1319 Disa

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title: "1319 Disa" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["background-asteroids", "discoveries-by-cyril-jackson-(astronomer)", "named-minor-planets", "astronomical-objects-discovered-in-1934"] description: "Main-belt asteroid" topic_path: "general/background-asteroids" source: "https://en.wikipedia.org/wiki/1319_Disa" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Main-belt asteroid ::

::data[format=table title="Infobox planet"]

Field	Value
minorplanet	yes
name	1319 Disa
background	#D6D6D6
discovery_ref
discovered	19 March 1934
discoverer	C. Jackson
discovery_site	Johannesburg Obs.
mpc_name	(1319) Disa
alt_names	1934 FO1929 GE
1970 FMA908 EA
pronounced
named_after	Disa (orchid – flowering plant)
mp_category	main-belt(outer)
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	109.20 yr (39,885 days)
aphelion	3.6026 AU
perihelion	2.3684 AU
semimajor	2.9855 AU
eccentricity	0.2067
period	5.16 yr (1,884 days)
mean_anomaly	41.069°
mean_motion	/ day
inclination	2.8007°
asc_node	256.10°
arg_peri	316.25°
dimensions	km
km
km
km
40.33 km (calculated)
rotation	h
h
h
albedo	0.057 (assumed)

| | spectral_type | PC | | abs_magnitude | (R)10.5010.711.1 | ::

| minorplanet = yes | name = 1319 Disa | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 19 March 1934 | discoverer = C. Jackson | discovery_site = Johannesburg Obs. | mpc_name = (1319) Disa | alt_names = 1934 FO1929 GE 1970 FMA908 EA | pronounced = | named_after = Disa (orchid – flowering plant) | mp_category = main-belt(outer) | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 109.20 yr (39,885 days) | aphelion = 3.6026 AU | perihelion = 2.3684 AU | semimajor = 2.9855 AU | eccentricity = 0.2067 | period = 5.16 yr (1,884 days) | mean_anomaly = 41.069° | mean_motion = / day | inclination = 2.8007° | asc_node = 256.10° | arg_peri = 316.25° | dimensions = km km km km 40.33 km (calculated) | rotation = h h h | albedo = 0.057 (assumed)

| spectral_type = PC | abs_magnitude = (R)10.5010.711.1

1319 Disa, provisional designation , is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 19 March 1934, by English-born, South African astronomer Cyril Jackson at Johannesburg Observatory in South Africa. It is named for the orchid Disa.

Orbit

Disa orbits the Sun in the outer main-belt at a distance of 2.4–3.6 AU once every 5 years and 2 months (1,884 days). Its orbit has an eccentricity of 0.21 and an inclination of 3° with respect to the ecliptic. It was first identified as at Heidelberg Observatory in 1908. The body's observation arc begins in 1929, when it was identified as at the discovering observatory, 6 years prior to its official discovery observation.

Physical characteristics

Rotation period

A rotational lightcurve of Disa was obtained by American astronomer Brian D. Warner at his Palmer Divide Observatory in March 2006, and by French amateur astronomer Pierre Antonini in February 2011, respectively. Analysis of both lightcurves gave a well-defined rotation period of 7.08 hours with a brightness variation of 0.26 and 0.27 magnitude ().

In September 2013, photometric observations in the R-band at the Palomar Transient Factory gave a concurring lightcurve of 7.082 hours and an amplitude of 0.24 magnitude ().

Diameter, albedo and spectral type

According to the surveys carried out by the Japanese Akari satellite, and the 2014-results by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Disa measures 24.00 and 25.65 kilometers in diameter, and its surface has an albedo of 0.116 and 0.097, respectively.

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous C-type asteroids of 0.057 and calculates a diameter of 40.33 kilometers with an absolute magnitude of 10.7. Preliminary results by NEOWISE also characterized the body as a dark and reddish P-type asteroid.

Naming

This minor planet was named after Disa, also known as "African weed-orchid", a large genus of more than a hundred tropical orchids, common in southern Africa. In 1955, this naming citation was also published by Paul Herget in The Names of the Minor Planets (H 120).

Notes

References

References

1. {{OED. disa

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