IOTA/IOTA-ES occultation update for (68) Leto / TYC 0284-00355-1 event on 2023 Apr 22, 06:05 UT Visible from South America Summary ------- On 2023 Apr 22 UT, the 122.4 km diameter asteroid (68) Leto will occult a 11.5 mag star in the constellation Virgo for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.07 mag to 12.08 mag (the magnitude of the asteroid) for at most 10.420 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2023 Apr 22, 05:56 - 2023 Apr 22, 06:15 * geocentric midpoint of event [JD]: 2460056.75410692 * magnitude of target star: 11.52 * magnitude drop [mag]: 1.07 * estimated maximum duration [s]: 10.420 * Moon: 5 % sunlit, 123° distance * Sun: 150° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 118°) * approx speed of asteroid's shadow [km/s]: 11.7467 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0284-00355-1 by 68 Leto on 2023 Apr 22 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 151 0 0 2 19 23 6 14 54.4 1 85 25 2 52 55 1 45 49 2 59 54 1 38 49 .... 152 0 0 2 24 16 6 14 54.2 2 85 24 2 57 47 1 50 42 3 4 46 1 43 42 0.06 153 0 0 2 28 58 6 14 53.9 3 85 23 3 2 29 1 55 25 3 9 28 1 48 24 0.08 154 0 0 2 33 30 6 14 53.4 4 85 22 3 7 0 1 59 57 3 13 59 1 52 57 0.09 155 0 0 2 37 51 6 14 52.7 5 85 21 3 11 21 2 4 19 3 18 20 1 57 19 0.10 156 0 0 2 42 3 6 14 51.8 6 85 20 3 15 32 2 8 31 3 22 31 2 1 31 0.10 157 0 0 2 46 4 6 14 50.8 7 85 19 3 19 33 2 12 32 3 26 32 2 5 33 0.10 158 0 0 2 49 54 6 14 49.6 8 86 18 3 23 23 2 16 23 3 30 22 2 9 24 0.11 159 0 0 2 53 35 6 14 48.3 9 86 17 3 27 3 2 20 4 3 34 2 2 13 4 0.11 160 0 0 2 57 4 6 14 46.8 10 86 16 3 30 32 2 23 34 3 37 31 2 16 35 0.11 161 0 0 3 0 24 6 14 45.1 11 86 15 3 33 51 2 26 54 3 40 50 2 19 54 0.11 162 0 0 3 3 32 6 14 43.3 12 86 14 3 37 0 2 30 3 3 43 58 2 23 3 0.11 163 0 0 3 6 30 6 14 41.3 13 86 13 3 39 57 2 33 1 3 46 56 2 26 2 0.11 164 0 0 3 9 18 6 14 39.2 14 86 12 3 42 45 2 35 49 3 49 43 2 28 50 0.11 165 0 0 3 11 55 6 14 36.9 15 86 11 3 45 21 2 38 26 3 52 19 2 31 27 0.11 166 0 0 3 14 21 6 14 34.4 16 86 10 3 47 47 2 40 53 3 54 45 2 33 54 0.11 167 0 0 3 16 37 6 14 31.8 17 86 9 3 50 3 2 43 9 3 57 1 2 36 10 0.11 168 0 0 3 18 42 6 14 29.1 18 86 9 3 52 7 2 45 14 3 59 5 2 38 15 0.11 169 0 0 3 20 36 6 14 26.2 19 86 8 3 54 1 2 47 8 4 0 59 2 40 9 0.11 170 0 0 3 22 20 6 14 23.1 19 86 7 3 55 45 2 48 52 4 2 43 2 41 53 0.11 171 0 0 3 23 53 6 14 19.9 20 86 6 3 57 18 2 50 25 4 4 15 2 43 26 0.11 172 0 0 3 25 15 6 14 16.5 21 86 5 3 58 40 2 51 48 4 5 37 2 44 49 0.11 173 0 0 3 26 26 6 14 13.0 22 86 4 3 59 51 2 52 59 4 6 49 2 46 0 0.11 174 0 0 3 27 27 6 14 9.4 23 86 3 4 0 52 2 54 0 4 7 49 2 47 1 0.11 175 0 0 3 28 17 6 14 5.6 24 86 2 4 1 42 2 54 50 4 8 39 2 47 52 0.11 176 0 0 3 28 57 6 14 1.6 25 86 1 4 2 21 2 55 30 4 9 19 2 48 31 0.11 177 0 0 3 29 25 6 13 57.5 26 86 0 4 2 50 2 55 59 4 9 47 2 49 0 0.11 178 0 0 3 29 43 6 13 53.3 27 86 -1 4 3 8 2 56 17 4 10 5 2 49 18 0.11 179 0 0 3 29 51 6 13 48.9 28 86 -2 4 3 15 2 56 24 4 10 13 2 49 26 0.11 -180 0 0 3 29 48 6 13 44.4 29 86 -3 4 3 12 2 56 21 4 10 10 2 49 22 0.11 -179 0 0 3 29 34 6 13 39.8 30 86 -4 4 2 58 2 56 7 4 9 56 2 49 9 0.11 -178 0 0 3 29 9 6 13 35.0 31 86 -5 4 2 34 2 55 43 4 9 31 2 48 44 0.11 -177 0 0 3 28 34 6 13 30.1 32 87 -6 4 1 59 2 55 8 4 8 56 2 48 9 0.11 -176 0 0 3 27 49 6 13 25.1 33 87 -7 4 1 13 2 54 22 4 8 11 2 47 24 0.11 -175 0 0 3 26 53 6 13 19.9 34 87 -8 4 0 17 2 53 26 4 7 15 2 46 27 0.11 -174 0 0 3 25 46 6 13 14.6 35 87 -9 3 59 11 2 52 20 4 6 9 2 45 21 0.11 -173 0 0 3 24 29 6 13 9.2 36 87 -10 3 57 54 2 51 2 4 4 52 2 44 4 0.11 -172 0 0 3 23 2 6 13 3.6 37 87 -11 3 56 27 2 49 35 4 3 24 2 42 36 0.11 -171 0 0 3 21 24 6 12 58.0 38 87 -12 3 54 49 2 47 57 4 1 47 2 40 58 0.11 -170 0 0 3 19 36 6 12 52.2 39 87 -13 3 53 1 2 46 9 3 59 59 2 39 10 0.11 -169 0 0 3 17 38 6 12 46.2 40 86 -13 3 51 3 2 44 10 3 58 1 2 37 11 0.11 -168 0 0 3 15 29 6 12 40.2 41 86 -14 3 48 54 2 42 1 3 55 52 2 35 2 0.11 -167 0 0 3 13 10 6 12 34.1 42 86 -15 3 46 36 2 39 42 3 53 34 2 32 43 0.11 -166 0 0 3 10 41 6 12 27.8 43 86 -16 3 44 7 2 37 13 3 51 5 2 30 14 0.11 -165 0 0 3 8 2 6 12 21.4 44 86 -17 3 41 28 2 34 34 3 48 26 2 27 35 0.11 -164 0 0 3 5 13 6 12 14.9 45 86 -18 3 38 39 2 31 44 3 45 37 2 24 45 0.11 -163 0 0 3 2 14 6 12 8.3 46 86 -19 3 35 40 2 28 45 3 42 39 2 21 46 0.11 -162 0 0 2 59 5 6 12 1.6 47 86 -20 3 32 32 2 25 36 3 39 30 2 18 37 0.11 -161 0 0 2 55 46 6 11 54.8 48 86 -21 3 29 13 2 22 17 3 36 11 2 15 17 0.11 -160 0 0 2 52 17 6 11 47.9 49 86 -22 3 25 45 2 18 48 3 32 43 2 11 48 0.11 -159 0 0 2 48 39 6 11 40.9 50 86 -23 3 22 7 2 15 9 3 29 5 2 8 9 0.11 -158 0 0 2 44 51 6 11 33.8 51 86 -24 3 18 19 2 11 20 3 25 17 2 4 21 0.11 -157 0 0 2 40 53 6 11 26.6 52 86 -25 3 14 21 2 7 22 3 21 20 2 0 23 0.11 -156 0 0 2 36 46 6 11 19.3 53 86 -26 3 10 14 2 3 15 3 17 13 1 56 15 0.11 -155 0 0 2 32 29 6 11 11.9 54 85 -27 3 5 58 1 58 58 3 12 57 1 51 58 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-44 -13 10 51 -14 18 13 -13 3 50 -14 25 15 0.12 - 41 0 0 -13 51 44 5 57 12.6 14 279 -43 -13 18 4 -14 25 26 -13 11 4 -14 32 28 0.12 - 40 0 0 -13 58 49 5 57 10.4 13 278 -42 -13 25 10 -14 32 31 -13 18 10 -14 39 32 0.12 - 39 0 0 -14 5 47 5 57 8.3 12 278 -41 -13 32 8 -14 39 28 -13 25 8 -14 46 29 0.12 - 38 0 0 -14 12 37 5 57 6.4 11 278 -40 -13 38 59 -14 46 17 -13 31 58 -14 53 18 0.12 - 37 0 0 -14 19 18 5 57 4.7 10 278 -39 -13 45 41 -14 52 58 -13 38 41 -15 0 0 0.12 - 36 0 0 -14 25 52 5 57 3.1 9 277 -38 -13 52 15 -14 59 31 -13 45 15 -15 6 32 0.12 - 35 0 0 -14 32 17 5 57 1.7 8 277 -37 -13 58 41 -15 5 56 -13 51 41 -15 12 57 0.12 - 34 0 0 -14 38 34 5 57 0.4 8 277 -36 -14 4 58 -15 12 12 -13 57 58 -15 19 13 0.12 - 33 0 0 -14 44 42 5 56 59.2 7 277 -35 -14 11 7 -15 18 20 -14 4 7 -15 25 21 0.12 - 32 0 0 -14 50 42 5 56 58.3 6 276 -34 -14 17 7 -15 24 19 -14 10 8 -15 31 20 0.12 - 31 0 0 -14 56 33 5 56 57.5 5 276 -33 -14 22 59 -15 30 10 -14 15 59 -15 37 10 0.12 - 30 0 0 -15 2 15 5 56 56.8 4 276 -32 -14 28 42 -15 35 51 -14 21 42 -15 42 52 0.12 - 29 0 0 -15 7 49 5 56 56.3 3 276 -31 -14 34 16 -15 41 24 -14 27 16 -15 48 25 0.13 - 28 0 0 -15 13 13 5 56 55.9 2 275 -30 -14 39 40 -15 46 48 -14 32 41 -15 53 48 0.13 - 27 0 0 -15 18 28 5 56 55.7 1 275 -29 -14 44 56 -15 52 2 -14 37 57 -15 59 3 0.15 Uncertainty in time = +/- 3 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: TYC 0284-00355-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 16 09.6096 DE: +04 55 10.042 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 16 09.6095 DE: +04 55 10.042 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (68) Leto asteroid class: approx. diameter [km]: 122 approx. diameter ["]: 0.072 distance from Earth [AU]: 2.33940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#128 date of fit: 2023 Feb 07 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.021", 0.003", 118.446° remarks: * orbital elements for (68)Leto : Mean anomaly = 210.5069183994 deg Arg. of pericenter = 304.7273349474 deg Long. of node = 44.0557532157 deg Inclination = 7.9610962899 deg Eccentricity = 0.1847512062 Semimajor axis = 2.7837875130 AU Perihelion dist = 2.2694794122 AU Mag: H = 7.05, G = 0.05 Epoch of elements : MJD 60056.25395833 TDT (2023 Apr 22.2540) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1282023Feb07,10.42,2023,4,22,6.098566,-0.017122,-0.112435,-6.552174,1.013803,0.002448,-0.001652,0.000001,0.000000 -117.1845,4.7894,88.18,12.12,False TYC 0284-00355-1,12.26933600,4.9194559,0.00,11.52,0.00,0.0,0,,12.28933050,4.7893762,1.07,0.00,0,0,0 68,Leto,12.08,122.4,2.3394,0,0,-1.647,3.81,,6.0,0 0,210.4530,2023,4,22,304.7273,44.0558,7.9611,0.18475,2.78379,2.26948,7.07,5.0,0.15 1.104,0.0207,0.0031,118,0.0075,Known errors,-1.00,-1,-1,-1 20230422_0355-1,60004.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org