| Parameter |
Value |
| Designation |
60P/Tsuchinshan 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-11T05:33:44.340480Z |
| Orbit solution date (soln_date, UTC) |
2025-02-28T14:18:31Z |
| Obs used |
1247 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
23.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-10-02.0000000 |
| e |
0.53777177 |
| q (au) |
1.622648 |
| a (au) |
3.510492 |
| i (deg) |
3.606471 |
| Ω (om, deg) |
267.581419 |
| ω (w, deg) |
216.554593 |
| M (ma, deg) |
349.475881 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.813 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.813 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
14:55:31.86 |
-19:40:06.1 |
HIP 72994 |
21.60 |
| 2026-06-01 12:00 |
14:55:12.40 |
-19:38:03.0 |
HIP 72994 |
22.81 |
| 2026-06-02 00:00 |
14:54:53.24 |
-19:36:00.8 |
HIP 72994 |
24.96 |
| 2026-06-02 12:00 |
14:54:34.37 |
-19:33:59.6 |
HIP 72871 |
27.50 |
| 2026-06-03 00:00 |
14:54:15.79 |
-19:31:59.4 |
HIP 72865 |
24.94 |
| 2026-06-03 12:00 |
14:53:57.52 |
-19:30:00.2 |
HIP 72865 |
21.74 |
| 2026-06-04 00:00 |
14:53:39.54 |
-19:28:02.1 |
HIP 72865 |
19.21 |
| 2026-06-04 12:00 |
14:53:21.87 |
-19:26:05.1 |
HIP 72865 |
17.58 |
| 2026-06-05 00:00 |
14:53:04.51 |
-19:24:09.2 |
HIP 72865 |
17.07 |
| 2026-06-05 12:00 |
14:52:47.45 |
-19:22:14.4 |
HIP 72865 |
17.70 |
| 2026-06-06 00:00 |
14:52:30.70 |
-19:20:20.7 |
HIP 72865 |
19.32 |
| 2026-06-06 12:00 |
14:52:14.26 |
-19:18:28.2 |
HIP 72865 |
21.66 |
| 2026-06-07 00:00 |
14:51:58.13 |
-19:16:36.8 |
HIP 72645 |
24.29 |
| 2026-06-07 12:00 |
14:51:42.32 |
-19:14:46.7 |
HIP 72645 |
21.07 |
| 2026-06-08 00:00 |
14:51:26.82 |
-19:12:57.7 |
HIP 72645 |
18.26 |
| 2026-06-08 12:00 |
14:51:11.64 |
-19:11:10.0 |
HIP 72645 |
16.04 |
| 2026-06-09 00:00 |
14:50:56.78 |
-19:09:23.6 |
HIP 72645 |
14.62 |
| 2026-06-09 12:00 |
14:50:42.24 |
-19:07:38.4 |
HIP 72645 |
14.15 |
| 2026-06-10 00:00 |
14:50:28.02 |
-19:05:54.5 |
HIP 72525 |
14.44 |
| 2026-06-10 12:00 |
14:50:14.12 |
-19:04:11.9 |
HIP 72525 |
10.86 |
| 2026-06-11 00:00 |
14:50:00.54 |
-19:02:30.6 |
HIP 72525 |
7.47 |
| 2026-06-11 12:00 |
14:49:47.30 |
-19:00:50.7 |
HIP 72525 |
4.52 |
| 2026-06-12 00:00 |
14:49:34.37 |
-18:59:12.1 |
HIP 72525 |
3.17 |
| 2026-06-12 12:00 |
14:49:21.78 |
-18:57:34.8 |
HIP 72525 |
4.80 |
| 2026-06-13 00:00 |
14:49:09.51 |
-18:55:58.9 |
HIP 72525 |
7.61 |
| 2026-06-13 12:00 |
14:48:57.58 |
-18:54:24.5 |
HIP 72525 |
10.62 |
| 2026-06-14 00:00 |
14:48:45.97 |
-18:52:51.4 |
HIP 72525 |
13.66 |
| 2026-06-14 12:00 |
14:48:34.69 |
-18:51:19.7 |
HIP 72525 |
16.66 |
| 2026-06-15 00:00 |
14:48:23.75 |
-18:49:49.5 |
HIP 72525 |
19.60 |
| 2026-06-15 12:00 |
14:48:13.14 |
-18:48:20.7 |
HIP 72525 |
22.47 |
| 2026-06-16 00:00 |
14:48:02.86 |
-18:46:53.4 |
HIP 72319 |
20.35 |
| 2026-06-16 12:00 |
14:47:52.91 |
-18:45:27.5 |
HIP 72319 |
18.01 |
| 2026-06-17 00:00 |
14:47:43.30 |
-18:44:03.1 |
HIP 72319 |
15.86 |
| 2026-06-17 12:00 |
14:47:34.02 |
-18:42:40.1 |
HIP 72319 |
13.93 |
| 2026-06-18 00:00 |
14:47:25.07 |
-18:41:18.7 |
HIP 72319 |
12.27 |
| 2026-06-18 12:00 |
14:47:16.46 |
-18:39:58.7 |
HIP 72319 |
10.97 |
| 2026-06-19 00:00 |
14:47:08.18 |
-18:38:40.3 |
HIP 72319 |
10.10 |
| 2026-06-19 12:00 |
14:47:00.23 |
-18:37:23.3 |
HIP 72319 |
9.71 |
| 2026-06-20 00:00 |
14:46:52.62 |
-18:36:07.9 |
HIP 72319 |
9.81 |
| 2026-06-20 12:00 |
14:46:45.34 |
-18:34:53.9 |
HIP 72319 |
10.34 |
| 2026-06-21 00:00 |
14:46:38.39 |
-18:33:41.5 |
HIP 72319 |
11.19 |
| 2026-06-21 12:00 |
14:46:31.77 |
-18:32:30.6 |
HIP 72319 |
12.25 |
| 2026-06-22 00:00 |
14:46:25.47 |
-18:31:21.2 |
HIP 72319 |
13.45 |