P/2013 T1 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
16:02:00.14 |
-37:48:25.4 |
HIP 78533 |
16.37 |
| 2026-02-03 12:00 |
16:02:19.89 |
-37:51:13.7 |
HIP 78533 |
19.62 |
| 2026-02-04 00:00 |
16:02:39.52 |
-37:54:02.1 |
HIP 78500 |
22.92 |
| 2026-02-04 12:00 |
16:02:59.01 |
-37:56:50.7 |
HIP 78747 |
19.97 |
| 2026-02-05 00:00 |
16:03:18.36 |
-37:59:39.4 |
HIP 78747 |
17.39 |
| 2026-02-05 12:00 |
16:03:37.58 |
-38:02:28.3 |
HIP 78747 |
15.86 |
| 2026-02-06 00:00 |
16:03:56.66 |
-38:05:17.4 |
HIP 78747 |
15.68 |
| 2026-02-06 12:00 |
16:04:15.60 |
-38:08:06.6 |
HIP 78747 |
16.88 |
| 2026-02-07 00:00 |
16:04:34.40 |
-38:10:56.0 |
HIP 78747 |
19.18 |
| 2026-02-07 12:00 |
16:04:53.06 |
-38:13:45.5 |
HIP 78881 |
18.89 |
| 2026-02-08 00:00 |
16:05:11.57 |
-38:16:35.2 |
HIP 78881 |
18.26 |
| 2026-02-08 12:00 |
16:05:29.94 |
-38:19:25.0 |
HIP 78881 |
18.79 |
| 2026-02-09 00:00 |
16:05:48.16 |
-38:22:15.0 |
HIP 78881 |
20.38 |
| 2026-02-09 12:00 |
16:06:06.24 |
-38:25:05.1 |
HIP 78881 |
22.79 |
| 2026-02-10 00:00 |
16:06:24.16 |
-38:27:55.4 |
HIP 78881 |
25.79 |
| 2026-02-10 12:00 |
16:06:41.93 |
-38:30:45.9 |
HIP 78881 |
29.17 |
| 2026-02-11 00:00 |
16:06:59.55 |
-38:33:36.5 |
HIP 79019 |
32.42 |
| 2026-02-11 12:00 |
16:07:17.01 |
-38:36:27.2 |
HIP 79009 |
29.82 |
| 2026-02-12 00:00 |
16:07:34.32 |
-38:39:18.1 |
HIP 79009 |
26.70 |
| 2026-02-12 12:00 |
16:07:51.47 |
-38:42:09.2 |
HIP 79009 |
23.97 |
| 2026-02-13 00:00 |
16:08:08.45 |
-38:45:00.3 |
HIP 79081 |
21.18 |
| 2026-02-13 12:00 |
16:08:25.28 |
-38:47:51.7 |
HIP 79081 |
17.80 |
| 2026-02-14 00:00 |
16:08:41.94 |
-38:50:43.1 |
HIP 79081 |
14.92 |
| 2026-02-14 12:00 |
16:08:58.44 |
-38:53:34.8 |
HIP 79081 |
12.85 |
| 2026-02-15 00:00 |
16:09:14.78 |
-38:56:26.5 |
HIP 79081 |
12.01 |
| 2026-02-15 12:00 |
16:09:30.94 |
-38:59:18.4 |
HIP 79081 |
12.61 |
| 2026-02-16 00:00 |
16:09:46.93 |
-39:02:10.4 |
HIP 79081 |
14.45 |
| 2026-02-16 12:00 |
16:10:02.76 |
-39:05:02.6 |
HIP 79081 |
17.12 |
| 2026-02-17 00:00 |
16:10:18.40 |
-39:07:54.9 |
HIP 79080 |
20.26 |
| 2026-02-17 12:00 |
16:10:33.88 |
-39:10:47.3 |
HIP 79080 |
23.62 |
| 2026-02-18 00:00 |
16:10:49.18 |
-39:13:39.8 |
HIP 79080 |
27.16 |
| 2026-02-18 12:00 |
16:11:04.30 |
-39:16:32.5 |
HIP 79495 |
26.31 |
| 2026-02-19 00:00 |
16:11:19.24 |
-39:19:25.2 |
HIP 79495 |
23.33 |
| 2026-02-19 12:00 |
16:11:34.00 |
-39:22:18.1 |
HIP 79495 |
20.77 |
| 2026-02-20 00:00 |
16:11:48.57 |
-39:25:11.2 |
HIP 79495 |
18.78 |
| 2026-02-20 12:00 |
16:12:02.97 |
-39:28:04.3 |
HIP 79495 |
17.55 |
| 2026-02-21 00:00 |
16:12:17.17 |
-39:30:57.5 |
HIP 79429 |
14.22 |
| 2026-02-21 12:00 |
16:12:31.19 |
-39:33:50.9 |
HIP 79429 |
10.79 |
| 2026-02-22 00:00 |
16:12:45.02 |
-39:36:44.3 |
HIP 79429 |
7.86 |
| 2026-02-22 12:00 |
16:12:58.66 |
-39:39:37.9 |
HIP 79429 |
6.15 |
| 2026-02-23 00:00 |
16:13:12.11 |
-39:42:31.5 |
HIP 79429 |
6.61 |
| 2026-02-23 12:00 |
16:13:25.37 |
-39:45:25.3 |
HIP 79429 |
8.89 |
| 2026-02-24 00:00 |
16:13:38.43 |
-39:48:19.1 |
HIP 79429 |
11.97 |