| Minorplanet: | yes |
| 2608 Seneca | |
| Background: |
|
| Discovery Ref: |   |
| Discovered: | 17 February 1978 |
| Mpc Name: | (2608) Seneca |
| Alt Names: | 1978 DA |
| Named After: | Seneca the Younger |
| Mp Category: | NEOAmor  |
| Orbit Ref: |   |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 1 |
| Observation Arc: | 38.92 yr (14,217 days) |
| Perihelion: | 1.0777 AU |
| Semimajor: | 2.5154 AU |
| Eccentricity: | 0.5716 |
| Period: | 3.99 yr (1,457 days) |
| Mean Motion: | / day |
| Inclination: | 14.682° |
| Asc Node: | 167.37° |
| Arg Peri: | 37.350° |
| Dimensions: | 0.9 km |
| Albedo: | 0.20 0.21 |
| Spectral Type: | Tholen = S S  B–V = 0.826 U–B = 0.454 |
| Abs Magnitude: | 17.5217.5917.73 |
2608 Seneca, provisional designation, is a stony asteroid and sub-kilometer near-Earth object of the Amor group, approximately 0.9 kilometers in diameter. It was discovered on 17 February 1978, by German astronomer Hans-Emil Schuster at ESO's La Silla Observatory in northern Chile, and named after Roman philosopher Seneca.
Seneca orbits the Sun at a distance of 1.1–4.0 AU once every 3 years and 12 months (1,457 days). Its orbit has an eccentricity of 0.57 and an inclination of 15° with respect to the ecliptic.
The body's observation arc begins with its official discovery observation in 1978, as no precoveries were taken, and no prior identifications were made.
Seneca has an Earth minimum orbital intersection distance of 0.1321AU, which corresponds to 51.5 lunar distances. On 22 March 2062, it will pass 0.254AU from the Earth.
In the Tholen taxonomy, Seneca is a stony S-type asteroid.
In March 1978, a photometric observations taken by Degewij and Lebofsky at the Lunar and Planetary Laboratory, Arizona, using a 154-cm reflector, gave a rotational lightcurve with a rotation period of 8 hours and a brightness amplitude of 0.4 (0.5) magnitude .
In addition, radiometric observations by L. and M. Lebofsky with the 71-cm reflector gave a mean-diameter of kilometers and albedo of .
The Minor Planet Center classifies Seneca as an object larger than 1 kilometer ("1+ KM Near-Earth Object"), while Collaborative Asteroid Lightcurve Link derives an albedo of 0.20 and a diameter of 0.9 kilometers based on an absolute magnitude of 17.59. In 1994, astronomer Tom Gehrels published a diameter of 0.9 kilometers with an albedo of 0.21 in his Hazards Due to Comets and Asteroids.
This minor planet was named after Roman philosopher and statesman Lucius Annaeus Seneca (c. 4 BC – AD 65), also known as "Seneca the Younger" or simply "Seneca". The approved naming citation was published by the Minor Planet Center on 8 April 1982 . The lunar crater Seneca was also named in his honor.