Asteroids with Satellites Database--Johnston's Archive
(87)
Sylvia, Romulus,
and Remus
compiled by Wm. Robert Johnston
last updated
21 September 2014
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:
main belt asteroid, outer
orbital data, primary (osculating elements)
[JPL]
:
semimajor axis a: |
3.481808398 AU
|
orbital period P: |
6.497039467 yr (= 2373.043665 d)
|
eccentricity e: |
0.091145156
|
perihelion distance q: |
3.16445843 AU
|
aphelion distance Q: |
3.799158367 AU
|
inclination i: |
10.8768036°
|
argument of perihelion ω: |
263.685494°
|
ascending node Ω: |
73.083782°
|
mean anomaly M: |
179.424861°
|
perihelion passage TP: |
2011 Feb 25.2693
|
Epoch: |
2014 May 23
|
data arc: |
1894-2013
(2348 obs.)
|
Earth MOID: |
2.1794 AU
|
Jupiter Tisserand invariant TJ: |
3.094
|
orbital data, Romulus:
binary dynamical type: | L [P07f] |
semimajor axis as: |
1351.35
± 0.01 km
[B14h]
|
separation/primary radius as/rp: | 9.5 [*D] |
separation/Hill radius as/rH: | 0.021 [*D] |
orbital period Ps: |
3.654
± 0.024
d [F12b]
|
eccentricity es: |
0.0069
± 0.0037
[B14h]
|
inclination is: | 1.7° ± 1.0° [M05a] |
ascending node Ωs: | 193.17° ± 1.85° [B14h] |
argument of pericenter ωs: | 175° ± 23° [] |
mean anomaly M: | 167° ± 23° [B14h] |
Epoch: | 2004 Sep 01.0 |
normalized ang. mom. αL: |
0.65
[P07f]
|
orbital data, Remus:
binary dynamical type: | L [M09a] |
semimajor axis as: |
701.64
± 0.02 km
[B14h]
|
separation/primary radius as/rp: | 4.9 [*D] |
separation/Hill radius as/rH: | 0.011 [*D] |
orbital period Ps: |
1.373
± 0.01
d [F12b]
|
eccentricity es: |
0.093
± 0.021
[B14h]
|
inclination is: | 2.0° ± 1.0° [M05a] |
ascending node Ωs: | 194.28° ± 6.27° [B14h] |
argument of pericenter ωs: | 135° ± 9° [] |
mean anomaly M: | -79° ± 9° [B14h] |
Epoch: | 2004 Sep 01.0 |
normalized ang. mom. αL: |
0.65
[M09a]
|
|
other data, system (combined):
absolute mag. H: |
6.94
[MPC]
|
slope parameter G: |
(0.15) [*A]
|
effective diameter dE: |
286
± 11
km [M05a]
|
geometric albedo: |
0.036
± 0.008
[M11b]
|
color index U-B: |
0.251
[T95a]
|
color index B-V: |
0.71
[JPL]
|
taxonomic type: |
X (SMASSII) [JPL]
P (Tholen) [JPL]
|
mass m: |
1.48x1019
± 6x1016
kg [B14h]
|
density ρ: |
1.2
± 0.1
g/cm3[M05a]
|
Hill radius rH: |
64000 km [*D]
|
other data, primary:
diameter dp: |
286
± 11
km [M05a]
|
dimensions : | 384 x 264 x 232km [] |
axial ratios a/b, b/c: | 1.46, 1.14 [M05a] |
rotation period RPp: |
5.183640
± 0.000005
h [D95a]
|
amplitude in mag., rotational ΔM: |
?
|
pole direction Β, λ: |
86 ± 6°
,
45 ± 10°
[D95a]
|
other data, Romulus:
diameter ds: |
10.8
± 5.6
km [F12b]
|
axial ratios a/b, b/c: | 2.7;? [B14i] |
diameter ratio ds/dp: |
0.038
± 0.02
[*D]
|
component mag. difference ΔM: |
6.24
± 0.20
[I7590]
|
rotation period RPs: |
?
|
|
other data, Remus:
diameter ds: |
10.6
± 1.6
km [F12b]
|
diameter ratio ds/dp: |
0.037
± 0.006
[*D]
|
component mag. difference ΔM: |
7.2
[*D]
|
rotation period RPs: |
?
|
|
|
--
(87) Sylvia, Romulus, and Remus
--discovery and notes:
Primary discovered
1866 May 16
from
Madras, India
by
N. R. Pogson.
Alternate designation(s):
A909 GA.
Permanent number assigned 1866 May 28.
Named 1866 May 28 for the Roman mythological character and/or Sylvie Petiaux-Hugo Flammarion.
Second component discovered
2001 Feb 18
by M. E. Brown and J. L. Margot
using
adaptive optics telescope
observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA.
Announced
2001 Feb 23 [B01a].
Provisional designation S/2001 (87) 1.
Permanent designation I Romulus, assigned 2005 Aug 11; named for the Roman mythological character [M05h].
Third component discovered
2004 Aug 09
by F. Marchis, P. Descamps, D. Hestroffer, and J. Berthier
using
adaptive optics telescope
observations from Very Large Telescope, ESO, Cerro Paranal, Chile.
Announced
2005 Aug 11 [M05a].
Provisional designation S/2004 (87) 1.
Permanent designation II Remus, assigned 2005 Aug 11; named for the Roman mythological character [M05h].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Marchis, F., Ruffio, J., Vachier, F., & Berthier, J. 2013, AGU Fall Meeting Abstracts Component-resolved near-infrared spectra of multiple asteroid systems
- Beauvalet, L., Marchis, F., & Ruffio, J. 2013, AGU Fall Meeting Abstracts Constraining the inner structure of asteroids in multiple systems
- Noll, Keith S., Ryan, E. L., Grundy, W. M., & Benecchi, S. D. 2013, AAS/Division for Planetary Sciences Meeting Abstracts Ultra-Slow Rotating Outer Main Belt and Trojan Asteroids: Search for Binaries
- Marchis, Franck, Berthier, J., Vachier, F., Durech, J., Descamps, P., & Carry, B. 2013, AAS/Division for Planetary Sciences Meeting Abstracts New insights on the main-belt triple asteroid (87) Sylvia
- Berthier, J., Frappa, E., Klotz, A., Lecacheux, J., Descamps, P., Vachier, F., Marchis, F., Bendjoya, P., Abe, L., Suarez, O., Tanga, P., Devogele, M., Dubreuil, P., & Preston, S. 2013, Central Bureau Electronic Telegrams Detection of a Stellar Occultation by (87) Sylvia I (Romulus)
- Boldrin, Luiz Augusto, Winter, O. C., & Vieira Neto, E. 2012, AAS/Division for Planetary Sciences Meeting Abstracts On The Attitude Dynamics Of Central Bodies Of Triples Systems 87 Sylvia, 45 Eugenia And 2001sn263.
- Vereshchagina, I., Sokov, E., Gorshanov, D., Devyatkin, A., Romas, E., L'vov, V., Slesarenko, V., Rastegaev, D., Balega, Yu., Maximov, A., Diachenko, V., Malogolovec, E., Kouprianov, V., & Naiden, Ya. 2012, European Planetary Science Congress 2012 Investigation of binary asteroids and NEOs
- Fang, Julia, Margot, Jean-Luc, & Rojo, Patricio 2012, The Astronomical Journal Orbits, Masses, and Evolution of Main Belt Triple (87) Sylvia
- Frouard, Julien & Compère, Audrey 2012, Icarus Instability zones for satellites of asteroids: The example of the (87) Sylvia system
- Vereshagina, I. A., Devyatkin, A. V., Gorshanov, D. L., & Sokov, Ye. N. 2012, Fifty years of Cosmic Era: Real and Virtual Studies of the Sky. Conference of Young Scientists of CIS Countries Photometric research of binary and triple asteroids with the use automatic telescopes of Pulkovo Observatory
- Marchis, F., Emery, J. P., Enriquez, J. E., Descamps, P., Berthier, J., Vachier, F., & Durech, J. 2011, AGU Fall Meeting Abstracts Detailed Pictures of Multiple Asteroid Systems in the Main-Belt
- Frouard, J. & Compère, A. 2011, EPSC-DPS Joint Meeting 2011 Mean-motion and secular resonances in the triple asteroidal system 87 Sylvia
- Vereshchagina, I. A. 2011, ArXiv e-prints Investigation of multiple asteroids 2006 VV2, (45) Eugenia, (90) Antiope, (762) Pulcova, (87) Sylvia, 137170 (1999 HF1)
- Marchis, Franck, Berthier, J., Burns, K. J., Descamps, P., Durech, J., Emery, J. P., Enriquez, J. E., Lainey, V., Reiss, A. E., & Vachier, F. 2010, Bulletin of the American Astronomical Society Characteristics of Known Triple Asteroid Systems in the Main Belt
- Cabo Winter, Othon, Boldrin, L. G., Vieira Neto, E., & Gomes, R. 2010, Bulletin of the American Astronomical Society The Contribution Of The Oblateness Of An Asteroid On The Orbital Evolution Of Its Satellites
- Vokrouhlický, David, Nesvorný, David, Bottke, William F., & Morbidelli, Alessandro 2010, The Astronomical Journal Collisionally Born Family About 87 Sylvia
- Sharma, Ishan 2010, Icarus Equilibrium shapes of rubble-pile binaries: The Darwin ellipsoids for gravitationally held granular aggregates
- Vereshchagina, I. A., Gorshanov, D. L., Devyatkin, A. V., & Papushev, P. G. 2009, Solar System Research Some specific features of light curves of (39) Laetitia, (87) Sylvia, (90) Antiopa, and 2006 VV2 asteroids
- Marchis, F., Macomber, B., Berthier, J., Vachier, F., & Emery, J. P. 2009, International Astronomical Union Circular S/2009 (93) 1 and S/2009 (93) 2
- Winter, O. C., Boldrin, L. A. G., Vieira Neto, E., Vieira Martins, R., Giuliatti Winter, S. M., Gomes, R. S., Marchis, F., & Descamps, P. 2009, Monthly Notices of the Royal Astronomical Society On the stability of the satellites of asteroid 87 Sylvia
- Lin, Chi-Long, Zhang, Zhi-Wei, Chen, W. P., King, Sun-Kun, Lin, Hung-Chin, Wang, J.-H., Mondal, S., Alcock, C., Axelrod, T., Bianco, F. B., Byun, Y.-I., Coehlo, N. K., Cook, K. H., Dave, R., de Pater, I., Descamps, P., Lehner, M. J., Kim, D.-W., Lee, T., Lissauer, J. J., Marshall, S. L., Porrata, R., Protopapas, P., Rice, J. A., Schwamb, M. E., Wang, S.-Y., & Wen, C.-Y. 2009, Publications of the Astronomical Society of the Pacific A Close Binary Star Resolved from Occultation by 87 Sylvia
- Storrs, Alex, Davis, M., Richmond, M., & Makhoul, K. 2009, Bulletin of the American Astronomical Society Images of Asteroidal Companions from the Hubble Space Telescope
- Drummond, Jack & Christou, Julian 2008, Icarus Triaxial ellipsoid dimensions and rotational poles of seven asteroids from Lick Observatory adaptive optics images, and of Ceres
- Marchis, F., Descamps, P., Berthier, J., & Emery, J. P. 2008, International Astronomical Union Circular S/2008 (216) 1 and S/2008 (216) 2
- Marchis, Franck, Descamps, P., Berthier, J., Hestroffer, D., Vachier, F., & Baek, M. 2007, Bulletin of the American Astronomical Society Mutual Orbits, Bulk Densities, Formation and Evolution of Multiple Visualized Main-Belt Asteroids
- Drummond, Jack D. & Christou, J. 2006, Bulletin of the American Astronomical Society Sizing up Asteroids at Lick Observatory with Adaptive Optics
- Noll, K. S. 2006, AGU Fall Meeting Abstracts Observational Constraints on n>2 Multiples in the Kuiper Belt
- Marchis, F., Kaasalainen, M., Hom, E. F. Y., Berthier, J., Enriquez, J., Hestroffer, D., Le Mignant, D., & de Pater, I. 2006, Icarus Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey
- Hestroffer, Daniel, Tanga, P., Cellino, A., Kaasalainen, M., Torppa, J., Marchis, F., Richardson, D. C., Elankumaran, P., Berthier, J., Colas, F., & Lounis, S. 2006, Bulletin of the American Astronomical Society HST/FGS High Angular Resolution Observations of Binary Asteroids
- Aslan, Z., Gumerov, R. I., Hudkova, L. A., Ivantsov, A. V., Khamitov, I., & Pinigin, G. I. 2006, IAU Joint Discussion Preliminary Results in Asteroid Mass Determination
- Marchis, Franck, Berthier, Jerome, Descamps, Pascal, & Hestroffer, Daniel 2006, NOAO Proposal Refining the Orbits of Known Main-Belt Binary Asteroids
- 2006, European Southern Observatory Press Release ESO PR Highlights in 2005
- 2005, The Messenger A Triple Asteroid System
- Proust, Dominique 2005, Bulletin de l'Association Francaise d'Observateurs d'Etoiles Variables Nouvelles de l'astronomie
- Savov, E. P. 2005, ArXiv Physics e-prints Orbital Data Confirms Dynamic Fractal Firework Universe Having 3D-spiral Code
- Marchis, Franck, Descamps, Pascal, Hestroffer, Daniel, & Berthier, Jérome 2005, Nature Discovery of the triple asteroidal system 87 Sylvia
- Marchis, F., Descamps, P., Hestroffer, D., Berthier, J., Brown, M. E., & Margot, J.-L. 2005, International Astronomical Union Circular Satellites of (87) Sylvia
- 2005, European Southern Observatory Press Release Rubble-Pile Minor Planet Sylvia and Her Twins
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System 87 Sylvia CCD Spectrum
- Hestroffer, D. J. G. J. 2004, Bulletin of the American Astronomical Society On Equilibrium Shapes among Binary Asteroids
- Storrs, A., Makhoul, K., Wells, E., Gaffey, M., Vilas, F., Landis, R., Wood, C., & Zellner, B. 2002, Bulletin of the American Astronomical Society Imaging Asteroidal Companions with the Hubble Space Telescope (HST)
- Margot, J. L. & Brown, M. E. 2001, Bulletin of the American Astronomical Society Discovery and characterization of binary asteroids 22 Kalliope and 87 Sylvia
- Consolmagno, G. J. & Britt, D. T. 2001, Bulletin of the American Astronomical Society Classifying Asteroids by Macroporosity
- Storrs, A., Vilas, F., Landis, R., Wells, E., Woods, C., Zellner, B., & Gaffey, M. 2001, International Astronomical Union Circular S/2001 (87) 1
- Brown, M. E., Margot, J. L., Keck, W. M., II, de Pater, I., & Roe, H. 2001, International Astronomical Union Circular S/2001 (87) 1
- Prokof'eva, V. V., Demchik, M. I., Karachkina, L. G., & Gaftonyukm, N. M. 1999, Solar System Research Photometric Observations of the Asteroid 87 Sylvia in 1989 and 1992-1993 at the Crimean Astrophysical Observatory and Their Fourier Analysis
- Karachkina, L. G., Prokof'eva, V. V., & Gaftonyuk, N. M. 1999, Solar System Research On the Forced Precession of Asteroid 87 Sylvia
- Prokof'eva, V. V., Demchik, M. L., & Karachkina, L. G. 1995, Astronomical and Astrophysical Transactions Photometric Evidences for the Binary Asteroids 87 Sylvia and 423 Diotima
- Prokof'eva, V. V. & Demchik, M. I. 1994, Astronomy Letters Fourier analysis of simultaneous BVR observations of the asteroid 87 Sylvia and its duplicity
- Prokof'eva, V. V., Demchik, M. I., Karachkina, L. G., & Pavlenko, E. P. 1992, Astronomicheskii Vestnik Asteroid photometry and colorimetry using a digital TV system
- Prokof'eva, V. V. & Demchik, M. I. 1992, Astronomicheskij Tsirkulyar Asteroid 87 Sylvia is binary.
- Blanco, C., di Martino, M., Gonano, M., Jaumann, R., & Mottola, S. 1989, Memorie della Societa Astronomica Italiana CCD observations of minor planets
- Hamilton Brown, R. & Morrison, D. 1984, Icarus Diameters and albedos of thirty-six asteroids
- Milani, A. & Nobili, A. M. 1983, Asteroids, Comets, and Meteors Dynamical instabilities in the outer asteroidal belt
- Schober, H. J. & Surdej, J. 1979, Astronomy and Astrophysics Supplement Series UBV photometry of the asteroids 9 Metis, 87 Sylvia and 247 Eukrate during their oppositions in 1978 with respect to lightcurves
- McDonald, Sophia L. & Steel, Thomas B., Jr. 1952, The Astronomical Journal Representations of observations of thirty-four minor planets belonging to a group which includes the group one-half.
- Hiltner, W. A. 1948, The Astronomical Journal The light curves of two Wolf-Rayet stars in Cepheus.
- Oltramare 1888, Bulletin Astronomique, Serie I Mémoires et Observations. Éphéméride de la planète Sylvia 87, pour l'opposition de 1888
- Ventosa, V. 1881, Astronomische Nachrichten Observations de la petite planète (87) Sylvia
- Peters, C. F. W. 1868, Astronomische Nachrichten Bahnbestimmung des Planeten (87) Sylvia. Von Dr. C. F. W. Peters
- Peters, Karl Friedrich Wilhelm 1868, Gottingen, Druck der Deiterichschen univ.-buchdruckerei W. F. Kaestner, 1868. Bahnbestimmung der (87) Sylvia ...
- Peters, C. F. W. 1867, Astronomische Nachrichten Elemente der Sylvia (87), von C. F. W. Peters
- Pogson, M. 1866, Astronomische Nachrichten Entdeckung eines Planeten (87) Sylvia durch M. Pogson
- Pogson, Norman 1866, Monthly Notices of the Royal Astronomical Society Minor Planet 87 Sylvia
©
2001-2007, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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