C/1980 L1 (Torres)
| 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) |
| 2026-02-03 00:00 |
04:53:26.76 |
+67:54:27.3 |
HIP 22707 |
18.68 |
| 2026-02-03 12:00 |
04:53:24.49 |
+67:54:09.7 |
HIP 22707 |
18.94 |
| 2026-02-04 00:00 |
04:53:22.25 |
+67:53:51.9 |
HIP 22707 |
19.21 |
| 2026-02-04 12:00 |
04:53:20.04 |
+67:53:34.2 |
HIP 22707 |
19.48 |
| 2026-02-05 00:00 |
04:53:17.88 |
+67:53:16.3 |
HIP 22707 |
19.75 |
| 2026-02-05 12:00 |
04:53:15.75 |
+67:52:58.4 |
HIP 22707 |
20.03 |
| 2026-02-06 00:00 |
04:53:13.65 |
+67:52:40.5 |
HIP 22707 |
20.32 |
| 2026-02-06 12:00 |
04:53:11.59 |
+67:52:22.4 |
HIP 22707 |
20.61 |
| 2026-02-07 00:00 |
04:53:09.57 |
+67:52:04.4 |
HIP 22707 |
20.90 |
| 2026-02-07 12:00 |
04:53:07.59 |
+67:51:46.2 |
HIP 22707 |
21.19 |
| 2026-02-08 00:00 |
04:53:05.64 |
+67:51:28.0 |
HIP 22552 |
21.42 |
| 2026-02-08 12:00 |
04:53:03.73 |
+67:51:09.8 |
HIP 22552 |
21.60 |
| 2026-02-09 00:00 |
04:53:01.85 |
+67:50:51.5 |
HIP 22552 |
21.78 |
| 2026-02-09 12:00 |
04:53:00.02 |
+67:50:33.2 |
HIP 22768 |
21.86 |
| 2026-02-10 00:00 |
04:52:58.22 |
+67:50:14.8 |
HIP 22768 |
21.60 |
| 2026-02-10 12:00 |
04:52:56.45 |
+67:49:56.4 |
HIP 22768 |
21.35 |
| 2026-02-11 00:00 |
04:52:54.73 |
+67:49:37.9 |
HIP 22768 |
21.09 |
| 2026-02-11 12:00 |
04:52:53.04 |
+67:49:19.4 |
HIP 22768 |
20.83 |
| 2026-02-12 00:00 |
04:52:51.39 |
+67:49:00.8 |
HIP 22768 |
20.58 |
| 2026-02-12 12:00 |
04:52:49.78 |
+67:48:42.2 |
HIP 22768 |
20.33 |
| 2026-02-13 00:00 |
04:52:48.21 |
+67:48:23.6 |
HIP 22768 |
20.07 |
| 2026-02-13 12:00 |
04:52:46.67 |
+67:48:04.9 |
HIP 22768 |
19.82 |
| 2026-02-14 00:00 |
04:52:45.18 |
+67:47:46.2 |
HIP 22768 |
19.57 |
| 2026-02-14 12:00 |
04:52:43.72 |
+67:47:27.5 |
HIP 22768 |
19.32 |
| 2026-02-15 00:00 |
04:52:42.30 |
+67:47:08.7 |
HIP 22768 |
19.07 |
| 2026-02-15 12:00 |
04:52:40.92 |
+67:46:49.9 |
HIP 22768 |
18.83 |
| 2026-02-16 00:00 |
04:52:39.58 |
+67:46:31.0 |
HIP 22768 |
18.58 |
| 2026-02-16 12:00 |
04:52:38.27 |
+67:46:12.2 |
HIP 22768 |
18.34 |
| 2026-02-17 00:00 |
04:52:37.01 |
+67:45:53.3 |
HIP 22768 |
18.09 |
| 2026-02-17 12:00 |
04:52:35.78 |
+67:45:34.3 |
HIP 22768 |
17.85 |
| 2026-02-18 00:00 |
04:52:34.59 |
+67:45:15.4 |
HIP 22768 |
17.61 |
| 2026-02-18 12:00 |
04:52:33.45 |
+67:44:56.4 |
HIP 22768 |
17.37 |
| 2026-02-19 00:00 |
04:52:32.34 |
+67:44:37.5 |
HIP 22768 |
17.13 |
| 2026-02-19 12:00 |
04:52:31.27 |
+67:44:18.5 |
HIP 22768 |
16.90 |
| 2026-02-20 00:00 |
04:52:30.24 |
+67:43:59.4 |
HIP 22768 |
16.66 |
| 2026-02-20 12:00 |
04:52:29.25 |
+67:43:40.4 |
HIP 22768 |
16.43 |
| 2026-02-21 00:00 |
04:52:28.29 |
+67:43:21.3 |
HIP 22768 |
16.19 |
| 2026-02-21 12:00 |
04:52:27.38 |
+67:43:02.3 |
HIP 22768 |
15.96 |
| 2026-02-22 00:00 |
04:52:26.51 |
+67:42:43.2 |
HIP 22768 |
15.73 |
| 2026-02-22 12:00 |
04:52:25.67 |
+67:42:24.1 |
HIP 22768 |
15.50 |
| 2026-02-23 00:00 |
04:52:24.87 |
+67:42:05.0 |
HIP 22768 |
15.27 |
| 2026-02-23 12:00 |
04:52:24.12 |
+67:41:45.9 |
HIP 22768 |
15.05 |
| 2026-02-24 00:00 |
04:52:23.40 |
+67:41:26.8 |
HIP 22768 |
14.82 |