| Parameter |
Value |
| Designation |
C/1997 L1 (Zhu-Balam) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-11-22T20:49:19.153920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:51Z |
| Obs used |
213 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-08-22.0000000 |
| e |
0.99797377 |
| q (au) |
4.899563 |
| a (au) |
2418.066374 |
| i (deg) |
72.991461 |
| Ω (om, deg) |
233.299834 |
| ω (w, deg) |
346.364690 |
| M (ma, deg) |
0.002256 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.899 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.899 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
00:21:26.85 |
+54:40:27.1 |
HIP 1794 |
11.83 |
| 2026-03-26 12:00 |
00:21:30.90 |
+54:40:34.1 |
HIP 1794 |
11.27 |
| 2026-03-27 00:00 |
00:21:34.94 |
+54:40:41.3 |
HIP 1794 |
10.72 |
| 2026-03-27 12:00 |
00:21:38.98 |
+54:40:48.7 |
HIP 1794 |
10.17 |
| 2026-03-28 00:00 |
00:21:43.02 |
+54:40:56.3 |
HIP 1794 |
9.62 |
| 2026-03-28 12:00 |
00:21:47.06 |
+54:41:04.2 |
HIP 1794 |
9.09 |
| 2026-03-29 00:00 |
00:21:51.10 |
+54:41:12.4 |
HIP 1794 |
8.56 |
| 2026-03-29 12:00 |
00:21:55.13 |
+54:41:20.7 |
HIP 1794 |
8.05 |
| 2026-03-30 00:00 |
00:21:59.17 |
+54:41:29.3 |
HIP 1794 |
7.55 |
| 2026-03-30 12:00 |
00:22:03.20 |
+54:41:38.1 |
HIP 1794 |
7.07 |
| 2026-03-31 00:00 |
00:22:07.23 |
+54:41:47.2 |
HIP 1794 |
6.61 |
| 2026-03-31 12:00 |
00:22:11.26 |
+54:41:56.4 |
HIP 1794 |
6.18 |
| 2026-04-01 00:00 |
00:22:15.29 |
+54:42:05.9 |
HIP 1794 |
5.78 |
| 2026-04-01 12:00 |
00:22:19.31 |
+54:42:15.7 |
HIP 1794 |
5.43 |
| 2026-04-02 00:00 |
00:22:23.33 |
+54:42:25.6 |
HIP 1794 |
5.12 |
| 2026-04-02 12:00 |
00:22:27.34 |
+54:42:35.8 |
HIP 1794 |
4.87 |
| 2026-04-03 00:00 |
00:22:31.36 |
+54:42:46.2 |
HIP 1794 |
4.69 |
| 2026-04-03 12:00 |
00:22:35.36 |
+54:42:56.8 |
HIP 1794 |
4.59 |
| 2026-04-04 00:00 |
00:22:39.37 |
+54:43:07.7 |
HIP 1794 |
4.57 |
| 2026-04-04 12:00 |
00:22:43.37 |
+54:43:18.7 |
HIP 1794 |
4.63 |
| 2026-04-05 00:00 |
00:22:47.36 |
+54:43:30.0 |
HIP 1794 |
4.77 |
| 2026-04-05 12:00 |
00:22:51.36 |
+54:43:41.5 |
HIP 1794 |
4.99 |
| 2026-04-06 00:00 |
00:22:55.34 |
+54:43:53.2 |
HIP 1794 |
5.27 |
| 2026-04-06 12:00 |
00:22:59.32 |
+54:44:05.2 |
HIP 1794 |
5.61 |
| 2026-04-07 00:00 |
00:23:03.30 |
+54:44:17.3 |
HIP 1794 |
6.00 |
| 2026-04-07 12:00 |
00:23:07.27 |
+54:44:29.7 |
HIP 1794 |
6.42 |
| 2026-04-08 00:00 |
00:23:11.23 |
+54:44:42.3 |
HIP 1794 |
6.87 |
| 2026-04-08 12:00 |
00:23:15.19 |
+54:44:55.1 |
HIP 1794 |
7.35 |
| 2026-04-09 00:00 |
00:23:19.14 |
+54:45:08.1 |
HIP 1794 |
7.85 |
| 2026-04-09 12:00 |
00:23:23.08 |
+54:45:21.3 |
HIP 1794 |
8.36 |
| 2026-04-10 00:00 |
00:23:27.02 |
+54:45:34.8 |
HIP 1794 |
8.89 |
| 2026-04-10 12:00 |
00:23:30.95 |
+54:45:48.4 |
HIP 1794 |
9.43 |
| 2026-04-11 00:00 |
00:23:34.87 |
+54:46:02.3 |
HIP 1794 |
9.98 |
| 2026-04-11 12:00 |
00:23:38.79 |
+54:46:16.3 |
HIP 1794 |
10.54 |
| 2026-04-12 00:00 |
00:23:42.70 |
+54:46:30.6 |
HIP 1794 |
11.11 |
| 2026-04-12 12:00 |
00:23:46.60 |
+54:46:45.1 |
HIP 1794 |
11.68 |
| 2026-04-13 00:00 |
00:23:50.49 |
+54:46:59.7 |
HIP 1794 |
12.26 |
| 2026-04-13 12:00 |
00:23:54.37 |
+54:47:14.6 |
HIP 1794 |
12.84 |
| 2026-04-14 00:00 |
00:23:58.24 |
+54:47:29.7 |
HIP 1794 |
13.43 |
| 2026-04-14 12:00 |
00:24:02.11 |
+54:47:45.0 |
HIP 1794 |
14.02 |
| 2026-04-15 00:00 |
00:24:05.96 |
+54:48:00.5 |
HIP 1794 |
14.61 |
| 2026-04-15 12:00 |
00:24:09.81 |
+54:48:16.2 |
HIP 1794 |
15.21 |
| 2026-04-16 00:00 |
00:24:13.64 |
+54:48:32.1 |
HIP 1794 |
15.80 |