869 Mellena

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869 Mellena
Discovery 
Perihelion
2.0966 AU
2.6887 AU
Eccentricity0.2202
4.41 yr (1,610 d)
90.376°
0° 13m 24.96s / day
Inclination7.8385°
154.88°
107.09°
Physical characteristics
Mean diameter
  • 18.45±0.32 km[6]
  • 18.52±0.8 km[7]
  • 21.193±0.090 km[8]
Synodic rotation period
6.5155±0.0005 h[9]
  • 0.0565±0.005[7]
  • 0.057±0.022[8]
  • 0.058±0.002[6]
11.9[1][3]

869 Mellena (

rotation period of 6.5 hours and measures approximately 19 kilometers (12 miles) in diameter. It was named after Werner von Melle (1853–1937), mayor of Hamburg, who founded the discovering observatory.[2]

Orbit and classification

Mellena is a non-

semi-major axis of 2.69 AU). Its orbit has an eccentricity of 0.22 and an inclination of 8° with respect to the ecliptic.[3]

Discovery

Mellena was discovered by German astronomer

Algiers Observatory in Northern Africa on 26 March 1930, almost 13 years after its official discovery observation at Bergedorf.[1]

Naming

This

H 85).[2]

Physical characteristics

In both the Tholen- and SMASS-like taxonomy of the

Small Solar System Objects Spectroscopic Survey (S3OS2) as well as in the SDSS-based taxonomy, Mellena is a common, carbonaceous C-type asteroid.[5][10][11]

Rotation period

In May 2010, a rotational

U=3−).[14] These observations gave a concurring period of (6.510±0.003), (6.510±0.001) and (6.515±0.001) hours with an amplitude of (0.25±0.02), (0.20±0.02) and (0.26±0.03) magnitude, respectively.[12]

Diameter and albedo

According to the surveys carried out by the Japanese

mean diameter measurements published by the WISE team include (15.23±3.47 km), (16.39±3.30 km), (17.77±0.46 km) and (21.953±0.153 km) with corresponding albedos of (0.12±0.17), (0.09±0.04), (0.065±0.009) and (0.0377±0.0020).[5][12]

References

  1. ^ a b c d e f "869 Mellena (A917 JB)". Minor Planet Center. Retrieved 3 March 2020.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c d "JPL Small-Body Database Browser: 869 Mellena (A917 JB)" (2020-01-06 last obs.). Jet Propulsion Laboratory. Retrieved 3 March 2020.
  4. ^ a b "Asteroid 869 Mellena – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 3 March 2020.
  5. ^ a b c d "Asteroid 869 Mellena". Small Bodies Data Ferret. Retrieved 3 March 2020.
  6. ^
    doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153
    )
  7. ^
    Bibcode:2004PDSS...12.....T
    . Retrieved 3 March 2020.
  8. ^
    doi:10.1088/0004-637X/791/2/121
    .
  9. ^
    ISSN 1052-8091
    .
  10. ^
    doi:10.1016/j.icarus.2004.06.006
    . Retrieved 3 March 2020.
  11. ^
    doi:10.1051/0004-6361/200913322. Retrieved 3 March 2020. (PDS data set)
  12. ^ a b c d "LCDB Data for (869) Mellena". Asteroid Lightcurve Database (LCDB). Retrieved 3 March 2020.
  13. ISSN 1052-8091
    .
  14. ISSN 1052-8091
    .

External links
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