IOTA/IOTA-ES occultation update for (1484) Postrema / UCAC4 562-008974 event on 2023 Jan 03, 22:24 UT Visible from S Africa, South America Summary ------- On 2023 Jan 03 UT, the 45.1 km diameter asteroid (1484) Postrema will occult a 11.8 mag star in the constellation Taurus for observers along a path across S Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.85 mag to 15.63 mag (the magnitude of the asteroid) for at most 4.530 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: 96 * date and approx. time of event: 2023 Jan 03, 22:15 - 2023 Jan 03, 22:33 * geocentric midpoint of event [JD]: 2459948.43357875 * magnitude of target star: 11.81 * magnitude drop [mag]: 3.85 * estimated maximum duration [s]: 4.530 * Moon: 92 % sunlit, 6° distance * Sun: 141° distance * rough path description: S Africa, South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 60°) * approx speed of asteroid's shadow [km/s]: 9.9503 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 562-008974 by 1484 Postrema on 2023 Jan 3 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 -101 0 0 -19 18 52 22 32 53.9 1 66 38 -19 2 2 -19 35 46 -18 48 7 -19 49 50 .... -100 0 0 -18 54 18 22 32 53.7 2 66 37 -18 37 32 -19 11 9 -18 23 41 -19 25 10 0.41 - 99 0 0 -18 30 15 22 32 53.1 3 65 36 -18 13 32 -18 47 2 -17 59 44 -19 0 59 0.55 - 98 0 0 -18 6 41 22 32 52.4 4 65 35 -17 50 2 -18 23 25 -17 36 17 -18 37 19 0.62 - 97 0 0 -17 43 38 22 32 51.4 5 65 34 -17 27 3 -18 0 18 -17 13 20 -18 14 10 0.65 - 96 0 0 -17 21 6 22 32 50.1 6 65 33 -17 4 34 -17 37 42 -16 50 55 -17 51 31 0.67 - 95 0 0 -16 59 5 22 32 48.6 7 64 32 -16 42 37 -17 15 38 -16 29 0 -17 29 24 0.69 - 94 0 0 -16 37 36 22 32 46.8 8 64 31 -16 21 11 -16 54 5 -16 7 37 -17 7 48 0.70 - 93 0 0 -16 16 38 22 32 44.8 9 64 30 -16 0 16 -16 33 4 -15 46 45 -16 46 44 0.71 - 92 0 0 -15 56 13 22 32 42.6 10 63 29 -15 39 54 -16 12 35 -15 26 25 -16 26 12 0.71 - 91 0 0 -15 36 19 22 32 40.1 11 63 28 -15 20 4 -15 52 38 -15 6 38 -16 6 13 0.72 - 90 0 0 -15 16 58 22 32 37.4 12 63 27 -15 0 45 -15 33 14 -14 47 22 -15 46 46 0.72 - 89 0 0 -14 58 9 22 32 34.4 13 62 26 -14 42 0 -15 14 22 -14 28 39 -15 27 52 0.73 - 88 0 0 -14 39 53 22 32 31.3 14 62 25 -14 23 47 -14 56 4 -14 10 28 -15 9 31 0.73 - 87 0 0 -14 22 10 22 32 27.8 15 62 24 -14 6 7 -14 38 18 -13 52 51 -14 51 42 0.73 - 86 0 0 -14 5 0 22 32 24.2 16 62 23 -13 48 59 -14 21 5 -13 35 46 -14 34 27 0.73 - 85 0 0 -13 48 23 22 32 20.4 17 61 22 -13 32 25 -14 4 25 -13 19 14 -14 17 45 0.74 - 84 0 0 -13 32 19 22 32 16.3 18 61 21 -13 16 24 -13 48 18 -13 3 15 -14 1 36 0.74 - 83 0 0 -13 16 49 22 32 12.0 18 61 20 -13 0 56 -13 32 45 -12 47 49 -13 46 1 0.74 - 82 0 0 -13 1 52 22 32 7.5 19 60 19 -12 46 1 -13 17 46 -12 32 56 -13 30 59 0.74 - 81 0 0 -12 47 28 22 32 2.9 20 60 18 -12 31 40 -13 3 19 -12 18 36 -13 16 31 0.74 - 80 0 0 -12 33 38 22 31 58.0 21 60 17 -12 17 52 -12 49 27 -12 4 50 -13 2 36 0.74 - 79 0 0 -12 20 21 22 31 52.9 22 59 16 -12 4 37 -12 36 8 -11 51 38 -12 49 15 0.74 - 78 0 0 -12 7 38 22 31 47.6 23 59 15 -11 51 56 -12 23 22 -11 38 58 -12 36 28 0.74 - 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Uncertainty in time = +/- 3 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 562-008974 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 05 24.3323 DE: +22 14 38.216 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 05 24.3322 DE: +22 14 38.216 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1484) Postrema asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.029 distance from Earth [AU]: 2.13000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2022 Nov 22 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", 0.002", 59.595° remarks: * orbital elements for (1484)Postrema : Mean anomaly = 257.7952991728 deg Arg. of pericenter = 126.9874611901 deg Long. of node = 72.6046353848 deg Inclination = 17.2961330713 deg Eccentricity = 0.2064849048 Semimajor axis = 2.7354999330 AU Perihelion dist = 2.1706604898 AU Mag: H = 10.89, G = 0.15 Epoch of elements : MJD 59947.93340278 TDT (2023 Jan 03.9334) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522022Nov22,4.53,2023,1,3,22.405890,-0.163509,-0.577323,-5.402966,1.532979,0.003752,0.000606,0.000001,0.000000 -17.6749,22.3070,-154.94,-22.78,False UCAC4 562-008974,4.09009232,22.2439489,0.00,11.81,0.00,0.0,0,,4.11290685,22.3069840,3.85,0.00,0,0,0 1484,Postrema,15.63,45.1,2.1300,0,0,-1.606,6.33,,2.2,0 0,257.5920,2023,1,3,126.9875,72.6046,17.2961,0.20648,2.73550,2.17066,10.90,5.0,0.15 1.414,0.0167,0.0017,60,0.0121,Known errors,-1.00,-1,-1,-1 20230103_008974,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org