IOTA/IOTA-ES occultation update for (754) Malabar / UCAC4 423-060028 event on 2023 Feb 11, 19:10 UT Visible from SE Australia Summary ------- On 2023 Feb 11 UT, the 89.4 km diameter asteroid (754) Malabar will occult a 12.3 mag star in the constellation Virgo for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.26 mag to 14.38 mag (the magnitude of the asteroid) for at most 9.410 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 11, 19:00 - 2023 Feb 11, 19:21 * geocentric midpoint of event [JD]: 2459987.29904654 * magnitude of target star: 12.27 * magnitude drop [mag]: 2.26 * estimated maximum duration [s]: 9.410 * Moon: 69 % sunlit, 6° distance * Sun: 116° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 98 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.004", 88°) * approx speed of asteroid's shadow [km/s]: 9.4961 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 423-060028 by 754 Malabar on 2023 Feb 11 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 ' " Longitude Longitude Longitude Longitude .. .. .. 31 0 0 .. .. .... .. .. .. ... .. .. ... .. .. ... .. .. -140 26 17 .... -142 15 18 30 0 0 19 20 48.9 4 261 34 -138 53 28 -144 50 10 ... .. .. -146 18 0 .... -147 23 39 29 0 0 19 20 42.9 8 259 32 -145 17 53 -149 15 26 -143 44 28 -150 23 10 0.34 Latitude Latitude Latitude Latitude -148 0 0 28 51 21 19 20 41.9 9 259 32 28 23 42 29 18 54 28 5 29 29 36 55 0.45 -149 0 0 28 36 18 19 20 40.0 10 258 31 28 8 31 29 3 59 27 50 13 29 22 6 0.45 -150 0 0 28 20 19 19 20 37.9 11 258 31 27 52 23 28 48 8 27 33 59 29 6 20 0.45 -151 0 0 28 3 21 19 20 35.7 11 257 30 27 35 16 28 31 19 27 16 46 28 49 37 0.45 -152 0 0 27 45 24 19 20 33.2 12 257 29 27 17 9 28 13 31 26 58 33 28 31 56 0.45 -153 0 0 27 26 26 19 20 30.5 13 256 29 26 58 1 27 54 44 26 39 18 28 13 15 0.45 -154 0 0 27 6 27 19 20 27.5 14 256 28 26 37 51 27 34 55 26 19 1 27 53 33 0.45 -155 0 0 26 45 25 19 20 24.3 15 255 28 26 16 38 27 14 5 25 57 40 27 32 50 0.46 -156 0 0 26 23 19 19 20 20.9 16 255 27 25 54 20 26 52 10 25 35 14 27 11 3 0.46 -157 0 0 26 0 7 19 20 17.3 17 255 27 25 30 55 26 29 10 25 11 41 26 48 11 0.46 -158 0 0 25 35 48 19 20 13.4 18 254 26 25 6 23 26 5 5 24 47 0 26 24 14 0.46 -159 0 0 25 10 20 19 20 9.2 19 254 26 24 40 41 25 39 51 24 21 9 25 59 9 0.46 -160 0 0 24 43 42 19 20 4.8 20 253 25 24 13 49 25 13 27 23 54 7 25 32 55 0.46 -161 0 0 24 15 52 19 20 0.1 21 253 25 23 45 44 24 45 52 23 25 51 25 5 29 0.46 -162 0 0 23 46 49 19 19 55.1 22 253 24 23 16 24 24 17 4 22 56 21 24 36 52 0.46 -163 0 0 23 16 30 19 19 49.8 23 252 23 22 45 48 23 47 2 22 25 34 24 7 0 0.46 -164 0 0 22 44 53 19 19 44.2 24 252 23 22 13 54 23 15 42 21 53 28 23 35 52 0.46 -165 0 0 22 11 57 19 19 38.3 25 252 22 21 40 39 22 43 4 21 20 1 23 3 25 0.47 -166 0 0 21 37 39 19 19 32.1 27 252 22 21 6 2 22 9 5 20 45 12 22 29 38 0.47 -167 0 0 21 1 57 19 19 25.5 28 251 21 20 30 0 21 33 43 20 8 56 21 54 29 0.47 -168 0 0 20 24 49 19 19 18.6 29 251 20 19 52 31 20 56 56 19 31 14 21 17 55 0.47 -169 0 0 19 46 13 19 19 11.3 30 251 20 19 13 33 20 18 41 18 52 1 20 39 54 0.47 -170 0 0 19 6 5 19 19 3.7 31 251 19 18 33 3 19 38 56 18 11 15 20 0 24 0.47 -171 0 0 18 24 24 19 18 55.6 32 251 18 17 50 58 18 57 39 17 28 55 19 19 22 0.47 -172 0 0 17 41 8 19 18 47.2 33 251 18 17 7 16 18 14 46 16 44 56 18 36 45 0.47 -173 0 0 16 56 12 19 18 38.3 35 251 17 16 21 55 17 30 16 15 59 17 17 52 32 0.47 -174 0 0 16 9 35 19 18 29.0 36 251 16 15 34 50 16 44 6 15 11 55 17 6 38 0.47 -175 0 0 15 21 13 19 18 19.3 37 251 16 14 46 0 15 56 12 14 22 46 16 19 2 0.47 -176 0 0 14 31 4 19 18 9.0 38 251 15 13 55 22 15 6 32 13 31 48 15 29 41 0.47 -177 0 0 13 39 5 19 17 58.4 39 251 14 13 2 52 14 15 3 12 38 57 14 38 32 0.47 -178 0 0 12 45 13 19 17 47.2 41 251 14 12 8 28 13 21 42 11 44 12 13 45 31 0.47 -179 0 0 11 49 24 19 17 35.5 42 251 13 11 12 6 12 26 26 10 47 28 12 50 37 0.47 -180 0 0 10 51 37 19 17 23.3 43 252 12 10 13 44 11 29 13 9 48 42 11 53 45 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27.1 1 114 6 -78 22 21 -77 24 27 -78 41 27 -77 5 32 0.64 26 0 0 -77 47 32 19 0 27.1 1 115 6 -78 16 45 -77 18 26 -78 35 59 -76 59 24 0.72 25 0 0 -77 41 26 19 0 27.0 0 116 6 -78 10 52 -77 12 8 -78 30 16 .. .. .. 0.94 24 0 0 -77 35 3 19 0 27.0 0 117 6 -78 4 43 .. .. .. -78 24 15 .. .. .. 2.78 23 0 0 .. .. .... .. .. .. .. .. .. -77 58 16 .. .. .. -78 17 58 .. .. .. .... Uncertainty in time = +/- 4 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: UCAC4 423-060028 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 46 30.5860 DE: -05 32 47.341 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 46 30.5862 DE: -05 32 47.343 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (754) Malabar asteroid class: approx. diameter [km]: 89 approx. diameter ["]: 0.052 distance from Earth [AU]: 2.35620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#115 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): 0.021", 0.004", 88.075° remarks: * orbital elements for (754)Malabar : Mean anomaly = 61.5748440076 deg Arg. of pericenter = 303.0672925836 deg Long. of node = 179.9156566697 deg Inclination = 24.5440891856 deg Eccentricity = 0.0508888640 Semimajor axis = 2.9883552703 AU Perihelion dist = 2.8362812653 AU Mag: H = 9.25, G = 0.15 Epoch of elements : MJD 59986.79909722 TDT (2023 Feb 11.7991) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1152022Nov25,9.41,2023,2,11,19.177117,0.332893,-0.236571,3.102475,4.370678,-0.005087,0.001696,0.000000,0.000000 137.6839,-5.6627,-104.11,-13.92,False UCAC4 423-060028,13.77516277,-5.5464836,0.00,12.27,0.00,0.0,0,,13.79525379,-5.6626812,2.25,0.00,0,0,0 754,Malabar,14.38,89.4,2.3562,0,0,0.776,16.32,,4.6,0 0,61.4224,2023,2,11,303.0673,179.9157,24.5441,0.05089,2.98836,2.83628,9.26,5.0,0.15 1.328,0.0213,0.0043,88,0.0172,Known errors,-1.00,-1,-1,-1 20230211_060028,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org