| Parameter |
Value |
| Designation |
P/2009 T2 (La Sagra) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-01-12T20:11:46.766400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:35Z |
| Obs used |
882 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-11-18.0000000 |
| e |
0.76899059 |
| q (au) |
1.754750 |
| a (au) |
7.596009 |
| i (deg) |
28.106386 |
| Ω (om, deg) |
215.985632 |
| ω (w, deg) |
215.470914 |
| M (ma, deg) |
357.371046 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.467 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.467 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.867 |
| k |
0.998 |
| 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) |
| 2026-03-26 00:00 |
18:24:10.16 |
-00:03:44.4 |
HIP 90173 |
4.15 |
| 2026-03-26 12:00 |
18:24:12.21 |
-00:02:33.3 |
HIP 90173 |
3.51 |
| 2026-03-27 00:00 |
18:24:14.17 |
-00:01:22.1 |
HIP 90173 |
3.25 |
| 2026-03-27 12:00 |
18:24:16.05 |
-00:00:10.8 |
HIP 90173 |
3.46 |
| 2026-03-28 00:00 |
18:24:17.83 |
+00:01:00.5 |
HIP 90173 |
4.06 |
| 2026-03-28 12:00 |
18:24:19.53 |
+00:02:11.8 |
HIP 90173 |
4.90 |
| 2026-03-29 00:00 |
18:24:21.13 |
+00:03:23.2 |
HIP 90173 |
5.88 |
| 2026-03-29 12:00 |
18:24:22.65 |
+00:04:34.7 |
HIP 90173 |
6.93 |
| 2026-03-30 00:00 |
18:24:24.07 |
+00:05:46.1 |
HIP 90173 |
8.02 |
| 2026-03-30 12:00 |
18:24:25.41 |
+00:06:57.6 |
HIP 90173 |
9.14 |
| 2026-03-31 00:00 |
18:24:26.65 |
+00:08:09.2 |
HIP 90173 |
10.27 |
| 2026-03-31 12:00 |
18:24:27.81 |
+00:09:20.7 |
HIP 90173 |
11.41 |
| 2026-04-01 00:00 |
18:24:28.87 |
+00:10:32.3 |
HIP 90173 |
12.55 |
| 2026-04-01 12:00 |
18:24:29.84 |
+00:11:43.9 |
HIP 90173 |
13.70 |
| 2026-04-02 00:00 |
18:24:30.72 |
+00:12:55.5 |
HIP 90173 |
14.85 |
| 2026-04-02 12:00 |
18:24:31.51 |
+00:14:07.1 |
HIP 90173 |
15.99 |
| 2026-04-03 00:00 |
18:24:32.21 |
+00:15:18.7 |
HIP 90123 |
16.83 |
| 2026-04-03 12:00 |
18:24:32.82 |
+00:16:30.3 |
HIP 90123 |
16.64 |
| 2026-04-04 00:00 |
18:24:33.34 |
+00:17:41.9 |
HIP 90123 |
16.52 |
| 2026-04-04 12:00 |
18:24:33.76 |
+00:18:53.5 |
HIP 90123 |
16.46 |
| 2026-04-05 00:00 |
18:24:34.10 |
+00:20:05.0 |
HIP 90123 |
16.47 |
| 2026-04-05 12:00 |
18:24:34.34 |
+00:21:16.6 |
HIP 90123 |
16.54 |
| 2026-04-06 00:00 |
18:24:34.49 |
+00:22:28.1 |
HIP 90123 |
16.67 |
| 2026-04-06 12:00 |
18:24:34.54 |
+00:23:39.5 |
HIP 90123 |
16.86 |
| 2026-04-07 00:00 |
18:24:34.51 |
+00:24:51.0 |
HIP 90123 |
17.11 |
| 2026-04-07 12:00 |
18:24:34.38 |
+00:26:02.4 |
HIP 90123 |
17.41 |
| 2026-04-08 00:00 |
18:24:34.17 |
+00:27:13.7 |
HIP 90123 |
17.77 |
| 2026-04-08 12:00 |
18:24:33.85 |
+00:28:25.1 |
HIP 90123 |
18.18 |
| 2026-04-09 00:00 |
18:24:33.45 |
+00:29:36.3 |
HIP 90123 |
18.64 |
| 2026-04-09 12:00 |
18:24:32.95 |
+00:30:47.5 |
HIP 90123 |
19.14 |
| 2026-04-10 00:00 |
18:24:32.37 |
+00:31:58.6 |
HIP 90161 |
18.81 |
| 2026-04-10 12:00 |
18:24:31.69 |
+00:33:09.7 |
HIP 90161 |
17.69 |
| 2026-04-11 00:00 |
18:24:30.91 |
+00:34:20.6 |
HIP 90161 |
16.58 |
| 2026-04-11 12:00 |
18:24:30.04 |
+00:35:31.5 |
HIP 90161 |
15.47 |
| 2026-04-12 00:00 |
18:24:29.09 |
+00:36:42.3 |
HIP 90161 |
14.36 |
| 2026-04-12 12:00 |
18:24:28.03 |
+00:37:53.0 |
HIP 90161 |
13.25 |
| 2026-04-13 00:00 |
18:24:26.89 |
+00:39:03.7 |
HIP 90161 |
12.15 |
| 2026-04-13 12:00 |
18:24:25.65 |
+00:40:14.2 |
HIP 90161 |
11.06 |
| 2026-04-14 00:00 |
18:24:24.32 |
+00:41:24.6 |
HIP 90161 |
9.98 |
| 2026-04-14 12:00 |
18:24:22.90 |
+00:42:34.9 |
HIP 90161 |
8.92 |
| 2026-04-15 00:00 |
18:24:21.38 |
+00:43:45.0 |
HIP 90161 |
7.89 |
| 2026-04-15 12:00 |
18:24:19.77 |
+00:44:55.1 |
HIP 90161 |
6.91 |
| 2026-04-16 00:00 |
18:24:18.07 |
+00:46:05.0 |
HIP 90161 |
6.00 |