| 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) |
| 2026-05-12 00:00 |
13:04:42.29 |
-46:02:41.7 |
HIP 63711 |
13.72 |
| 2026-05-12 12:00 |
13:04:40.66 |
-46:02:28.9 |
HIP 63711 |
13.42 |
| 2026-05-13 00:00 |
13:04:39.03 |
-46:02:16.0 |
HIP 63711 |
13.13 |
| 2026-05-13 12:00 |
13:04:37.42 |
-46:02:03.1 |
HIP 63711 |
12.85 |
| 2026-05-14 00:00 |
13:04:35.81 |
-46:01:50.1 |
HIP 63711 |
12.57 |
| 2026-05-14 12:00 |
13:04:34.22 |
-46:01:37.0 |
HIP 63711 |
12.29 |
| 2026-05-15 00:00 |
13:04:32.63 |
-46:01:23.8 |
HIP 63711 |
12.02 |
| 2026-05-15 12:00 |
13:04:31.06 |
-46:01:10.6 |
HIP 63711 |
11.76 |
| 2026-05-16 00:00 |
13:04:29.49 |
-46:00:57.4 |
HIP 63711 |
11.50 |
| 2026-05-16 12:00 |
13:04:27.94 |
-46:00:44.0 |
HIP 63711 |
11.25 |
| 2026-05-17 00:00 |
13:04:26.39 |
-46:00:30.7 |
HIP 63711 |
11.00 |
| 2026-05-17 12:00 |
13:04:24.86 |
-46:00:17.2 |
HIP 63711 |
10.77 |
| 2026-05-18 00:00 |
13:04:23.34 |
-46:00:03.7 |
HIP 63711 |
10.54 |
| 2026-05-18 12:00 |
13:04:21.82 |
-45:59:50.2 |
HIP 63711 |
10.32 |
| 2026-05-19 00:00 |
13:04:20.32 |
-45:59:36.6 |
HIP 63711 |
10.11 |
| 2026-05-19 12:00 |
13:04:18.83 |
-45:59:22.9 |
HIP 63711 |
9.91 |
| 2026-05-20 00:00 |
13:04:17.35 |
-45:59:09.2 |
HIP 63711 |
9.72 |
| 2026-05-20 12:00 |
13:04:15.88 |
-45:58:55.4 |
HIP 63711 |
9.54 |
| 2026-05-21 00:00 |
13:04:14.42 |
-45:58:41.6 |
HIP 63711 |
9.37 |
| 2026-05-21 12:00 |
13:04:12.97 |
-45:58:27.8 |
HIP 63711 |
9.22 |
| 2026-05-22 00:00 |
13:04:11.54 |
-45:58:13.9 |
HIP 63711 |
9.07 |
| 2026-05-22 12:00 |
13:04:10.11 |
-45:58:00.0 |
HIP 63711 |
8.94 |
| 2026-05-23 00:00 |
13:04:08.70 |
-45:57:45.9 |
HIP 63711 |
8.82 |
| 2026-05-23 12:00 |
13:04:07.30 |
-45:57:31.9 |
HIP 63711 |
8.72 |
| 2026-05-24 00:00 |
13:04:05.91 |
-45:57:17.8 |
HIP 63711 |
8.62 |
| 2026-05-24 12:00 |
13:04:04.53 |
-45:57:03.7 |
HIP 63711 |
8.55 |
| 2026-05-25 00:00 |
13:04:03.17 |
-45:56:49.5 |
HIP 63711 |
8.49 |
| 2026-05-25 12:00 |
13:04:01.81 |
-45:56:35.3 |
HIP 63711 |
8.44 |
| 2026-05-26 00:00 |
13:04:00.47 |
-45:56:21.1 |
HIP 63711 |
8.41 |
| 2026-05-26 12:00 |
13:03:59.14 |
-45:56:06.8 |
HIP 63711 |
8.39 |
| 2026-05-27 00:00 |
13:03:57.82 |
-45:55:52.5 |
HIP 63711 |
8.39 |
| 2026-05-27 12:00 |
13:03:56.52 |
-45:55:38.2 |
HIP 63711 |
8.40 |
| 2026-05-28 00:00 |
13:03:55.23 |
-45:55:23.8 |
HIP 63711 |
8.43 |
| 2026-05-28 12:00 |
13:03:53.94 |
-45:55:09.4 |
HIP 63711 |
8.47 |
| 2026-05-29 00:00 |
13:03:52.68 |
-45:54:54.9 |
HIP 63711 |
8.53 |
| 2026-05-29 12:00 |
13:03:51.42 |
-45:54:40.4 |
HIP 63711 |
8.60 |
| 2026-05-30 00:00 |
13:03:50.18 |
-45:54:25.9 |
HIP 63711 |
8.68 |
| 2026-05-30 12:00 |
13:03:48.95 |
-45:54:11.4 |
HIP 63711 |
8.77 |
| 2026-05-31 00:00 |
13:03:47.73 |
-45:53:56.8 |
HIP 63711 |
8.88 |
| 2026-05-31 12:00 |
13:03:46.53 |
-45:53:42.2 |
HIP 63711 |
9.00 |
| 2026-06-01 00:00 |
13:03:45.34 |
-45:53:27.6 |
HIP 63711 |
9.13 |
| 2026-06-01 12:00 |
13:03:44.16 |
-45:53:13.0 |
HIP 63711 |
9.27 |
| 2026-06-02 00:00 |
13:03:42.99 |
-45:52:58.3 |
HIP 63711 |
9.42 |