3401 Vanphilos
Discovery [1]
Discovered byHarvard College Obs.
Discovery siteOak Ridge Obs.
(Agassiz Stn.)
Discovery date1 August 1981
Designations
(3401) Vanphilos
Named after
Vanessa Hall
Philip Osborne
(friends of G. V. Williams)[2]
1981 PA · 1946 DA
Mars crosser [1][3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc70.38 yr (25,708 days)
Aphelion3.2195 AU
Perihelion1.5147 AU
2.3671 AU
Eccentricity0.3601
3.64 yr (1,330 days)
264.28°
0° 16m 14.16s / day
Inclination21.797°
322.38°
108.64°
Mars MOID0.1190 AU
Physical characteristics
Dimensions7.023±1.045 km[5]
7.10±4.56 km[6]
10.30 km (calculated)[4]
4.225±0.001 h[7]
4.226±0.001 h[8]
4.2261±0.0005 h[lower-alpha 1]
4.227±0.005 h[9]
0.20 (assumed)[4]
0.31±0.15[6]
0.377±0.198[5]
SMASS = S [1] · S [4]
12.29±0.27[10] · 12.3[1][4][5] · 12.65[6]

    3401 Vanphilos, provisional designation 1981 PA, is a stony, eccentric asteroid and sizeable Mars-crosser, approximately 7 kilometers in diameter. It was discovered on 1 August 1981, by and at Harvard's Oak Ridge Observatory (Agassiz Station) in Massachusetts, United States.[3]

    Orbit and classification

    Vanphilos orbits the Sun in the inner main-belt at a distance of 1.5–3.2 AU once every 3 years and 8 months (1,330 days). Its orbit has an eccentricity of 0.36 and an inclination of 22° with respect to the ecliptic.[1] In 1946, it was first identified as 1946 DA at the Finnish Turku Observatory, extending the body's observation arc by 35 years prior to its official discovery at Harvard.[3]

    Physical characteristics

    In the SMASS taxonomy, Vanphilos is characterized as a common S-type asteroid.[1]

    Rotation period

    In February and March 2008, three rotational lightcurves of Vanphilos were obtained from photometric observations by astronomers Petr Pravec, James W. Brinsfield and Robert Stephens. Light-curve analysis gave a well defined rotation period of 4.225 and 4.226 hours, respectively, with a change in brightness between 0.50 and 0.54 magnitude (U=3/3/3).[7][8][lower-alpha 1]

    In August 2014, astronomer Brian Warner derived a concurring period of 4.227 hours with an amplitude of 0.62 magnitude from his observations taken at the Palmer Divide Station in Colorado (U=3).[9] Light-curve plots were published on-line by the Ondřejov Observatory and the Center for Solar System Studies.[lower-alpha 2][lower-alpha 3]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Vanphilos measures 7.02 and 7.10 kilometers in diameter, and its surface has an albedo of 0.377 and 0.31, respectively.[5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.30 kilometers, as the lower the body's albedo (reflectivity), the larger its diameter, at a constant absolute magnitude.[4]

    Naming

    This minor planet was named for Vanessa Hall and Philip Osborne, by astronomer G. V. William to celebrate their marriage on 3 August 1991.[2] The approved naming citation was published by the Minor Planet Center on 25 August 1991 (M.P.C. 18644).[11]

    Notes

    1. 1 2 Pravec (2008) web: rotation period 4.2261±0.0005 hours with a brightness amplitude of 0.51 mag and quality code of 3. Summary figures for (3401) Vanphilos at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2008) at Ondřejov Observatory
    2. ↑ Online published Lightcure plots of (3401) Vanphilos at the Center for Solar System Studies (CS3) in 2014
    3. ↑ Online published lightcure plot of (3401) Vanphilos at Ondřejov Observatory in 2008

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 3401 Vanphilos (1981 PA)" (2016-07-09 last obs.). Jet Propulsion Laboratory. Retrieved 17 June 2017.
    2. 1 2 Schmadel, Lutz D. (2007). "(3401) Vanphilos". Dictionary of Minor Planet Names – (3401) Vanphilos. Springer Berlin Heidelberg. p. 283. doi:10.1007/978-3-540-29925-7_3401. ISBN 978-3-540-00238-3.
    3. 1 2 3 "3401 Vanphilos (1981 PA)". Minor Planet Center. Retrieved 10 January 2017.
    4. 1 2 3 4 5 6 "LCDB Data for (3401) Vanphilos". Asteroid Lightcurve Database (LCDB). Retrieved 10 January 2017.
    5. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381. Retrieved 10 January 2017.
    6. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
    7. 1 2 Brinsfield, James W. (September 2008). "Asteroid Lightcurve Analysis at the Via Capote Observatory: First Quarter 2008". The Minor Planet Bulletin. 35 (3): 119–122. Bibcode:2008MPBu...35..119B. ISSN 1052-8091. Retrieved 10 January 2017.
    8. 1 2 Stephens, Robert D. (September 2008). "Asteroids Observed from GMARS and Santana Observatories - Late 2007 and Early 2008". The Minor Planet Bulletin. 35 (3): 126–128. Bibcode:2008MPBu...35..126S. ISSN 1052-8091. Retrieved 10 January 2017.
    9. 1 2 Warner, Brian D. (January 2015). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June-October". The Minor Planet Bulletin. 42 (1): 54–60. Bibcode:2015MPBu...42...54W. ISSN 1052-8091. PMID 32457970. Retrieved 10 January 2017.
    10. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339. Retrieved 10 January 2017.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 January 2017.
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