IOTA/IOTA-ES occultation update for (132) Aethra / UCAC4 554-004655 event on 2024 Jan 19, 12:21 UT Visible from Summary ------- On 2024 Jan 19 UT, the 45.827 km diameter asteroid (132) Aethra will occult a 11.9 mag star in the constellation Aries for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.41 mag to 12.97 mag (the magnitude of the asteroid) for at most 3.750 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: 2024 Jan 19, 12:13 - 2024 Jan 19, 12:28 * geocentric midpoint of event [JD]: 2460329.01460200 * magnitude of target star: 11.91 * magnitude drop [mag]: 1.41 * estimated maximum duration [s]: 3.750 * Moon: 65 % sunlit, 5° distance * Sun: 104° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 100°) * approx speed of asteroid's shadow [km/s]: 12.2348 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 554-004655 by 132 Aethra on 2024 Jan 19 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 - 39 0 0 62 14 17 12 13 31.6 0 41 2 .. .. .. 62 36 25 .. .. .. 62 43 19 .... - 38 0 0 62 46 22 12 13 31.6 1 42 2 62 24 35 63 8 17 62 17 51 63 15 7 -0.57 - 37 0 0 63 17 22 12 13 31.8 2 43 2 62 55 47 63 39 4 62 49 7 63 45 49 -0.58 - 36 0 0 63 47 17 12 13 32.0 2 44 2 63 25 55 64 8 47 63 19 19 64 15 28 -0.59 - 35 0 0 64 16 11 12 13 32.4 3 44 1 63 55 2 64 37 27 63 48 29 64 44 4 -0.59 - 34 0 0 64 44 4 12 13 32.7 3 45 1 64 23 8 65 5 8 64 16 39 65 11 41 -0.59 - 33 0 0 65 10 59 12 13 33.2 4 46 1 64 50 15 65 31 49 64 43 51 65 38 18 -0.59 - 32 0 0 65 36 57 12 13 33.7 5 47 1 65 16 26 65 57 35 65 10 5 66 3 59 -0.59 - 31 0 0 66 2 0 12 13 34.2 5 48 1 65 41 41 66 22 25 65 35 24 66 28 45 -0.59 - 30 0 0 66 26 9 12 13 34.8 6 49 1 66 6 3 66 46 21 65 59 50 66 52 38 -0.59 - 29 0 0 66 49 27 12 13 35.5 6 50 0 66 29 33 67 9 27 66 23 24 67 15 40 -0.59 - 28 0 0 67 11 55 12 13 36.1 7 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0 0 - 9 22 22 12 28 32.5 2 292 -60 - 9 38 1 - 9 6 40 - 9 42 51 - 9 1 47 -0.80 178 0 0 - 9 46 56 12 28 32.8 1 291 -60 -10 2 29 - 9 31 20 -10 7 18 - 9 26 29 -1.01 179 0 0 .. .. .... .. .. .. .. .. .. .. .. .. - 9 55 0 .. .. .. - 9 50 11 .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 554-004655 * constellation : Aries * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 32 24.7948 DE: +20 46 57.885 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 32 24.7946 DE: +20 46 57.884 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (132) Aethra asteroid class: approx. diameter [km]: 46 approx. diameter ["]: 0.037 distance from Earth [AU]: 1.70550 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#74 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): 0.010", 0.003", 99.631° remarks: * orbital elements for (132)Aethra : Mean anomaly = 316.3311609121 deg Arg. of pericenter = 255.5705113327 deg Long. of node = 258.0528392980 deg Inclination = 24.9827790486 deg Eccentricity = 0.3869275577 Semimajor axis = 2.6122220577 AU Perihelion dist = 1.6014813567 AU Mag: H = 8.95, G = 0.15 Epoch of elements : MJD 60328.51460046 TDT (2024 Jan 19.5146) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#742023Feb07,3.75,2024,1,19,12.350448,0.326853,0.378096,5.225884,-4.514256,0.005238,0.001592,0.000000,0.000000 94.7852,20.8898,-2.61,-20.38,False UCAC4 554-004655,2.54022082,20.7827460,12.23,11.91,11.74,0.0,0,,2.56281461,20.8898195,1.41,1.22,0,0,0 132,Aethra,12.97,45.827,1.7055,0,0,1.924,-23.27,,3.0,0 0,316.2110,2024,1,19,255.5705,258.0528,24.9828,0.38693,2.61222,1.60148,8.95,5.0,0.15 1.155,0.0100,0.0029,100,0.0057,Known errors,1.35,0,-1,-1 20240119_004655,60137.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org