| 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) |
| 2026-07-29 00:00 |
05:22:39.73 |
+09:14:09.8 |
HIP 25123 |
0.41 |
| 2026-07-29 12:00 |
05:22:40.75 |
+09:14:07.0 |
HIP 25123 |
0.44 |
| 2026-07-30 00:00 |
05:22:41.76 |
+09:14:04.2 |
HIP 25123 |
0.59 |
| 2026-07-30 12:00 |
05:22:42.76 |
+09:14:01.3 |
HIP 25123 |
0.79 |
| 2026-07-31 00:00 |
05:22:43.75 |
+09:13:58.4 |
HIP 25123 |
1.02 |
| 2026-07-31 12:00 |
05:22:44.73 |
+09:13:55.4 |
HIP 25123 |
1.25 |
| 2026-08-01 00:00 |
05:22:45.71 |
+09:13:52.5 |
HIP 25123 |
1.48 |
| 2026-08-01 12:00 |
05:22:46.67 |
+09:13:49.4 |
HIP 25123 |
1.72 |
| 2026-08-02 00:00 |
05:22:47.63 |
+09:13:46.4 |
HIP 25123 |
1.95 |
| 2026-08-02 12:00 |
05:22:48.57 |
+09:13:43.3 |
HIP 25123 |
2.19 |
| 2026-08-03 00:00 |
05:22:49.51 |
+09:13:40.1 |
HIP 25123 |
2.42 |
| 2026-08-03 12:00 |
05:22:50.44 |
+09:13:37.0 |
HIP 25123 |
2.65 |
| 2026-08-04 00:00 |
05:22:51.36 |
+09:13:33.8 |
HIP 25123 |
2.88 |
| 2026-08-04 12:00 |
05:22:52.27 |
+09:13:30.5 |
HIP 25123 |
3.11 |
| 2026-08-05 00:00 |
05:22:53.17 |
+09:13:27.2 |
HIP 25123 |
3.33 |
| 2026-08-05 12:00 |
05:22:54.06 |
+09:13:23.9 |
HIP 25123 |
3.56 |
| 2026-08-06 00:00 |
05:22:54.95 |
+09:13:20.5 |
HIP 25123 |
3.78 |
| 2026-08-06 12:00 |
05:22:55.82 |
+09:13:17.1 |
HIP 25123 |
4.00 |
| 2026-08-07 00:00 |
05:22:56.68 |
+09:13:13.7 |
HIP 25123 |
4.22 |
| 2026-08-07 12:00 |
05:22:57.54 |
+09:13:10.2 |
HIP 25123 |
4.44 |
| 2026-08-08 00:00 |
05:22:58.38 |
+09:13:06.7 |
HIP 25123 |
4.65 |
| 2026-08-08 12:00 |
05:22:59.21 |
+09:13:03.2 |
HIP 25123 |
4.86 |
| 2026-08-09 00:00 |
05:23:00.04 |
+09:12:59.6 |
HIP 25123 |
5.07 |
| 2026-08-09 12:00 |
05:23:00.85 |
+09:12:56.0 |
HIP 25123 |
5.28 |
| 2026-08-10 00:00 |
05:23:01.65 |
+09:12:52.3 |
HIP 25123 |
5.48 |
| 2026-08-10 12:00 |
05:23:02.45 |
+09:12:48.6 |
HIP 25123 |
5.69 |
| 2026-08-11 00:00 |
05:23:03.23 |
+09:12:44.9 |
HIP 25123 |
5.89 |
| 2026-08-11 12:00 |
05:23:04.00 |
+09:12:41.1 |
HIP 25123 |
6.09 |
| 2026-08-12 00:00 |
05:23:04.76 |
+09:12:37.3 |
HIP 25123 |
6.28 |
| 2026-08-12 12:00 |
05:23:05.52 |
+09:12:33.5 |
HIP 25123 |
6.48 |
| 2026-08-13 00:00 |
05:23:06.26 |
+09:12:29.6 |
HIP 25123 |
6.67 |
| 2026-08-13 12:00 |
05:23:06.99 |
+09:12:25.7 |
HIP 25123 |
6.86 |
| 2026-08-14 00:00 |
05:23:07.71 |
+09:12:21.8 |
HIP 25123 |
7.05 |
| 2026-08-14 12:00 |
05:23:08.42 |
+09:12:17.8 |
HIP 25123 |
7.23 |
| 2026-08-15 00:00 |
05:23:09.12 |
+09:12:13.8 |
HIP 25123 |
7.41 |
| 2026-08-15 12:00 |
05:23:09.81 |
+09:12:09.8 |
HIP 25123 |
7.59 |
| 2026-08-16 00:00 |
05:23:10.48 |
+09:12:05.7 |
HIP 25123 |
7.77 |
| 2026-08-16 12:00 |
05:23:11.15 |
+09:12:01.6 |
HIP 25123 |
7.95 |
| 2026-08-17 00:00 |
05:23:11.81 |
+09:11:57.5 |
HIP 25123 |
8.12 |
| 2026-08-17 12:00 |
05:23:12.45 |
+09:11:53.3 |
HIP 25123 |
8.29 |
| 2026-08-18 00:00 |
05:23:13.08 |
+09:11:49.1 |
HIP 25123 |
8.46 |
| 2026-08-18 12:00 |
05:23:13.71 |
+09:11:44.9 |
HIP 25123 |
8.62 |
| 2026-08-19 00:00 |
05:23:14.32 |
+09:11:40.7 |
HIP 25123 |
8.79 |