| 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) |
| 2026-03-26 00:00 |
13:07:39.02 |
-46:15:49.9 |
HIP 63975 |
17.61 |
| 2026-03-26 12:00 |
13:07:37.10 |
-46:15:46.8 |
HIP 63975 |
17.36 |
| 2026-03-27 00:00 |
13:07:35.18 |
-46:15:43.6 |
HIP 63975 |
17.12 |
| 2026-03-27 12:00 |
13:07:33.26 |
-46:15:40.3 |
HIP 63975 |
16.88 |
| 2026-03-28 00:00 |
13:07:31.33 |
-46:15:36.9 |
HIP 63975 |
16.64 |
| 2026-03-28 12:00 |
13:07:29.40 |
-46:15:33.3 |
HIP 63975 |
16.40 |
| 2026-03-29 00:00 |
13:07:27.46 |
-46:15:29.6 |
HIP 63975 |
16.16 |
| 2026-03-29 12:00 |
13:07:25.53 |
-46:15:25.8 |
HIP 63975 |
15.92 |
| 2026-03-30 00:00 |
13:07:23.59 |
-46:15:21.8 |
HIP 63975 |
15.69 |
| 2026-03-30 12:00 |
13:07:21.65 |
-46:15:17.7 |
HIP 63975 |
15.45 |
| 2026-03-31 00:00 |
13:07:19.70 |
-46:15:13.5 |
HIP 63975 |
15.22 |
| 2026-03-31 12:00 |
13:07:17.76 |
-46:15:09.2 |
HIP 63975 |
14.99 |
| 2026-04-01 00:00 |
13:07:15.81 |
-46:15:04.7 |
HIP 63975 |
14.77 |
| 2026-04-01 12:00 |
13:07:13.86 |
-46:15:00.2 |
HIP 63975 |
14.55 |
| 2026-04-02 00:00 |
13:07:11.90 |
-46:14:55.5 |
HIP 63975 |
14.32 |
| 2026-04-02 12:00 |
13:07:09.95 |
-46:14:50.6 |
HIP 63975 |
14.11 |
| 2026-04-03 00:00 |
13:07:07.99 |
-46:14:45.7 |
HIP 63975 |
13.89 |
| 2026-04-03 12:00 |
13:07:06.03 |
-46:14:40.6 |
HIP 63975 |
13.68 |
| 2026-04-04 00:00 |
13:07:04.07 |
-46:14:35.4 |
HIP 63975 |
13.48 |
| 2026-04-04 12:00 |
13:07:02.11 |
-46:14:30.0 |
HIP 63975 |
13.27 |
| 2026-04-05 00:00 |
13:07:00.15 |
-46:14:24.6 |
HIP 63975 |
13.07 |
| 2026-04-05 12:00 |
13:06:58.19 |
-46:14:19.0 |
HIP 63975 |
12.88 |
| 2026-04-06 00:00 |
13:06:56.23 |
-46:14:13.3 |
HIP 63975 |
12.69 |
| 2026-04-06 12:00 |
13:06:54.26 |
-46:14:07.5 |
HIP 63975 |
12.51 |
| 2026-04-07 00:00 |
13:06:52.30 |
-46:14:01.6 |
HIP 63975 |
12.33 |
| 2026-04-07 12:00 |
13:06:50.33 |
-46:13:55.5 |
HIP 63975 |
12.16 |
| 2026-04-08 00:00 |
13:06:48.37 |
-46:13:49.3 |
HIP 63975 |
11.99 |
| 2026-04-08 12:00 |
13:06:46.40 |
-46:13:43.0 |
HIP 63975 |
11.83 |
| 2026-04-09 00:00 |
13:06:44.44 |
-46:13:36.6 |
HIP 63975 |
11.67 |
| 2026-04-09 12:00 |
13:06:42.47 |
-46:13:30.1 |
HIP 63975 |
11.53 |
| 2026-04-10 00:00 |
13:06:40.51 |
-46:13:23.4 |
HIP 63975 |
11.39 |
| 2026-04-10 12:00 |
13:06:38.54 |
-46:13:16.6 |
HIP 63975 |
11.26 |
| 2026-04-11 00:00 |
13:06:36.58 |
-46:13:09.7 |
HIP 63975 |
11.13 |
| 2026-04-11 12:00 |
13:06:34.62 |
-46:13:02.7 |
HIP 63975 |
11.02 |
| 2026-04-12 00:00 |
13:06:32.66 |
-46:12:55.6 |
HIP 63975 |
10.91 |
| 2026-04-12 12:00 |
13:06:30.70 |
-46:12:48.4 |
HIP 63975 |
10.81 |
| 2026-04-13 00:00 |
13:06:28.74 |
-46:12:41.0 |
HIP 63975 |
10.72 |
| 2026-04-13 12:00 |
13:06:26.78 |
-46:12:33.5 |
HIP 63975 |
10.64 |
| 2026-04-14 00:00 |
13:06:24.82 |
-46:12:25.9 |
HIP 63975 |
10.58 |
| 2026-04-14 12:00 |
13:06:22.87 |
-46:12:18.2 |
HIP 63975 |
10.52 |
| 2026-04-15 00:00 |
13:06:20.92 |
-46:12:10.4 |
HIP 63975 |
10.47 |
| 2026-04-15 12:00 |
13:06:18.97 |
-46:12:02.5 |
HIP 63975 |
10.43 |
| 2026-04-16 00:00 |
13:06:17.02 |
-46:11:54.4 |
HIP 63975 |
10.40 |