| Parameter |
Value |
| Designation |
233P/La Sagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-06-25T04:02:51.938880Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:46Z |
| Obs used |
183 |
| NEO |
- |
| M1 |
18.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-12-06.0000000 |
| e |
0.41125246 |
| q (au) |
1.783755 |
| a (au) |
3.029745 |
| i (deg) |
11.284516 |
| Ω (om, deg) |
74.928208 |
| ω (w, deg) |
27.125495 |
| M (ma, deg) |
167.238481 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.663 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.663 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.857 |
| k |
0.999 |
| δ90 |
9.995 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
12:52:44.69 |
+01:57:33.4 |
HIP 62835 |
2.82 |
| 2026-09-20 12:00 |
12:53:32.78 |
+01:51:48.5 |
HIP 62835 |
15.44 |
| 2026-09-21 00:00 |
12:54:20.83 |
+01:46:04.3 |
HIP 63052 |
20.83 |
| 2026-09-21 12:00 |
12:55:08.85 |
+01:40:20.8 |
HIP 63052 |
11.23 |
| 2026-09-22 00:00 |
12:55:56.83 |
+01:34:38.0 |
HIP 63052 |
13.12 |
| 2026-09-22 12:00 |
12:56:44.79 |
+01:28:55.9 |
HIP 63235 |
10.88 |
| 2026-09-23 00:00 |
12:57:32.71 |
+01:23:14.5 |
HIP 63235 |
2.91 |
| 2026-09-23 12:00 |
12:58:20.59 |
+01:17:33.8 |
HIP 63235 |
15.81 |
| 2026-09-24 00:00 |
12:59:08.44 |
+01:11:53.8 |
HIP 63235 |
29.01 |
| 2026-09-24 12:00 |
12:59:56.26 |
+01:06:14.6 |
HIP 63560 |
34.32 |
| 2026-09-25 00:00 |
13:00:44.05 |
+01:00:36.0 |
HIP 63545 |
31.65 |
| 2026-09-25 12:00 |
13:01:31.80 |
+00:54:58.2 |
HIP 63615 |
24.48 |
| 2026-09-26 00:00 |
13:02:19.52 |
+00:49:21.2 |
HIP 63615 |
16.14 |
| 2026-09-26 12:00 |
13:03:07.21 |
+00:43:44.8 |
HIP 63615 |
16.41 |
| 2026-09-27 00:00 |
13:03:54.87 |
+00:38:09.2 |
HIP 63810 |
23.91 |
| 2026-09-27 12:00 |
13:04:42.49 |
+00:32:34.3 |
HIP 63810 |
14.86 |
| 2026-09-28 00:00 |
13:05:30.08 |
+00:27:00.2 |
HIP 63810 |
14.69 |
| 2026-09-28 12:00 |
13:06:17.64 |
+00:21:26.8 |
HIP 64030 |
20.69 |
| 2026-09-29 00:00 |
13:07:05.17 |
+00:15:54.1 |
HIP 64030 |
19.55 |
| 2026-09-29 12:00 |
13:07:52.67 |
+00:10:22.2 |
HIP 64030 |
26.07 |
| 2026-09-30 00:00 |
13:08:40.14 |
+00:04:51.0 |
HIP 64001 |
31.17 |
| 2026-09-30 12:00 |
13:09:27.57 |
-00:00:39.4 |
HIP 64298 |
30.92 |
| 2026-10-01 00:00 |
13:10:14.97 |
-00:06:09.1 |
HIP 64298 |
20.24 |
| 2026-10-01 12:00 |
13:11:02.35 |
-00:11:38.0 |
HIP 64298 |
14.32 |
| 2026-10-02 00:00 |
13:11:49.69 |
-00:17:06.1 |
HIP 64298 |
18.47 |
| 2026-10-02 12:00 |
13:12:37.00 |
-00:22:33.5 |
HIP 64571 |
23.36 |
| 2026-10-03 00:00 |
13:13:24.28 |
-00:28:00.1 |
HIP 64571 |
16.36 |
| 2026-10-03 12:00 |
13:14:11.53 |
-00:33:26.0 |
HIP 64571 |
18.09 |
| 2026-10-04 00:00 |
13:14:58.75 |
-00:38:51.0 |
HIP 64571 |
26.92 |
| 2026-10-04 12:00 |
13:15:45.94 |
-00:44:15.3 |
HIP 64838 |
26.25 |
| 2026-10-05 00:00 |
13:16:33.10 |
-00:49:38.8 |
HIP 64838 |
16.86 |
| 2026-10-05 12:00 |
13:17:20.23 |
-00:55:01.5 |
HIP 64838 |
14.66 |
| 2026-10-06 00:00 |
13:18:07.32 |
-01:00:23.5 |
HIP 64968 |
20.28 |
| 2026-10-06 12:00 |
13:18:54.39 |
-01:05:44.6 |
HIP 64968 |
10.46 |
| 2026-10-07 00:00 |
13:19:41.42 |
-01:11:04.9 |
HIP 64968 |
11.91 |
| 2026-10-07 12:00 |
13:20:28.43 |
-01:16:24.5 |
HIP 64968 |
22.52 |
| 2026-10-08 00:00 |
13:21:15.40 |
-01:21:43.2 |
HIP 65083 |
21.74 |
| 2026-10-08 12:00 |
13:22:02.34 |
-01:27:01.1 |
HIP 65083 |
27.33 |
| 2026-10-09 00:00 |
13:22:49.25 |
-01:32:18.2 |
HIP 65083 |
36.78 |
| 2026-10-09 12:00 |
13:23:36.13 |
-01:37:34.4 |
HIP 65397 |
30.35 |
| 2026-10-10 00:00 |
13:24:22.97 |
-01:42:49.8 |
HIP 65399 |
23.70 |
| 2026-10-10 12:00 |
13:25:09.78 |
-01:48:04.4 |
HIP 65399 |
22.96 |
| 2026-10-11 00:00 |
13:25:56.56 |
-01:53:18.2 |
HIP 65478 |
22.87 |