C/1968 N1 (Honda)
| Parameter |
Value |
| Designation |
C/1968 N1 (Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1968-08-07T22:10:35.492160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
12.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1968-09-04.0000000 |
| e |
1.00071634 |
| q (au) |
1.160438 |
| a (au) |
-1619.950396 |
| i (deg) |
143.238254 |
| Ω (om, deg) |
106.747265 |
| ω (w, deg) |
88.715828 |
| M (ma, deg) |
0.000409 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.762 + 5.761\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.762 |
| n |
5.761 |
| gf |
1.000 |
| gb |
-0.601 |
| k |
0.800 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:10:09.89 |
-46:09:43.6 |
HIP 64214 |
19.43 |
| 2026-02-03 12:00 |
13:10:09.04 |
-46:09:53.2 |
HIP 64214 |
19.54 |
| 2026-02-04 00:00 |
13:10:08.18 |
-46:10:02.7 |
HIP 64214 |
19.66 |
| 2026-02-04 12:00 |
13:10:07.30 |
-46:10:12.1 |
HIP 64214 |
19.77 |
| 2026-02-05 00:00 |
13:10:06.41 |
-46:10:21.4 |
HIP 64214 |
19.89 |
| 2026-02-05 12:00 |
13:10:05.50 |
-46:10:30.6 |
HIP 64214 |
20.00 |
| 2026-02-06 00:00 |
13:10:04.57 |
-46:10:39.7 |
HIP 64214 |
20.12 |
| 2026-02-06 12:00 |
13:10:03.63 |
-46:10:48.7 |
HIP 64214 |
20.23 |
| 2026-02-07 00:00 |
13:10:02.67 |
-46:10:57.5 |
HIP 64214 |
20.34 |
| 2026-02-07 12:00 |
13:10:01.70 |
-46:11:06.3 |
HIP 64214 |
20.46 |
| 2026-02-08 00:00 |
13:10:00.72 |
-46:11:15.0 |
HIP 64214 |
20.57 |
| 2026-02-08 12:00 |
13:09:59.72 |
-46:11:23.6 |
HIP 64214 |
20.68 |
| 2026-02-09 00:00 |
13:09:58.70 |
-46:11:32.0 |
HIP 64214 |
20.79 |
| 2026-02-09 12:00 |
13:09:57.67 |
-46:11:40.4 |
HIP 64214 |
20.90 |
| 2026-02-10 00:00 |
13:09:56.62 |
-46:11:48.6 |
HIP 64214 |
21.01 |
| 2026-02-10 12:00 |
13:09:55.56 |
-46:11:56.7 |
HIP 64214 |
21.12 |
| 2026-02-11 00:00 |
13:09:54.49 |
-46:12:04.8 |
HIP 64214 |
21.23 |
| 2026-02-11 12:00 |
13:09:53.40 |
-46:12:12.7 |
HIP 64214 |
21.34 |
| 2026-02-12 00:00 |
13:09:52.30 |
-46:12:20.5 |
HIP 64214 |
21.45 |
| 2026-02-12 12:00 |
13:09:51.18 |
-46:12:28.2 |
HIP 64214 |
21.56 |
| 2026-02-13 00:00 |
13:09:50.05 |
-46:12:35.7 |
HIP 64214 |
21.67 |
| 2026-02-13 12:00 |
13:09:48.90 |
-46:12:43.2 |
HIP 64214 |
21.78 |
| 2026-02-14 00:00 |
13:09:47.74 |
-46:12:50.5 |
HIP 64214 |
21.89 |
| 2026-02-14 12:00 |
13:09:46.56 |
-46:12:57.7 |
HIP 64214 |
22.00 |
| 2026-02-15 00:00 |
13:09:45.38 |
-46:13:04.9 |
HIP 64214 |
22.11 |
| 2026-02-15 12:00 |
13:09:44.17 |
-46:13:11.8 |
HIP 64214 |
22.22 |
| 2026-02-16 00:00 |
13:09:42.96 |
-46:13:18.7 |
HIP 64214 |
22.33 |
| 2026-02-16 12:00 |
13:09:41.73 |
-46:13:25.5 |
HIP 64214 |
22.43 |
| 2026-02-17 00:00 |
13:09:40.48 |
-46:13:32.1 |
HIP 64214 |
22.54 |
| 2026-02-17 12:00 |
13:09:39.23 |
-46:13:38.6 |
HIP 64214 |
22.65 |
| 2026-02-18 00:00 |
13:09:37.96 |
-46:13:45.0 |
HIP 64214 |
22.76 |
| 2026-02-18 12:00 |
13:09:36.67 |
-46:13:51.3 |
HIP 64214 |
22.87 |
| 2026-02-19 00:00 |
13:09:35.37 |
-46:13:57.5 |
HIP 64214 |
22.98 |
| 2026-02-19 12:00 |
13:09:34.07 |
-46:14:03.5 |
HIP 64214 |
23.09 |
| 2026-02-20 00:00 |
13:09:32.74 |
-46:14:09.4 |
HIP 64214 |
23.20 |
| 2026-02-20 12:00 |
13:09:31.41 |
-46:14:15.2 |
HIP 64214 |
23.31 |
| 2026-02-21 00:00 |
13:09:30.06 |
-46:14:20.9 |
HIP 64214 |
23.42 |
| 2026-02-21 12:00 |
13:09:28.70 |
-46:14:26.4 |
HIP 64214 |
23.53 |
| 2026-02-22 00:00 |
13:09:27.32 |
-46:14:31.8 |
HIP 64214 |
23.65 |
| 2026-02-22 12:00 |
13:09:25.94 |
-46:14:37.1 |
HIP 64214 |
23.76 |
| 2026-02-23 00:00 |
13:09:24.54 |
-46:14:42.3 |
HIP 64214 |
23.87 |
| 2026-02-23 12:00 |
13:09:23.13 |
-46:14:47.3 |
HIP 64214 |
23.98 |
| 2026-02-24 00:00 |
13:09:21.71 |
-46:14:52.2 |
HIP 64214 |
24.09 |