| Parameter |
Value |
| Designation |
C/1964 L1 (Tomita-Gerber-Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1964-06-30T14:54:46.272960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:16Z |
| Obs used |
16 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1964-08-21.0000000 |
| e |
0.99593167 |
| q (au) |
0.500361 |
| a (au) |
122.989291 |
| i (deg) |
161.832267 |
| Ω (om, deg) |
309.870417 |
| ω (w, deg) |
58.423923 |
| M (ma, deg) |
0.037127 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.557 + 5.901\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.557 |
| n |
5.901 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
05:19:12.57 |
+09:12:30.5 |
HIP 24802 |
3.89 |
| 2026-05-12 12:00 |
05:19:13.82 |
+09:12:34.4 |
HIP 24802 |
4.14 |
| 2026-05-13 00:00 |
05:19:15.08 |
+09:12:38.2 |
HIP 24802 |
4.40 |
| 2026-05-13 12:00 |
05:19:16.34 |
+09:12:42.0 |
HIP 24802 |
4.67 |
| 2026-05-14 00:00 |
05:19:17.61 |
+09:12:45.7 |
HIP 24802 |
4.94 |
| 2026-05-14 12:00 |
05:19:18.88 |
+09:12:49.4 |
HIP 24802 |
5.22 |
| 2026-05-15 00:00 |
05:19:20.16 |
+09:12:53.1 |
HIP 24802 |
5.50 |
| 2026-05-15 12:00 |
05:19:21.45 |
+09:12:56.7 |
HIP 24802 |
5.79 |
| 2026-05-16 00:00 |
05:19:22.74 |
+09:13:00.3 |
HIP 24802 |
6.08 |
| 2026-05-16 12:00 |
05:19:24.04 |
+09:13:03.9 |
HIP 24802 |
6.38 |
| 2026-05-17 00:00 |
05:19:25.34 |
+09:13:07.4 |
HIP 24802 |
6.68 |
| 2026-05-17 12:00 |
05:19:26.64 |
+09:13:10.9 |
HIP 24802 |
6.98 |
| 2026-05-18 00:00 |
05:19:27.96 |
+09:13:14.3 |
HIP 24802 |
7.29 |
| 2026-05-18 12:00 |
05:19:29.27 |
+09:13:17.8 |
HIP 24802 |
7.60 |
| 2026-05-19 00:00 |
05:19:30.60 |
+09:13:21.1 |
HIP 24802 |
7.91 |
| 2026-05-19 12:00 |
05:19:31.92 |
+09:13:24.5 |
HIP 24802 |
8.22 |
| 2026-05-20 00:00 |
05:19:33.25 |
+09:13:27.8 |
HIP 24802 |
8.54 |
| 2026-05-20 12:00 |
05:19:34.59 |
+09:13:31.1 |
HIP 24802 |
8.86 |
| 2026-05-21 00:00 |
05:19:35.93 |
+09:13:34.3 |
HIP 24802 |
9.17 |
| 2026-05-21 12:00 |
05:19:37.27 |
+09:13:37.5 |
HIP 24802 |
9.50 |
| 2026-05-22 00:00 |
05:19:38.62 |
+09:13:40.7 |
HIP 24802 |
9.82 |
| 2026-05-22 12:00 |
05:19:39.97 |
+09:13:43.8 |
HIP 24802 |
10.14 |
| 2026-05-23 00:00 |
05:19:41.33 |
+09:13:46.9 |
HIP 24802 |
10.47 |
| 2026-05-23 12:00 |
05:19:42.69 |
+09:13:49.9 |
HIP 24802 |
10.80 |
| 2026-05-24 00:00 |
05:19:44.05 |
+09:13:52.9 |
HIP 24802 |
11.12 |
| 2026-05-24 12:00 |
05:19:45.42 |
+09:13:55.9 |
HIP 24802 |
11.45 |
| 2026-05-25 00:00 |
05:19:46.79 |
+09:13:58.8 |
HIP 24802 |
11.79 |
| 2026-05-25 12:00 |
05:19:48.17 |
+09:14:01.7 |
HIP 24802 |
12.12 |
| 2026-05-26 00:00 |
05:19:49.55 |
+09:14:04.5 |
HIP 24802 |
12.45 |
| 2026-05-26 12:00 |
05:19:50.93 |
+09:14:07.3 |
HIP 24802 |
12.79 |
| 2026-05-27 00:00 |
05:19:52.31 |
+09:14:10.1 |
HIP 24802 |
13.12 |
| 2026-05-27 12:00 |
05:19:53.70 |
+09:14:12.8 |
HIP 24802 |
13.46 |
| 2026-05-28 00:00 |
05:19:55.09 |
+09:14:15.5 |
HIP 24802 |
13.80 |
| 2026-05-28 12:00 |
05:19:56.49 |
+09:14:18.2 |
HIP 24802 |
14.13 |
| 2026-05-29 00:00 |
05:19:57.88 |
+09:14:20.8 |
HIP 24802 |
14.47 |
| 2026-05-29 12:00 |
05:19:59.28 |
+09:14:23.4 |
HIP 24802 |
14.81 |
| 2026-05-30 00:00 |
05:20:00.69 |
+09:14:25.9 |
HIP 24802 |
15.15 |
| 2026-05-30 12:00 |
05:20:02.09 |
+09:14:28.4 |
HIP 24802 |
15.49 |
| 2026-05-31 00:00 |
05:20:03.50 |
+09:14:30.8 |
HIP 24802 |
15.84 |
| 2026-05-31 12:00 |
05:20:04.91 |
+09:14:33.2 |
HIP 24802 |
16.18 |
| 2026-06-01 00:00 |
05:20:06.32 |
+09:14:35.6 |
HIP 24802 |
16.52 |
| 2026-06-01 12:00 |
05:20:07.74 |
+09:14:37.9 |
HIP 24802 |
16.87 |
| 2026-06-02 00:00 |
05:20:09.15 |
+09:14:40.2 |
HIP 24802 |
17.21 |