| 21. | Photometric observations of this asteroid have produced discrepant estimates of the rotation period.
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| 22. | A recent photometric distance measurement gives an approximate distance of 218 light years.
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| 23. | The observatory also has a 38 cm diameter photometric filters and a spectrograph.
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| 24. | Several rotational light-curves for this asteroid were obtained from photometric observations.
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| 25. | A large number of rotational light-curves were obtained from photometric observations.
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| 26. | Several photometric light-curve observations have been performed.
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| 27. | In 1877 he began making photometric observations of the planets and their atmospheres.
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| 28. | It is a photometric variable with periods of and.
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| 29. | These satellites have similar orbits and photometric properties.
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| 30. | They used photometric methods to obtain new values for the luminosity of the Cepheids.
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