| 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) |
| 2026-07-29 00:00 |
14:52:28.39 |
-18:12:45.2 |
HIP 72702 |
12.28 |
| 2026-07-29 12:00 |
14:52:43.08 |
-18:13:18.0 |
HIP 72702 |
14.67 |
| 2026-07-30 00:00 |
14:52:57.98 |
-18:13:51.8 |
HIP 72876 |
12.55 |
| 2026-07-30 12:00 |
14:53:13.10 |
-18:14:26.7 |
HIP 72876 |
9.33 |
| 2026-07-31 00:00 |
14:53:28.44 |
-18:15:02.5 |
HIP 72876 |
6.53 |
| 2026-07-31 12:00 |
14:53:43.99 |
-18:15:39.4 |
HIP 72876 |
5.03 |
| 2026-08-01 00:00 |
14:53:59.75 |
-18:16:17.2 |
HIP 72876 |
6.02 |
| 2026-08-01 12:00 |
14:54:15.72 |
-18:16:56.0 |
HIP 72876 |
8.75 |
| 2026-08-02 00:00 |
14:54:31.90 |
-18:17:35.8 |
HIP 72876 |
12.15 |
| 2026-08-02 12:00 |
14:54:48.29 |
-18:18:16.5 |
HIP 73061 |
15.26 |
| 2026-08-03 00:00 |
14:55:04.89 |
-18:18:58.2 |
HIP 73061 |
11.27 |
| 2026-08-03 12:00 |
14:55:21.68 |
-18:19:40.9 |
HIP 73061 |
7.25 |
| 2026-08-04 00:00 |
14:55:38.69 |
-18:20:24.4 |
HIP 73061 |
3.26 |
| 2026-08-04 12:00 |
14:55:55.89 |
-18:21:08.9 |
HIP 73061 |
1.54 |
| 2026-08-05 00:00 |
14:56:13.30 |
-18:21:54.3 |
HIP 73061 |
5.39 |
| 2026-08-05 12:00 |
14:56:30.90 |
-18:22:40.5 |
HIP 73061 |
9.58 |
| 2026-08-06 00:00 |
14:56:48.70 |
-18:23:27.7 |
HIP 73061 |
13.86 |
| 2026-08-06 12:00 |
14:57:06.70 |
-18:24:15.8 |
HIP 73061 |
18.19 |
| 2026-08-07 00:00 |
14:57:24.89 |
-18:25:04.7 |
HIP 73061 |
22.58 |
| 2026-08-07 12:00 |
14:57:43.28 |
-18:25:54.5 |
HIP 73061 |
27.01 |
| 2026-08-08 00:00 |
14:58:01.86 |
-18:26:45.1 |
HIP 73061 |
31.49 |
| 2026-08-08 12:00 |
14:58:20.64 |
-18:27:36.6 |
HIP 73433 |
30.65 |
| 2026-08-09 00:00 |
14:58:39.60 |
-18:28:28.9 |
HIP 73433 |
26.12 |
| 2026-08-09 12:00 |
14:58:58.75 |
-18:29:22.0 |
HIP 73433 |
21.57 |
| 2026-08-10 00:00 |
14:59:18.09 |
-18:30:16.0 |
HIP 73433 |
17.02 |
| 2026-08-10 12:00 |
14:59:37.62 |
-18:31:10.7 |
HIP 73433 |
12.51 |
| 2026-08-11 00:00 |
14:59:57.33 |
-18:32:06.2 |
HIP 73433 |
8.19 |
| 2026-08-11 12:00 |
15:00:17.23 |
-18:33:02.6 |
HIP 73433 |
4.78 |
| 2026-08-12 00:00 |
15:00:37.31 |
-18:33:59.6 |
HIP 73433 |
5.00 |
| 2026-08-12 12:00 |
15:00:57.57 |
-18:34:57.5 |
HIP 73433 |
8.66 |
| 2026-08-13 00:00 |
15:01:18.01 |
-18:35:56.1 |
HIP 73514 |
12.64 |
| 2026-08-13 12:00 |
15:01:38.63 |
-18:36:55.4 |
HIP 73514 |
11.42 |
| 2026-08-14 00:00 |
15:01:59.43 |
-18:37:55.5 |
HIP 73514 |
12.28 |
| 2026-08-14 12:00 |
15:02:20.40 |
-18:38:56.3 |
HIP 73606 |
13.53 |
| 2026-08-15 00:00 |
15:02:41.55 |
-18:39:57.8 |
HIP 73606 |
13.31 |
| 2026-08-15 12:00 |
15:03:02.87 |
-18:41:00.0 |
HIP 73606 |
14.98 |
| 2026-08-16 00:00 |
15:03:24.36 |
-18:42:02.8 |
HIP 73606 |
18.05 |
| 2026-08-16 12:00 |
15:03:46.02 |
-18:43:06.4 |
HIP 73787 |
17.85 |
| 2026-08-17 00:00 |
15:04:07.85 |
-18:44:10.6 |
HIP 73787 |
14.01 |
| 2026-08-17 12:00 |
15:04:29.85 |
-18:45:15.4 |
HIP 73787 |
11.37 |
| 2026-08-18 00:00 |
15:04:52.01 |
-18:46:20.9 |
HIP 73787 |
10.92 |
| 2026-08-18 12:00 |
15:05:14.33 |
-18:47:27.1 |
HIP 73827 |
9.98 |
| 2026-08-19 00:00 |
15:05:36.82 |
-18:48:33.8 |
HIP 73827 |
11.72 |