IOTA/IOTA-ES occultation update for (29) Amphitrite / UCAC4 308-131511 event on 2022 Oct 13, 23:27 UT Visible from South America Summary ------- On 2022 Oct 13 UT, the 202 km diameter asteroid (29) Amphitrite will occult a 12.4 mag star in the constellation Ophiuchus 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 0.38 mag to 11.46 mag (the magnitude of the asteroid) for at most 6.700 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: 100 * date and approx. time of event: 2022 Oct 13, 23:23 - 2022 Oct 13, 23:31 * geocentric midpoint of event [JD]: 2459866.47737296 * magnitude of target star: 12.41 * magnitude drop [mag]: 0.38 * estimated maximum duration [s]: 6.700 * Moon: 82 % sunlit, 166° distance * Sun: 64° distance * rough path description: South America Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 202 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.009", 93°) * approx speed of asteroid's shadow [km/s]: 30.1461 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 308-131511 by 29 Amphitrite on 2022 Oct 13 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 158 0 0 - 4 5 39 23 23 53.5 0 119 62 - 5 8 12 .. .. .. - 5 20 45 .. .. .. .... 159 0 0 - 4 38 31 23 23 53.6 1 119 63 - 5 41 3 - 3 36 2 - 5 53 37 - 3 23 30 0.15 160 0 0 - 5 11 20 23 23 53.7 2 118 64 - 6 13 51 - 4 8 52 - 6 26 24 - 3 56 21 0.10 161 0 0 - 5 44 4 23 23 54.0 4 118 65 - 6 46 34 - 4 41 38 - 6 59 7 - 4 29 7 0.09 162 0 0 - 6 16 43 23 23 54.3 5 118 67 - 7 19 12 - 5 14 19 - 7 31 44 - 5 1 48 0.08 163 0 0 - 6 49 16 23 23 54.6 6 118 68 - 7 51 43 - 5 46 54 - 8 4 15 - 5 34 23 0.07 164 0 0 - 7 21 42 23 23 55.1 7 118 69 - 8 24 6 - 6 19 22 - 8 36 37 - 6 6 52 0.07 165 0 0 - 7 53 59 23 23 55.7 8 118 70 - 8 56 20 - 6 51 42 - 9 8 51 - 6 39 13 0.07 166 0 0 - 8 26 8 23 23 56.3 9 118 71 - 9 28 26 - 7 23 54 - 9 40 56 - 7 11 25 0.06 167 0 0 - 8 58 6 23 23 57.0 10 118 72 -10 0 21 - 7 55 55 -10 12 51 - 7 43 27 0.06 168 0 0 - 9 29 54 23 23 57.8 11 117 73 -10 32 5 - 8 27 47 -10 44 34 - 8 15 19 0.06 169 0 0 -10 1 30 23 23 58.7 13 117 74 -11 3 37 - 8 59 27 -11 16 5 - 8 47 0 0.06 170 0 0 -10 32 53 23 23 59.6 14 117 74 -11 34 56 - 9 30 55 -11 47 23 - 9 18 29 0.06 171 0 0 -11 4 4 23 24 0.6 15 117 75 -12 6 1 -10 2 9 -12 18 28 - 9 49 45 0.06 172 0 0 -11 34 59 23 24 1.7 16 117 76 -12 36 52 -10 33 10 -12 49 18 -10 20 46 0.06 173 0 0 -12 5 41 23 24 2.9 17 116 77 -13 7 28 -11 3 56 -13 19 52 -10 51 34 0.06 174 0 0 -12 36 6 23 24 4.1 18 116 78 -13 37 48 -11 34 27 -13 50 11 -11 22 6 0.06 175 0 0 -13 6 15 23 24 5.4 19 116 78 -14 7 51 -12 4 42 -14 20 13 -11 52 21 0.06 176 0 0 -13 36 6 23 24 6.8 20 116 79 -14 37 37 -12 34 40 -14 49 58 -12 22 20 0.06 177 0 0 -14 5 40 23 24 8.2 21 116 80 -15 7 4 -13 4 20 -15 19 24 -12 52 1 0.05 178 0 0 -14 34 56 23 24 9.7 23 115 80 -15 36 13 -13 33 41 -15 48 32 -13 21 25 0.05 179 0 0 -15 3 52 23 24 11.3 24 115 81 -16 5 3 -14 2 44 -16 17 20 -13 50 29 0.05 -180 0 0 -15 32 29 23 24 12.9 25 115 81 -16 33 33 -14 31 28 -16 45 48 -14 19 14 0.05 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- 8 44 18 - 6 39 33 - 8 56 49 - 6 27 3 0.06 - 34 0 0 - 7 9 28 23 30 49.9 14 242 -49 - 8 11 55 - 6 7 6 - 8 24 27 - 5 54 35 0.06 - 33 0 0 - 6 36 56 23 30 50.8 13 242 -50 - 7 39 25 - 5 34 30 - 7 51 57 - 5 21 59 0.06 - 32 0 0 - 6 4 16 23 30 51.7 12 242 -52 - 7 6 47 - 5 1 49 - 7 19 20 - 4 49 17 0.07 - 31 0 0 - 5 31 30 23 30 52.6 11 242 -53 - 6 34 3 - 4 29 1 - 6 46 36 - 4 16 29 0.07 - 30 0 0 - 4 58 39 23 30 53.3 10 242 -54 - 6 1 13 - 3 56 9 - 6 13 47 - 3 43 37 0.07 - 29 0 0 - 4 25 44 23 30 54.0 8 242 -55 - 5 28 19 - 3 23 13 - 5 40 53 - 3 10 41 0.07 - 28 0 0 - 3 52 46 23 30 54.6 7 242 -56 - 4 55 22 - 2 50 15 - 5 7 56 - 2 37 42 0.08 - 27 0 0 - 3 19 46 23 30 55.1 6 242 -57 - 4 22 22 - 2 17 14 - 4 34 56 - 2 4 42 0.08 - 26 0 0 - 2 46 45 23 30 55.5 5 242 -58 - 3 49 20 - 1 44 13 - 4 1 54 - 1 31 41 0.09 - 25 0 0 - 2 13 43 23 30 55.8 4 242 -59 - 3 16 18 - 1 11 12 - 3 28 52 - 0 58 40 0.10 - 24 0 0 - 1 40 43 23 30 56.0 3 241 -61 - 2 43 17 - 0 38 12 - 2 55 51 - 0 25 40 0.12 - 23 0 0 - 1 7 44 23 30 56.2 2 241 -62 - 2 10 17 - 0 5 14 - 2 22 50 0 7 17 0.17 - 22 0 0 - 0 34 47 23 30 56.3 0 241 -63 - 1 37 19 0 27 40 - 1 49 52 .. .. .. 0.43 Uncertainty in time = +/- 1 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: UCAC4 308-131511 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 32 32.7042 DE: -28 32 36.902 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 32 32.7042 DE: -28 32 36.902 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (29) Amphitrite asteroid class: ShapeModel approx. diameter [km]: 202 approx. diameter ["]: 0.094 distance from Earth [AU]: 2.96860 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#156 date of fit: 2021 Aug 25 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): 0.017", 0.009", 92.639° remarks: * orbital elements for (29)Amphitrite : Mean anomaly = 230.1538324871 deg Arg. of pericenter = 63.0604397769 deg Long. of node = 356.3288346901 deg Inclination = 6.0827754897 deg Eccentricity = 0.0736237921 Semimajor axis = 2.5536797468 AU Perihelion dist = 2.3656681601 AU Mag: H = 5.97, G = 0.20 Epoch of elements : MJD 59865.97736111 TDT (2022 Oct 13.9774) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1562021Aug25,6.70,2022,10,13,23.456951,0.002053,-0.042884,17.004157,0.616300,0.005122,-0.000464,-0.000001,0.000000 -110.8643,-28.5604,-175.32,-8.05,False UCAC4 308-131511,17.54241786,-28.5435838,0.00,12.41,0.00,0.0,0,,17.56596747,-28.5604390,0.38,0.00,0,0,0 29,Amphitrite,11.46,202.0,2.9686,0,0,3.824,1.83,,10.2,0 0,229.9178,2022,10,13,63.0604,356.3288,6.0828,0.07362,2.55368,2.36567,5.97,5.0,0.15 1.100,0.0173,0.0093,93,0.0094,Known errors,-1.00,-1,-1,-1 20221013_131511,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org