 -55 53 12 -56 43 19 -55 28 12 -57 8 26 - 90 0 0 -56 36 16 12 11 34 25 303 -2 -56 11 24 -57 1 11 -55 46 34 -57 26 8 - 89 0 0 -56 53 40 12 11 28 24 302 -2 -56 28 57 -57 18 25 -56 4 16 -57 43 13 - 88 0 0 -57 10 26 12 11 23 24 301 -1 -56 45 52 -57 35 2 -56 21 21 -57 59 40 - 87 0 0 -57 26 35 12 11 17 23 301 -1 -57 2 10 -57 51 2 -56 37 48 -58 15 31 - 86 0 0 -57 42 8 12 11 11 23 300 0 -57 17 52 -58 6 26 -56 53 38 -58 30 46 Uncertainty in time = +/- 10 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 5010-00653-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 22 26.2998 DE: -04 31 12.939 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .025 ) * V mag [mag]: 10.7 * B mag [mag]: 11.7 * Apparent position with proper motion RA(deg): 230.7242180657 DE(deg): -4.5536742470 * Equation of equinoxes (radians) : 0.000041193472695 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (559) Nanon approx. diameter [km]: 80 approx. diameter ["]: .064 distance from Earth [AU]: 1.72700 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 988 number of rejected observations: 92 time covered by the observations: 1905 Mar 08 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.014, 111° remarks: * orbital elements for (559) Nanon : Mean anomaly = 334.53730124 deg Arg. of pericenter = 131.08815372 deg Long. of node = 112.21090529 deg Inclination = 9.31143643 deg Eccentricity = 0.06445129 Semimajor axis = 2.71136947 AU Perihelion dist = 2.53661820 AU Mag: H = 9.48, G = 0.15 Epoch of elements : MJD 54554.53100000 TDT (2008 Mar 29.531) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 29 559 Nanon 12h 31.5m UT 10.7 15 22 26.300- 4 31 12.94TYC 5010-00653-1 11.7 13.4 80 16.8 1.727 -0.564 10.72 -144.5489 -4.523 -6.71 3.65 12.5250 -0.12836 -0.10137 -1.64995 2.10419 -0.00383 -0.00001 2000 333.5370362008 325.00000131.088154112.210905 9.3114360.06445129 2.7113695 2.5366182 9.4 5.00.15 RATE 2.2076030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.028 100 1.50 0.032 0 54523.5020080329_0653-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 17:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org