| Parameter |
Value |
| Designation |
C/1980 L1 (Torres) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1980-04-19T20:41:49.355520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
58 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
18.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1980-07-25.0000000 |
| e |
1.00017950 |
| q (au) |
2.583907 |
| a (au) |
-14395.126523 |
| i (deg) |
73.148059 |
| Ω (om, deg) |
279.523106 |
| ω (w, deg) |
334.966178 |
| M (ma, deg) |
0.000055 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.586 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.586 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.529 |
| 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) |
| 2026-07-29 00:00 |
05:07:36.83 |
+67:14:38.8 |
HIP 24073 |
19.69 |
| 2026-07-29 12:00 |
05:07:39.73 |
+67:14:52.1 |
HIP 24073 |
19.59 |
| 2026-07-30 00:00 |
05:07:42.60 |
+67:15:05.5 |
HIP 24073 |
19.51 |
| 2026-07-30 12:00 |
05:07:45.45 |
+67:15:19.0 |
HIP 24073 |
19.44 |
| 2026-07-31 00:00 |
05:07:48.27 |
+67:15:32.5 |
HIP 24073 |
19.38 |
| 2026-07-31 12:00 |
05:07:51.07 |
+67:15:46.1 |
HIP 24073 |
19.32 |
| 2026-08-01 00:00 |
05:07:53.83 |
+67:15:59.9 |
HIP 24073 |
19.28 |
| 2026-08-01 12:00 |
05:07:56.58 |
+67:16:13.6 |
HIP 24073 |
19.24 |
| 2026-08-02 00:00 |
05:07:59.29 |
+67:16:27.5 |
HIP 24073 |
19.21 |
| 2026-08-02 12:00 |
05:08:01.98 |
+67:16:41.5 |
HIP 24073 |
19.20 |
| 2026-08-03 00:00 |
05:08:04.64 |
+67:16:55.5 |
HIP 24073 |
19.19 |
| 2026-08-03 12:00 |
05:08:07.27 |
+67:17:09.6 |
HIP 24073 |
19.19 |
| 2026-08-04 00:00 |
05:08:09.88 |
+67:17:23.8 |
HIP 24073 |
19.20 |
| 2026-08-04 12:00 |
05:08:12.46 |
+67:17:38.1 |
HIP 24073 |
19.22 |
| 2026-08-05 00:00 |
05:08:15.01 |
+67:17:52.4 |
HIP 24073 |
19.25 |
| 2026-08-05 12:00 |
05:08:17.53 |
+67:18:06.8 |
HIP 24073 |
19.28 |
| 2026-08-06 00:00 |
05:08:20.03 |
+67:18:21.3 |
HIP 24073 |
19.33 |
| 2026-08-06 12:00 |
05:08:22.49 |
+67:18:35.9 |
HIP 24073 |
19.38 |
| 2026-08-07 00:00 |
05:08:24.93 |
+67:18:50.5 |
HIP 24073 |
19.44 |
| 2026-08-07 12:00 |
05:08:27.34 |
+67:19:05.2 |
HIP 24073 |
19.52 |
| 2026-08-08 00:00 |
05:08:29.72 |
+67:19:20.0 |
HIP 24073 |
19.59 |
| 2026-08-08 12:00 |
05:08:32.07 |
+67:19:34.9 |
HIP 24073 |
19.68 |
| 2026-08-09 00:00 |
05:08:34.39 |
+67:19:49.8 |
HIP 24073 |
19.77 |
| 2026-08-09 12:00 |
05:08:36.68 |
+67:20:04.8 |
HIP 24073 |
19.88 |
| 2026-08-10 00:00 |
05:08:38.94 |
+67:20:19.8 |
HIP 24073 |
19.99 |
| 2026-08-10 12:00 |
05:08:41.17 |
+67:20:34.9 |
HIP 24073 |
20.10 |
| 2026-08-11 00:00 |
05:08:43.37 |
+67:20:50.1 |
HIP 24073 |
20.23 |
| 2026-08-11 12:00 |
05:08:45.54 |
+67:21:05.3 |
HIP 24073 |
20.36 |
| 2026-08-12 00:00 |
05:08:47.68 |
+67:21:20.6 |
HIP 24073 |
20.50 |
| 2026-08-12 12:00 |
05:08:49.78 |
+67:21:36.0 |
HIP 24073 |
20.64 |
| 2026-08-13 00:00 |
05:08:51.86 |
+67:21:51.4 |
HIP 24073 |
20.79 |
| 2026-08-13 12:00 |
05:08:53.91 |
+67:22:06.9 |
HIP 24073 |
20.95 |
| 2026-08-14 00:00 |
05:08:55.92 |
+67:22:22.4 |
HIP 24073 |
21.11 |
| 2026-08-14 12:00 |
05:08:57.90 |
+67:22:38.0 |
HIP 24073 |
21.28 |
| 2026-08-15 00:00 |
05:08:59.85 |
+67:22:53.7 |
HIP 24073 |
21.45 |
| 2026-08-15 12:00 |
05:09:01.77 |
+67:23:09.4 |
HIP 24073 |
21.63 |
| 2026-08-16 00:00 |
05:09:03.66 |
+67:23:25.2 |
HIP 24073 |
21.82 |
| 2026-08-16 12:00 |
05:09:05.51 |
+67:23:41.0 |
HIP 24073 |
22.01 |
| 2026-08-17 00:00 |
05:09:07.33 |
+67:23:56.8 |
HIP 24073 |
22.20 |
| 2026-08-17 12:00 |
05:09:09.12 |
+67:24:12.7 |
HIP 24073 |
22.40 |
| 2026-08-18 00:00 |
05:09:10.88 |
+67:24:28.7 |
HIP 24073 |
22.60 |
| 2026-08-18 12:00 |
05:09:12.60 |
+67:24:44.7 |
HIP 24073 |
22.81 |
| 2026-08-19 00:00 |
05:09:14.29 |
+67:25:00.8 |
HIP 24073 |
23.02 |