Report of the 70th National Conference on Weights and Measures 1985

Tholen, Albert D; Barbrow, Louis E; Heffernan, Ann P

doi:10.6028/nbs.sp.704

Cited by 8 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The colors of 1999 YC are consistent with C-type asteroids within the uncertainties, and 2005 UD in this work is also similar to the flattened reflectance spectra as seen in C-type asteroids. The colors of 3200 Phaethon measured here agree with numerous independent studies that spectrally classified it as a B-(or F-)type asteroid (Tholen 1985;Luu & Jewitt 1990;Skiff et al 1996;Lazzarin et al 1996;Hicks 1998;Dundon 2005;Licandro et al 2007).…”

Section: Observational Resultssupporting

confidence: 88%

Observations of 1999 Yc and the Breakup of the Geminid Stream Parent

Kasuga

Jewitt

2008

The Astronomical Journal

View full text Add to dashboard Cite

The Apollo asteroid 1999 YC may share a dynamical association with the Phaethon-Geminid Stream Complex (PGC) (Ohtsuka et al. 2008). Here, we present photometric observations taken to determine the physical properties of 1999 YC. The object shows a nearly neutral reflection spectrum, similar to but slightly redder than the related objects 3200 Phaethon and 2005 UD. Assuming an albedo equal to that of 3200 Phaethon, we find that the diameter is 1.4 ± 0.1 km. Time-resolved broadband photometry yields a double-peaked rotational period of 4.4950 ± 0.0010 h, while the range of the light curve indicates an elongated shape having a projected axis ratio of ∼1.9. Surface brightness models provide no evidence of lasting mass loss of the kind seen in active short-period cometary nuclei. An upper limit to the mass loss is set at ∼10 −3 kg s −1 , corresponding to an upper limit on the fraction of the surface that could be sublimating water ice of <10 −3 . If sustained over the 1000 yr age of the Geminid stream, the total mass loss from 1999 YC (3 × 10 7 kg) would be small compared to the reported stream mass (∼10 12 -10 13 kg), suggesting that the stream is the product of catastrophic, rather than steady-state, breakup of the parent object.

show abstract

Section: Observational Resultssupporting

confidence: 88%

Observations of 1999 Yc and the Breakup of the Geminid Stream Parent

Kasuga

Jewitt

2008

The Astronomical Journal

View full text Add to dashboard Cite

show abstract

“…We find that 1021 Flammario has a smaller inversion angle than is typical for asteroids. At the same time, our observations of the nearEarth asteroid 3200 Phaethon, classified as F-type by Tholen (1985), definitely exclude a small inversion angle for it (see Fig. 6).…”

Section: Low Albedo Asteroidssupporting

confidence: 63%

Polarimetric survey of asteroids with the Asiago telescope

Fornasier¹,

Belskaya²,

Shkuratov³

et al. 2006

A&A

View full text Add to dashboard Cite

Aims. We present the first results of an asteroid photo-polarimetry program started at Asiago-Cima Ekar Observatory. The aim of our survey is to estimate diversity in polarimetric properties of asteroids belonging to different taxonomic and dynamical classes. Methods. The data were obtained with the polarization analyser placed inside the Faint Object Spectrographic Camera (AFOSC) of the 1.8 m telescope. This instrument allows simultaneous measurements of the two first Stokes parameters without any λ/2 retarding plate. Results. Our survey began in 2002, and up to now we have obtained data on a sample of 36 asteroids; most of them are being investigated with the polarimetric technique for the first time. Combining our data with those already available in literature, we present an estimate of the inversion angle for 7 asteroids in this paper. Furthermore, we present the polarimetric measurements of the rare asteroid classes belonging to the A and D types and a detailed VRI observations at extremely small phase angles of the low albedo asteroid 1021 Flammario

show abstract

“…The colors of 3200 Phaethon are also bluer than the Sun (Luu & Jewitt 1990;Skiff et al 1996;Lazzarin et al 1996;Hicks et al 1998;Dundon 2005), and this object has been classified as an F-type asteroid by Tholen (1985) and a B-type asteroid by Green et al (1985), both considered to be blue spectral types. (We discount a single, unconfirmed report that Phaethon is a red S-type object [Cochran & Barker 1984].)…”

Section: Observational Resultsmentioning

confidence: 94%

Physical Observations of 2005 UD: A Mini-Phaethon

Jewitt

Hsieh

2006

Astron J

View full text Add to dashboard Cite

Planet-crossing object 2005 UD is dynamically similar to purported Geminid meteor-stream parent 3200 Phaethon, suggesting an association between the two. We present new physical observations taken to characterize 2005 UD when at 1.6 AU from the Sun. Assuming equal albedos, 2005 UD is about 4 times smaller than 3200 Phaethon, with a diameter of $1:3 AE 0:1 km. The body shows periodic brightness variations of 0.4 mag that are compatible with an aspherical nucleus in rotation with a period near 5.2 hr. At optical wavelengths, 2005 UD is similar to or slightly bluer than the Sun. This property is relatively uncommon among near-Earth objects but is shared by Phaethon, strengthening the association between the two. No evidence for ongoing mass loss at rates as small as 0.01 kg s À1 is found in the surface brightness profile, and we conclude that the fraction of the surface that is losing mass is not greater than 10 À4. Overall, we conclude that the dynamical similarities between 2005 UD and 3200 Phaethon are matched by physical similarities between these bodies, except that the former contains only about 2% of the mass of the latter. Phaethon, 2005 UD, and the Geminid meteoroids may be fragments produced by the breakup of a precursor object.

show abstract

Report of the 70th National Conference on Weights and Measures 1985

Cited by 8 publications

References 0 publications

Observations of 1999 Yc and the Breakup of the Geminid Stream Parent

Observations of 1999 Yc and the Breakup of the Geminid Stream Parent

Polarimetric survey of asteroids with the Asiago telescope

Physical Observations of 2005 UD: A Mini-Phaethon

Contact Info

Product

Resources

About