| Parameter |
Value |
| Designation |
424P/La Sagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-08-16T14:00:44.933760Z |
| Orbit solution date (soln_date, UTC) |
2022-02-14T01:12:55Z |
| Obs used |
614 |
| NEO |
- |
| M1 |
17.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-06-06T12:36:39.744000Z |
| Discovery magnitude (MPC) |
20.60 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-05-02.0000000 |
| e |
0.69277912 |
| q (au) |
1.351983 |
| a (au) |
4.400689 |
| i (deg) |
8.637783 |
| Ω (om, deg) |
51.619990 |
| ω (w, deg) |
312.445906 |
| M (ma, deg) |
144.602315 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.866 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.866 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.862 |
| k |
0.990 |
| 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 |
12:28:01.39 |
+02:52:09.7 |
HIP 60847 |
24.41 |
| 2026-09-20 12:00 |
12:28:16.52 |
+02:50:24.1 |
HIP 60847 |
25.85 |
| 2026-09-21 00:00 |
12:28:31.66 |
+02:48:38.6 |
HIP 60847 |
27.84 |
| 2026-09-21 12:00 |
12:28:46.82 |
+02:46:53.1 |
HIP 60847 |
30.29 |
| 2026-09-22 00:00 |
12:29:01.99 |
+02:45:07.7 |
HIP 60847 |
33.07 |
| 2026-09-22 12:00 |
12:29:17.17 |
+02:43:22.3 |
HIP 60847 |
36.13 |
| 2026-09-23 00:00 |
12:29:32.37 |
+02:41:37.1 |
HIP 61096 |
35.19 |
| 2026-09-23 12:00 |
12:29:47.58 |
+02:39:51.9 |
HIP 61096 |
31.22 |
| 2026-09-24 00:00 |
12:30:02.80 |
+02:38:06.8 |
HIP 61096 |
27.30 |
| 2026-09-24 12:00 |
12:30:18.04 |
+02:36:21.8 |
HIP 61096 |
23.48 |
| 2026-09-25 00:00 |
12:30:33.28 |
+02:34:36.9 |
HIP 61096 |
19.81 |
| 2026-09-25 12:00 |
12:30:48.54 |
+02:32:52.1 |
HIP 61096 |
16.38 |
| 2026-09-26 00:00 |
12:31:03.80 |
+02:31:07.4 |
HIP 61096 |
13.41 |
| 2026-09-26 12:00 |
12:31:19.08 |
+02:29:22.8 |
HIP 61096 |
11.23 |
| 2026-09-27 00:00 |
12:31:34.37 |
+02:27:38.3 |
HIP 61096 |
10.39 |
| 2026-09-27 12:00 |
12:31:49.66 |
+02:25:53.9 |
HIP 61096 |
11.18 |
| 2026-09-28 00:00 |
12:32:04.96 |
+02:24:09.6 |
HIP 61096 |
13.31 |
| 2026-09-28 12:00 |
12:32:20.27 |
+02:22:25.5 |
HIP 61096 |
16.28 |
| 2026-09-29 00:00 |
12:32:35.59 |
+02:20:41.4 |
HIP 61096 |
19.70 |
| 2026-09-29 12:00 |
12:32:50.91 |
+02:18:57.5 |
HIP 61096 |
23.38 |
| 2026-09-30 00:00 |
12:33:06.24 |
+02:17:13.7 |
HIP 61096 |
27.21 |
| 2026-09-30 12:00 |
12:33:21.58 |
+02:15:30.1 |
HIP 61428 |
28.59 |
| 2026-10-01 00:00 |
12:33:36.92 |
+02:13:46.6 |
HIP 61428 |
24.83 |
| 2026-10-01 12:00 |
12:33:52.26 |
+02:12:03.2 |
HIP 61428 |
21.23 |
| 2026-10-02 00:00 |
12:34:07.61 |
+02:10:19.9 |
HIP 61428 |
17.90 |
| 2026-10-02 12:00 |
12:34:22.97 |
+02:08:36.8 |
HIP 61428 |
15.01 |
| 2026-10-03 00:00 |
12:34:38.32 |
+02:06:53.9 |
HIP 61428 |
12.86 |
| 2026-10-03 12:00 |
12:34:53.68 |
+02:05:11.1 |
HIP 61428 |
11.86 |
| 2026-10-04 00:00 |
12:35:09.04 |
+02:03:28.5 |
HIP 61428 |
12.30 |
| 2026-10-04 12:00 |
12:35:24.40 |
+02:01:46.0 |
HIP 61428 |
14.04 |
| 2026-10-05 00:00 |
12:35:39.77 |
+02:00:03.7 |
HIP 61428 |
16.68 |
| 2026-10-05 12:00 |
12:35:55.13 |
+01:58:21.5 |
HIP 61428 |
19.86 |
| 2026-10-06 00:00 |
12:36:10.49 |
+01:56:39.6 |
HIP 61428 |
23.36 |
| 2026-10-06 12:00 |
12:36:25.85 |
+01:54:57.8 |
HIP 61643 |
27.05 |
| 2026-10-07 00:00 |
12:36:41.21 |
+01:53:16.2 |
HIP 61643 |
23.60 |
| 2026-10-07 12:00 |
12:36:56.57 |
+01:51:34.7 |
HIP 61643 |
20.42 |
| 2026-10-08 00:00 |
12:37:11.92 |
+01:49:53.5 |
HIP 61643 |
17.67 |
| 2026-10-08 12:00 |
12:37:27.27 |
+01:48:12.5 |
HIP 61658 |
14.13 |
| 2026-10-09 00:00 |
12:37:42.62 |
+01:46:31.6 |
HIP 61658 |
11.03 |
| 2026-10-09 12:00 |
12:37:57.96 |
+01:44:51.0 |
HIP 61658 |
8.88 |
| 2026-10-10 00:00 |
12:38:13.29 |
+01:43:10.6 |
HIP 61658 |
8.42 |
| 2026-10-10 12:00 |
12:38:28.62 |
+01:41:30.4 |
HIP 61658 |
9.90 |
| 2026-10-11 00:00 |
12:38:43.94 |
+01:39:50.4 |
HIP 61658 |
12.64 |