IOTA/IOTA-ES occultation update for (414) Liriope / UCAC4 363-106521 event on 2023 Feb 27, 19:05 UT Visible from Australia Summary ------- On 2023 Feb 27 UT, the 78.9 km diameter asteroid (414) Liriope will occult a 12.0 mag star in the constellation Ophiuchus 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 4.30 mag to 16.30 mag (the magnitude of the asteroid) for at most 3.400 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: 2023 Feb 27, 19:00 - 2023 Feb 27, 19:10 * geocentric midpoint of event [JD]: 2460003.29554175 * magnitude of target star: 12.02 * magnitude drop [mag]: 4.30 * estimated maximum duration [s]: 3.400 * Moon: 54 % sunlit, 165° distance * Sun: 73° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 107°) * approx speed of asteroid's shadow [km/s]: 23.2188 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 363-106521 by 414 Liriope on 2023 Feb 27 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 91 0 0 - 6 16 8 19 1 1.8 0 108 -71 - 6 38 46 .. .. .. - 6 46 2 .. .. .. .... 92 0 0 - 6 35 10 19 1 1.9 1 107 -70 - 6 57 48 - 6 12 33 - 7 5 4 - 6 5 18 0.17 93 0 0 - 6 54 13 19 1 2.0 2 107 -69 - 7 16 51 - 6 31 36 - 7 24 7 - 6 24 21 0.14 94 0 0 - 7 13 15 19 1 2.3 3 107 -68 - 7 35 53 - 6 50 38 - 7 43 9 - 6 43 23 0.14 95 0 0 - 7 32 16 19 1 2.6 4 107 -67 - 7 54 54 - 7 9 39 - 8 2 10 - 7 2 24 0.13 96 0 0 - 7 51 17 19 1 3.0 5 107 -66 - 8 13 55 - 7 28 40 - 8 21 10 - 7 21 25 0.13 97 0 0 - 8 10 15 19 1 3.5 6 107 -65 - 8 32 53 - 7 47 39 - 8 40 9 - 7 40 24 0.13 98 0 0 - 8 29 12 19 1 4.1 7 107 -64 - 8 51 50 - 8 6 36 - 8 59 6 - 7 59 21 0.13 99 0 0 - 8 48 7 19 1 4.8 8 107 -63 - 9 10 45 - 8 25 31 - 9 18 0 - 8 18 16 0.13 100 0 0 - 9 6 59 19 1 5.6 9 106 -62 - 9 29 36 - 8 44 23 - 9 36 52 - 8 37 8 0.13 101 0 0 - 9 25 48 19 1 6.4 10 106 -61 - 9 48 25 - 9 3 12 - 9 55 40 - 8 55 57 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in time = +/- 1 secs Prediction of 2022 Dec 30.1 Data for the target star ------------------------ * name: UCAC4 363-106521 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 40 50.3588 DE: -17 27 58.461 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 40 50.3588 DE: -17 27 58.461 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (414) Liriope asteroid class: approx. diameter [km]: 79 approx. diameter ["]: 0.028 distance from Earth [AU]: 3.92710 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 date of fit: 2022 Nov 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): 0.011", 0.003", 106.645° remarks: * orbital elements for (414)Liriope : Mean anomaly = 181.6563554535 deg Arg. of pericenter = 318.3613660431 deg Long. of node = 110.5453634435 deg Inclination = 9.5573669125 deg Eccentricity = 0.0737241783 Semimajor axis = 3.5054489592 AU Perihelion dist = 3.2470126151 AU Mag: H = 9.62, G = 0.15 Epoch of elements : MJD 60002.79562500 TDT (2023 Feb 27.7956) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612022Nov25,3.40,2023,2,27,19.093002,0.000261,-0.115341,13.105310,-0.023853,-0.005771,0.000354,0.000000,0.000000 -178.2076,-17.4792,-103.22,-8.22,False UCAC4 363-106521,17.68065520,-17.4662392,0.00,12.02,0.00,0.0,0,,17.70282758,-17.4791766,4.30,0.00,0,0,0 414,Liriope,16.30,78.9,3.9271,0,0,2.052,-0.05,,4.0,0 0,181.5369,2023,2,27,318.3614,110.5454,9.5574,0.07372,3.50545,3.24701,9.63,5.0,0.15 1.160,0.0110,0.0033,107,0.0044,Known errors,-1.00,-1,-1,-1 20230227_106521,59943.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 30, 01:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org