IOTA/IOTA-ES occultation update for (551) Ortrud / UCAC4-540-047894 event on 2023 May 12, 09:37 UT Visible from Australia Summary ------- On 2023 May 12 UT, the 81.2 km diameter asteroid (551) Ortrud will occult a 12.5 mag star in the constellation Cancer for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.86 mag to 15.28 mag (the magnitude of the asteroid) for at most 3.560 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: 2023 May 12, 09:32 - 2023 May 12, 09:41 * geocentric midpoint of event [JD]: 2460076.90089463 * magnitude of target star: 12.50 * magnitude drop [mag]: 2.86 * estimated maximum duration [s]: 3.560 * Moon: 53 % sunlit, 171° distance * Sun: 79° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 90 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.001", 106°) * approx speed of asteroid's shadow [km/s]: 22.8351 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-540-047894 by 551 Ortrud on 2023 May 12 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 33 0 0 - 8 54 36 9 33 5.4 0 72 63 - 9 20 17 - 8 29 2 - 9 21 7 - 8 28 12 .... 34 0 0 - 8 35 26 9 33 5.5 1 72 63 - 9 1 4 - 8 9 55 - 9 1 54 - 8 9 5 0.23 35 0 0 - 8 16 39 9 33 5.7 3 72 64 - 8 42 13 - 7 51 10 - 8 43 4 - 7 50 20 0.33 36 0 0 - 7 58 15 9 33 6.0 4 71 64 - 8 23 46 - 7 32 49 - 8 24 36 - 7 31 59 0.37 37 0 0 - 7 40 14 9 33 6.4 5 71 64 - 8 5 43 - 7 14 50 - 8 6 33 - 7 14 1 0.40 38 0 0 - 7 22 36 9 33 6.9 6 71 64 - 7 48 2 - 6 57 16 - 7 48 52 - 6 56 26 0.41 39 0 0 - 7 5 23 9 33 7.5 7 71 65 - 7 30 46 - 6 40 5 - 7 31 36 - 6 39 16 0.42 40 0 0 - 6 48 34 9 33 8.2 8 71 65 - 7 13 55 - 6 23 19 - 7 14 45 - 6 22 29 0.43 41 0 0 - 6 32 10 9 33 9.0 9 71 65 - 6 57 28 - 6 6 57 - 6 58 17 - 6 6 8 0.43 42 0 0 - 6 16 10 9 33 9.9 10 71 65 - 6 41 26 - 5 51 0 - 6 42 15 - 5 50 11 0.44 43 0 0 - 6 0 36 9 33 10.9 11 70 65 - 6 25 49 - 5 35 28 - 6 26 38 - 5 34 39 0.44 44 0 0 - 5 45 27 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0.85 Uncertainty in time = +/- 1 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-540-047894 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 49 54.0849 DE: +17 58 03.659 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 49 54.0847 DE: +17 58 03.660 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (551) Ortrud asteroid class: approx. diameter [km]: 81 approx. diameter ["]: 0.039 distance from Earth [AU]: 2.85000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#65 date of fit: 2023 Apr 24 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): 0.014", 0.001", 105.771° remarks: * orbital elements for (551)Ortrud : Mean anomaly = 61.3447063765 deg Arg. of pericenter = 70.6392628528 deg Long. of node = 5.7125380148 deg Inclination = 0.3947315272 deg Eccentricity = 0.1187286327 Semimajor axis = 2.9679328512 AU Perihelion dist = 2.6155542420 AU Mag: H = 9.71, G = 0.15 Epoch of elements : MJD 60076.40097222 TDT (2023 May 12.4010) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#652023Apr24,3.56,2023,5,12,9.621471,-0.120142,-0.415272,12.379442,-3.587451,0.005333,-0.001489,0.000000,0.000000 118.5764,17.8822,34.77,18.12,False UCAC4-540-047894,8.83169027,17.9676830,0.00,12.50,0.00,0.0,0,K,8.85347883,17.8821842,2.86,0.00,0,0,0 551,Ortrud,15.28,81.2,2.8500,0,0,2.676,-11.07,,4.2,0 0,61.2674,2023,5,12,70.6393,5.7125,0.3947,0.11873,2.96793,2.61555,9.73,5.0,0.15 1.016,0.0143,0.0006,106,0.0006,Known errors,-1.00,-1,-1,-1 20230512_047894,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org