IOTA/IOTA-ES occultation update for (238) Hypatia / UCAC4 387-088022 event on 2022 Oct 23, 18:04 UT Visible from S Africa Summary ------- On 2022 Oct 23 UT, the 153.7 km diameter asteroid (238) Hypatia will occult a 12.4 mag star in the constellation Serpens for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.81 mag to 14.01 mag (the magnitude of the asteroid) for at most 4.870 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 23, 18:01 - 2022 Oct 23, 18:07 * geocentric midpoint of event [JD]: 2459876.25305771 * magnitude of target star: 12.43 * magnitude drop [mag]: 1.81 * estimated maximum duration [s]: 4.870 * Moon: 4 % sunlit, 82° distance * Sun: 61° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 158 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 31.5614 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 387-088022 by 238 Hypatia on 2022 Oct 23 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 -123 0 0 - 5 1 39 18 1 7.9 0 103 61 - 5 45 45 .. .. .. - 5 49 43 .. .. .. .... -122 0 0 - 5 15 21 18 1 7.9 1 103 62 - 5 59 28 - 4 31 22 - 6 3 26 - 4 27 26 0.21 -121 0 0 - 5 29 12 18 1 8.0 2 103 63 - 6 13 22 - 4 45 12 - 6 17 19 - 4 41 16 0.23 -120 0 0 - 5 43 14 18 1 8.2 3 102 64 - 6 27 25 - 4 59 12 - 6 31 23 - 4 55 15 0.23 -119 0 0 - 5 57 25 18 1 8.5 4 102 65 - 6 41 38 - 5 13 22 - 6 45 36 - 5 9 25 0.24 -118 0 0 - 6 11 46 18 1 8.8 5 102 66 - 6 56 0 - 5 27 41 - 6 59 59 - 5 23 44 0.24 -117 0 0 - 6 26 16 18 1 9.1 6 102 67 - 7 10 32 - 5 42 9 - 7 14 30 - 5 38 12 0.24 -116 0 0 - 6 40 55 18 1 9.6 7 102 68 - 7 25 13 - 5 56 47 - 7 29 11 - 5 52 50 0.24 -115 0 0 - 6 55 43 18 1 10.1 8 102 69 - 7 40 2 - 6 11 33 - 7 44 0 - 6 7 36 0.24 -114 0 0 - 7 10 39 18 1 10.6 9 102 70 - 7 54 59 - 6 26 27 - 7 58 58 - 6 22 30 0.24 -113 0 0 - 7 25 43 18 1 11.3 10 102 71 - 8 10 5 - 6 41 30 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51 48 0.26 48 0 0 -24 28 18 18 7 35.5 13 262 -40 -25 12 8 -23 44 36 -25 16 4 -23 40 42 0.26 49 0 0 -24 17 2 18 7 36.2 12 261 -40 -25 0 53 -23 33 18 -25 4 50 -23 29 24 0.26 50 0 0 -24 5 34 18 7 36.9 11 261 -41 -24 49 27 -23 21 48 -24 53 24 -23 17 53 0.26 51 0 0 -23 53 54 18 7 37.5 10 260 -42 -24 37 49 -23 10 7 -24 41 46 -23 6 12 0.26 52 0 0 -23 42 2 18 7 38.1 9 260 -43 -24 25 59 -22 58 13 -24 29 56 -22 54 18 0.27 53 0 0 -23 29 59 18 7 38.6 8 260 -44 -24 13 58 -22 46 9 -24 17 55 -22 42 13 0.27 54 0 0 -23 17 45 18 7 39.0 7 259 -44 -24 1 46 -22 33 53 -24 5 43 -22 29 57 0.27 55 0 0 -23 5 20 18 7 39.4 6 259 -45 -23 49 22 -22 21 25 -23 53 19 -22 17 30 0.28 56 0 0 -22 52 43 18 7 39.8 5 258 -46 -23 36 48 -22 8 47 -23 40 45 -22 4 52 0.28 57 0 0 -22 39 56 18 7 40.1 4 258 -47 -23 24 2 -21 55 59 -23 28 0 -21 52 3 0.29 58 0 0 -22 26 59 18 7 40.3 3 258 -47 -23 11 7 -21 43 0 -23 15 4 -21 39 4 0.31 59 0 0 -22 13 51 18 7 40.5 2 257 -48 -22 58 0 -21 29 50 -23 1 58 -21 25 54 0.33 60 0 0 -22 0 33 18 7 40.6 1 257 -49 -22 44 44 -21 16 31 -22 48 42 -21 12 34 0.39 61 0 0 -21 47 6 18 7 40.6 0 257 -50 -22 31 18 -21 3 2 -22 35 16 -20 59 5 0.67 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 387-088022 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 00 37.7878 DE: -12 40 33.946 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 00 37.7876 DE: -12 40 33.946 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (238) Hypatia asteroid class: approx. diameter [km]: 154 approx. diameter ["]: 0.064 distance from Earth [AU]: 3.31690 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#102 date of fit: 2022 Sep 21 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): 0.015", 0.002", 89.508° remarks: * orbital elements for (238)Hypatia : Mean anomaly = 262.8228626947 deg Arg. of pericenter = 210.6171461144 deg Long. of node = 183.8673822680 deg Inclination = 12.4154296266 deg Eccentricity = 0.0906820575 Semimajor axis = 2.9048533031 AU Perihelion dist = 2.6414352288 AU Mag: H = 8.13, G = 0.15 Epoch of elements : MJD 59875.75305556 TDT (2022 Oct 23.7531) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1022022Sep21,4.87,2022,10,23,18.073385,-0.035401,-0.232479,17.618561,-2.632242,0.005110,0.000560,-0.000001,0.000000 -32.7642,-12.6764,-95.02,-11.58,False UCAC4 387-088022,18.01049660,-12.6760962,0.00,12.43,0.00,0.0,0,,18.03143868,-12.6764421,1.81,0.00,0,0,0 238,Hypatia,14.01,153.7,3.3169,0,0,3.192,-6.98,,7.6,0 0,262.6729,2022,10,23,210.6171,183.8674,12.4154,0.09068,2.90485,2.64144,8.15,5.0,0.15 1.045,0.0147,0.0017,90,0.0029,Known errors,-1.00,-1,-1,-1 20221023_088022,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org