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1609 Brenda
Discovery
Discovered by	E. L. Johnson
Discovery site	Johannesburg Obs.
Discovery date	10 July 1951
Designations
MPC designation	(1609) Brenda
Named after	Brenda (discoverer's granddaughter)
Alternative designations	1951 NL · 1925 EA; 1934 JB · 1947 WB; 1950 HD · 1954 EP; 1954 HE
Minor planet category	main-belt · (middle); Gersuind
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	82.98 yr (30,310 days)
Aphelion	3.2255 AU
Perihelion	1.9432 AU
Semi-major axis	2.5844 AU
Eccentricity	0.2481
Orbital period (sidereal)	4.15 yr (1,518 days)
Mean anomaly	309.08°
Mean motion	0° 14m 13.92s / day
Inclination	18.628°
Longitude of ascending node	105.23°
Argument of perihelion	229.14°
Physical characteristics
Dimensions	26.27±6.75 km; 27.96±0.48 km; 29.59 km (derived); 29.64±1.7 km (IRAS:6)
Synodic rotation period	19.46 h; 23±1 h
Geometric albedo	0.1078 (derived); 0.1147±0.014 (IRAS:6); 0.13±0.05; 0.133±0.005
Spectral type	S; B–V = 0.860; U–B = 0.390
Absolute magnitude (H)	10.50 · 10.6 · 10.61 · 10.68

1609 Brenda, provisional designation 1951 NL, is a stony asteroid from the central region of the asteroid belt, approximately 28 kilometers in diameter. It was discovered on 10 July 1951, by South African astronomer Ernest Johnson at the Johannesburg Observatory in South Africa, and named after his granddaughter, Brenda.^[9]

Orbit and classification

The S-type asteroid orbits the Sun in the central main-belt at a distance of 1.9–3.2 AU once every 4 years and 2 months (1,518 days). Its orbit has an eccentricity of 0.25 and an inclination of 19° with respect to the ecliptic.^[1] Brenda was first identified as 1925 EA at Simeiz Observatory in 1925. Its observation arc begins 17 years prior to its official discovery observation, with its identification 1934 JB, also made at Simeiz.^[9]

Physical characteristics

American astronomer Richard Binzel obtained the first rotational lightcurve of Brenda in June 1984. It gave a rotation period of 19.46 hours with a brightness variation of 0.16 magnitude (U=2).^[7] In June 2006, a period of 23±1 with an amplitude of 0.26 magnitude was derived from photometric observations made by French amateur astronomer René Roy (U=2).^[8]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Brenda measures between 26.27 and 29.64 kilometers in diameter, and its surface has an albedo between 0.115 and 0.133.^[4]^[5]^[6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1078 and a diameter of 29.59 kilometers with an absolute magnitude of 10.68.^[3]

Naming

This minor planet was named by the discoverer for his granddaughter, Brenda.^[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3931).^[10] Ernest Johnson is also known for the discovery of the periodic comet 48P/Johnson, using the Franklin-Adams Star Camera.

References

^ ^a ^b ^c ^d ^e ^f "JPL Small-Body Database Browser: 1609 Brenda (1951 NL)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2017.
^ ^a ^b Schmadel, Lutz D. (2007). "(1609) Brenda". Dictionary of Minor Planet Names – (1609) Brenda. Springer Berlin Heidelberg. p. 128. doi:10.1007/978-3-540-29925-7_1610. ISBN 978-3-540-00238-3.
^ ^a ^b ^c ^d ^e ^f "LCDB Data for (1609) Brenda". Asteroid Lightcurve Database (LCDB). Retrieved 29 December 2016.
^ ^a ^b ^c ^d 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.
^ ^a ^b ^c ^d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
^ ^a ^b ^c ^d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
^ ^a ^b ^c Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 29 December 2016.
^ ^a ^b Behrend, Raoul. "Asteroids and comets rotation curves – (1609) Brenda". Geneva Observatory. Retrieved 29 December 2016.
^ ^a ^b "1609 Brenda (1951 NL)". Minor Planet Center. Retrieved 29 December 2016.
^ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.