| Parameter |
Value |
| Designation |
P/2013 T1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-31T06:21:57.487680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:40Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-10-08.0000000 |
| e |
0.62326867 |
| q (au) |
2.210495 |
| a (au) |
5.867565 |
| i (deg) |
24.210241 |
| Ω (om, deg) |
10.283835 |
| ω (w, deg) |
345.840008 |
| M (ma, deg) |
4.766435 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.931 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.931 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
15:08:52.61 |
-42:56:28.9 |
HIP 74100 |
5.05 |
| 2026-07-29 12:00 |
15:08:55.67 |
-42:54:43.4 |
HIP 74100 |
4.01 |
| 2026-07-30 00:00 |
15:08:59.06 |
-42:52:58.5 |
HIP 74112 |
3.01 |
| 2026-07-30 12:00 |
15:09:02.76 |
-42:51:14.4 |
HIP 74112 |
2.83 |
| 2026-07-31 00:00 |
15:09:06.79 |
-42:49:31.1 |
HIP 74112 |
3.78 |
| 2026-07-31 12:00 |
15:09:11.14 |
-42:47:48.6 |
HIP 74112 |
5.29 |
| 2026-08-01 00:00 |
15:09:15.81 |
-42:46:06.8 |
HIP 74112 |
7.02 |
| 2026-08-01 12:00 |
15:09:20.80 |
-42:44:25.8 |
HIP 74112 |
8.86 |
| 2026-08-02 00:00 |
15:09:26.10 |
-42:42:45.6 |
HIP 74112 |
10.75 |
| 2026-08-02 12:00 |
15:09:31.73 |
-42:41:06.3 |
HIP 74112 |
12.68 |
| 2026-08-03 00:00 |
15:09:37.66 |
-42:39:27.8 |
HIP 74112 |
14.64 |
| 2026-08-03 12:00 |
15:09:43.92 |
-42:37:50.1 |
HIP 74112 |
16.63 |
| 2026-08-04 00:00 |
15:09:50.49 |
-42:36:13.3 |
HIP 74112 |
18.64 |
| 2026-08-04 12:00 |
15:09:57.37 |
-42:34:37.3 |
HIP 74112 |
20.68 |
| 2026-08-05 00:00 |
15:10:04.57 |
-42:33:02.2 |
HIP 74112 |
22.75 |
| 2026-08-05 12:00 |
15:10:12.08 |
-42:31:28.0 |
HIP 74112 |
24.84 |
| 2026-08-06 00:00 |
15:10:19.90 |
-42:29:54.6 |
HIP 74348 |
23.68 |
| 2026-08-06 12:00 |
15:10:28.03 |
-42:28:22.2 |
HIP 74348 |
21.54 |
| 2026-08-07 00:00 |
15:10:36.47 |
-42:26:50.7 |
HIP 74348 |
19.38 |
| 2026-08-07 12:00 |
15:10:45.22 |
-42:25:20.0 |
HIP 74348 |
17.20 |
| 2026-08-08 00:00 |
15:10:54.28 |
-42:23:50.3 |
HIP 74348 |
15.02 |
| 2026-08-08 12:00 |
15:11:03.65 |
-42:22:21.6 |
HIP 74348 |
12.83 |
| 2026-08-09 00:00 |
15:11:13.32 |
-42:20:53.7 |
HIP 74348 |
10.67 |
| 2026-08-09 12:00 |
15:11:23.30 |
-42:19:26.8 |
HIP 74348 |
8.59 |
| 2026-08-10 00:00 |
15:11:33.59 |
-42:18:00.9 |
HIP 74348 |
6.69 |
| 2026-08-10 12:00 |
15:11:44.18 |
-42:16:35.9 |
HIP 74348 |
5.22 |
| 2026-08-11 00:00 |
15:11:55.07 |
-42:15:12.0 |
HIP 74348 |
4.68 |
| 2026-08-11 12:00 |
15:12:06.27 |
-42:13:48.9 |
HIP 74348 |
5.41 |
| 2026-08-12 00:00 |
15:12:17.76 |
-42:12:26.9 |
HIP 74348 |
7.06 |
| 2026-08-12 12:00 |
15:12:29.56 |
-42:11:05.8 |
HIP 74348 |
9.18 |
| 2026-08-13 00:00 |
15:12:41.66 |
-42:09:45.8 |
HIP 74503 |
9.09 |
| 2026-08-13 12:00 |
15:12:54.06 |
-42:08:26.7 |
HIP 74503 |
6.96 |
| 2026-08-14 00:00 |
15:13:06.75 |
-42:07:08.7 |
HIP 74503 |
5.26 |
| 2026-08-14 12:00 |
15:13:19.74 |
-42:05:51.6 |
HIP 74503 |
4.58 |
| 2026-08-15 00:00 |
15:13:33.02 |
-42:04:35.6 |
HIP 74503 |
5.38 |
| 2026-08-15 12:00 |
15:13:46.60 |
-42:03:20.6 |
HIP 74503 |
7.24 |
| 2026-08-16 00:00 |
15:14:00.47 |
-42:02:06.6 |
HIP 74503 |
9.59 |
| 2026-08-16 12:00 |
15:14:14.63 |
-42:00:53.7 |
HIP 74503 |
12.19 |
| 2026-08-17 00:00 |
15:14:29.08 |
-41:59:41.7 |
HIP 74503 |
14.92 |
| 2026-08-17 12:00 |
15:14:43.82 |
-41:58:30.8 |
HIP 74503 |
17.75 |
| 2026-08-18 00:00 |
15:14:58.84 |
-41:57:21.0 |
HIP 74503 |
20.65 |
| 2026-08-18 12:00 |
15:15:14.15 |
-41:56:12.1 |
HIP 74807 |
22.94 |
| 2026-08-19 00:00 |
15:15:29.75 |
-41:55:04.3 |
HIP 74807 |
20.04 |