99942 Apophis (2004 MN4)
Data
Name | Apophis |
---|---|
Number | 99942 |
Provisional Designation | 2004 MN4 |
Type | Aten, NEO, PHA |
Diameter | 0.34 km |
Absolute Magnitude, H | 19.7 |
Rotation period | 30.4 h |
Geometric Albedo | 0.23 |
Eccentricity | 0.1912 |
Semi-major axis | 0.9224 au |
Inclination | 3.331 ° |
Discovery Date | 2004-06-19 |
Discovery By | R. A. Tucker, D. J. Tholen and F. Bernardi |
Discovery Means | Kitt Peak |
Radar Experiments
Doppler-Only (Continuous Wave) Echo Power Spectra
Description
Echo power spectrum obtained on 2013-2-21 smoothed to a frequency resolution of 0.1 Hz. Power in the opposite circular (OC) polarization as transmitted is the solid line while the power in the same circular (SC) polarization as transmitted is the dashed line. The polariation ratio on this date was 0.03.
Observation Date: 2013-02-21 (00:36:48-01:13:25)
Resolution: 0.1 Hz
Polarization Ratio: 0.03
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Description
Echo power spectrum obtained on 2013-2-20 smoothed to a frequency resolution of 0.1 Hz. Power in the opposite circular (OC) polarization as transmitted is the solid line while the power in the same circular (SC) polarization as transmitted is the dashed line. The polariation ratio on this date was 0.12.
Observation Date: 2013-02-20 (00:31:11-00:44:43)
Resolution: 0.1 Hz
Polarization Ratio: 0.12
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Description
Observation Date: 2013-02-18 (01:06:16-01:08:49)
Resolution: 0.1 Hz
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Description
Echo power spectrum obtained on 2013-2-17 smoothed to a frequency resolution of 0.05 Hz. Power in the opposite circular (OC) polarization as transmitted is the solid line while the power in the same circular (SC) polarization as transmitted is the dashed line. The polariation ratio on this date was 0.35.
Observation Date: 2013-02-17 (00:46:25-01:04:43)
Resolution: 0.05 Hz
Polarization Ratio: 0.35
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Description
Echo power spectrum obtained on 2013-2-13 smoothed to a frequency resolution of 0.1 Hz. Power in the opposite circular (OC) polarization as transmitted is the solid line while the power in the same circular (SC) polarization as transmitted is the dashed line. The polariation ratio on this date was 0.35.
Observation Date: 2013-02-13 (01:14:32-01:16:51)
Resolution: 0.1 Hz
Polarization Ratio: 0.35
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