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| Discovery | |
|---|---|
| Discovered by | Minoru Honda Giovanni Bernasconi |
| Discovery date | 3 June 1948 |
| Designations | |
| Alternative designations | 1948g, 1948 IV |
| Orbital characteristics | |
| Epoch | 25 June 1948 (JD 2432727.5) |
| Observation arc | 33 days |
| Number of observations | 17 |
| Perihelion | 0.207 AU |
| Eccentricity | 1.001 |
| Inclination | 23.19° |
| Longitude of ascending node | 203.66° |
| Argument of periapsis | 317.15° |
| Last perihelion | 15 May 1948 |
| TJupiter | 0.523 |
| Earth MOID | 0.078 AU |
| Jupiter MOID | 0.74 AU |
| Physical characteristics | |
| Comet total magnitude (M1) | 8.4 |
| Apparent magnitude | 4 (1948 apparition) |
C/1948 L1 (Honda–Bernasconi) is a non-periodic comet discovered on 3 June 1948. The comet was discovered by Minoru Honda and independently found by Giovanni Bernasconi the next day.
Observational history
The comet was detected with naked eye by Minoru Honda on 3 June 1948 and confirmed its presence by using his 6-inch reflector telescope. He noted the comet had an apparent magntiude of about 4 and a tail more than one degree long. He reobserved the comet the next day. The comet was independently discovered by Giovanni Bernasconi, from Cagno, Italy, on 4 June. One more independent discovery was that of Tosikazu Higasi, who spotted the comet on board a ship on 5 June, while he was returning from observing the solar eclipse of May 9, 1948.
Upon discovery the comet was located in the constellation of Perseus, at a solar elongation of 32°, and had passed perihelion three weeks before and was approaching Earth. Closest approach was on 14 June, at a distance of 0.49 AU. The comet remained a faint naked eye object for about a week. On 10 June, George van Biesbroeck reported its magnitude to be 5.2. The coma was reported to 7–8 arcminutes across and its tail was over two degrees long. On 14 June the magnitude was reported to be 5. The tail on that date was 5 degrees long. The comet faded after than and on 25 June its magnitude was given to be 6.7 as seen from binoculars.
The comet continued to fade with a slow rate until 4 July, when it was 8.7 mag, but after brightness dropped sharply and on 11 August its photographic magnitude was reported to be 16, instead of the predicted 12.4, and on 3 September was 20 instead of 14.4. The latter was the last time the comet was observed.
Scientific results
The spectrum of the comet obtained on 13-14 June from the University of Michingan Observatory showed the presence of diatomic carbon and cyanide lines. The stronger lines were λ3883 and λ4737. The λ5165 was of moderate strength, while λ4216 and λ4382 were weak and of about equal intensity. There was also detected the λ4050 group of CH2 in moderate strength. The spectrum of the tail showed the λλ4010, 4262, and 4557 lines of CO+. The spectrum obtained on 9-10 June by Sonneberg Observatory showed strong diatomic carbon and cyanide lines and weak triatomic carbon and CH lines.
Meteors
The comet has been associated with the weak 55 Arietids meteor shower, which peaks on 27 October. It is possible it was created by meteors ejected from a time the comet's orbit passed closer to Earth.
References
- ^ "C/1948 L1 (Honda-Bernasconi) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 3 January 2025.
- ^ G. W. Kronk (2009). Cometography: A Catalog of Comets. Vol. 4: 1933–1959. Cambridge: Cambridge University Press. pp. 298–301. ISBN 978-0-521-58507-1.
- ^ Merton, G. (1 April 1949). "Reports on the Progress of Astronomy". Monthly Notices of the Royal Astronomical Society. 109 (2): 248–257. doi:10.1093/mnras/109.2.248.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ Miller, Freeman D. (February 1949). "The Spectrum of Comet 1948 g". Publications of the Astronomical Society of the Pacific. 61: 32. doi:10.1086/126115.
- van Biesbroeck, G. (1 January 1948). "Comet Notes: Comet 1948 j (Johnson); Comet 1948 g (Honda-Bernasconi); Comet 1948 d (Pajdusakova-Mrkos)". Popular Astronomy. 56: 447. ISSN 0197-7482.
- Bouška, J. (1958). "The spectra of comets 1948 I, 1948 IV, 1955 e and 1955 f". Bulletin of the Astronomical Institutes of Czechoslovakia. 9: 68.
- D. Šegon; P. Gural; Z. Andreić; I. Skokić; K. Korlević; et al. (2014). "New showers from parent body search across several video meteor databases". WGN, Journal of the International Meteor Organization. 42 (2): 57–64. Bibcode:2014JIMO...42...57S. ISSN 1016-3115.
External links
- C/1948 L1 at the JPL Small-Body Database
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