| 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) |
| 2026-09-20 00:00 |
05:23:28.64 |
+09:06:18.9 |
HIP 25123 |
14.18 |
| 2026-09-20 12:00 |
05:23:28.46 |
+09:06:13.3 |
HIP 25123 |
14.19 |
| 2026-09-21 00:00 |
05:23:28.26 |
+09:06:07.7 |
HIP 25123 |
14.20 |
| 2026-09-21 12:00 |
05:23:28.05 |
+09:06:02.2 |
HIP 25123 |
14.21 |
| 2026-09-22 00:00 |
05:23:27.83 |
+09:05:56.6 |
HIP 25123 |
14.21 |
| 2026-09-22 12:00 |
05:23:27.60 |
+09:05:51.0 |
HIP 25123 |
14.22 |
| 2026-09-23 00:00 |
05:23:27.35 |
+09:05:45.4 |
HIP 25123 |
14.22 |
| 2026-09-23 12:00 |
05:23:27.10 |
+09:05:39.8 |
HIP 25123 |
14.22 |
| 2026-09-24 00:00 |
05:23:26.82 |
+09:05:34.2 |
HIP 25123 |
14.22 |
| 2026-09-24 12:00 |
05:23:26.54 |
+09:05:28.6 |
HIP 25123 |
14.22 |
| 2026-09-25 00:00 |
05:23:26.24 |
+09:05:23.0 |
HIP 25123 |
14.21 |
| 2026-09-25 12:00 |
05:23:25.94 |
+09:05:17.4 |
HIP 25123 |
14.21 |
| 2026-09-26 00:00 |
05:23:25.61 |
+09:05:11.7 |
HIP 25123 |
14.20 |
| 2026-09-26 12:00 |
05:23:25.28 |
+09:05:06.1 |
HIP 25123 |
14.19 |
| 2026-09-27 00:00 |
05:23:24.93 |
+09:05:00.5 |
HIP 25123 |
14.18 |
| 2026-09-27 12:00 |
05:23:24.58 |
+09:04:54.9 |
HIP 25123 |
14.17 |
| 2026-09-28 00:00 |
05:23:24.20 |
+09:04:49.2 |
HIP 25123 |
14.16 |
| 2026-09-28 12:00 |
05:23:23.82 |
+09:04:43.6 |
HIP 25123 |
14.14 |
| 2026-09-29 00:00 |
05:23:23.42 |
+09:04:38.0 |
HIP 25123 |
14.13 |
| 2026-09-29 12:00 |
05:23:23.01 |
+09:04:32.3 |
HIP 25123 |
14.11 |
| 2026-09-30 00:00 |
05:23:22.59 |
+09:04:26.7 |
HIP 25123 |
14.10 |
| 2026-09-30 12:00 |
05:23:22.16 |
+09:04:21.0 |
HIP 25123 |
14.08 |
| 2026-10-01 00:00 |
05:23:21.71 |
+09:04:15.4 |
HIP 25123 |
14.06 |
| 2026-10-01 12:00 |
05:23:21.26 |
+09:04:09.8 |
HIP 25123 |
14.04 |
| 2026-10-02 00:00 |
05:23:20.78 |
+09:04:04.1 |
HIP 25123 |
14.02 |
| 2026-10-02 12:00 |
05:23:20.30 |
+09:03:58.5 |
HIP 25123 |
14.00 |
| 2026-10-03 00:00 |
05:23:19.81 |
+09:03:52.8 |
HIP 25123 |
13.98 |
| 2026-10-03 12:00 |
05:23:19.30 |
+09:03:47.2 |
HIP 25123 |
13.96 |
| 2026-10-04 00:00 |
05:23:18.78 |
+09:03:41.6 |
HIP 25123 |
13.94 |
| 2026-10-04 12:00 |
05:23:18.24 |
+09:03:35.9 |
HIP 25123 |
13.91 |
| 2026-10-05 00:00 |
05:23:17.70 |
+09:03:30.3 |
HIP 25123 |
13.89 |
| 2026-10-05 12:00 |
05:23:17.14 |
+09:03:24.7 |
HIP 25123 |
13.87 |
| 2026-10-06 00:00 |
05:23:16.57 |
+09:03:19.1 |
HIP 25123 |
13.85 |
| 2026-10-06 12:00 |
05:23:15.99 |
+09:03:13.4 |
HIP 25123 |
13.82 |
| 2026-10-07 00:00 |
05:23:15.40 |
+09:03:07.8 |
HIP 25123 |
13.80 |
| 2026-10-07 12:00 |
05:23:14.79 |
+09:03:02.2 |
HIP 25123 |
13.78 |
| 2026-10-08 00:00 |
05:23:14.17 |
+09:02:56.6 |
HIP 25123 |
13.76 |
| 2026-10-08 12:00 |
05:23:13.54 |
+09:02:51.0 |
HIP 25123 |
13.74 |
| 2026-10-09 00:00 |
05:23:12.90 |
+09:02:45.4 |
HIP 25123 |
13.71 |
| 2026-10-09 12:00 |
05:23:12.25 |
+09:02:39.9 |
HIP 25123 |
13.69 |
| 2026-10-10 00:00 |
05:23:11.58 |
+09:02:34.3 |
HIP 25123 |
13.67 |
| 2026-10-10 12:00 |
05:23:10.90 |
+09:02:28.7 |
HIP 25123 |
13.65 |
| 2026-10-11 00:00 |
05:23:10.21 |
+09:02:23.2 |
HIP 25123 |
13.64 |