| Parameter |
Value |
| Designation |
C/2026 C1 (Tsuchinshan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-11-07T01:56:20.394240Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:31Z |
| Obs used |
498 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
7.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-02-11T19:49:29.596800Z |
| Discovery magnitude (MPC) |
19.30 R |
| Discovery observatory (MPC) |
D29 · Purple Mountain Observatory, XuYi Station |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-03-08.0000000 |
| e |
0.99985076 |
| q (au) |
1.152501 |
| a (au) |
7722.582345 |
| i (deg) |
99.601120 |
| Ω (om, deg) |
3.618060 |
| ω (w, deg) |
310.723009 |
| M (ma, deg) |
359.998584 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.777 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.777 |
| n |
6.000 |
| gf |
0.977 |
| gb |
-0.885 |
| k |
0.855 |
| δ90 |
5.929 |
| 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 |
12:34:21.09 |
+06:55:20.0 |
HIP 61298 |
24.37 |
| 2026-03-26 12:00 |
12:34:07.34 |
+06:56:16.8 |
HIP 61298 |
22.09 |
| 2026-03-27 00:00 |
12:33:53.57 |
+06:57:13.3 |
HIP 61298 |
20.17 |
| 2026-03-27 12:00 |
12:33:39.78 |
+06:58:09.5 |
HIP 61298 |
18.73 |
| 2026-03-28 00:00 |
12:33:25.98 |
+06:59:05.5 |
HIP 61298 |
17.90 |
| 2026-03-28 12:00 |
12:33:12.16 |
+07:00:01.1 |
HIP 61298 |
17.76 |
| 2026-03-29 00:00 |
12:32:58.33 |
+07:00:56.5 |
HIP 61298 |
18.33 |
| 2026-03-29 12:00 |
12:32:44.48 |
+07:01:51.6 |
HIP 61298 |
19.54 |
| 2026-03-30 00:00 |
12:32:30.62 |
+07:02:46.4 |
HIP 61298 |
21.29 |
| 2026-03-30 12:00 |
12:32:16.75 |
+07:03:40.9 |
HIP 61298 |
23.45 |
| 2026-03-31 00:00 |
12:32:02.87 |
+07:04:35.0 |
HIP 61298 |
25.93 |
| 2026-03-31 12:00 |
12:31:48.98 |
+07:05:28.9 |
HIP 61298 |
28.65 |
| 2026-04-01 00:00 |
12:31:35.09 |
+07:06:22.4 |
HIP 61103 |
30.08 |
| 2026-04-01 12:00 |
12:31:21.19 |
+07:07:15.5 |
HIP 61103 |
29.00 |
| 2026-04-02 00:00 |
12:31:07.29 |
+07:08:08.4 |
HIP 61103 |
28.34 |
| 2026-04-02 12:00 |
12:30:53.38 |
+07:09:00.8 |
HIP 61103 |
28.12 |
| 2026-04-03 00:00 |
12:30:39.47 |
+07:09:52.9 |
HIP 61103 |
28.35 |
| 2026-04-03 12:00 |
12:30:25.56 |
+07:10:44.7 |
HIP 60916 |
27.43 |
| 2026-04-04 00:00 |
12:30:11.65 |
+07:11:36.0 |
HIP 60916 |
25.69 |
| 2026-04-04 12:00 |
12:29:57.75 |
+07:12:27.0 |
HIP 60916 |
24.33 |
| 2026-04-05 00:00 |
12:29:43.84 |
+07:13:17.6 |
HIP 60916 |
23.44 |
| 2026-04-05 12:00 |
12:29:29.94 |
+07:14:07.8 |
HIP 60916 |
23.05 |
| 2026-04-06 00:00 |
12:29:16.05 |
+07:14:57.6 |
HIP 60916 |
23.20 |
| 2026-04-06 12:00 |
12:29:02.16 |
+07:15:47.0 |
HIP 60916 |
23.88 |
| 2026-04-07 00:00 |
12:28:48.29 |
+07:16:36.0 |
HIP 60772 |
21.64 |
| 2026-04-07 12:00 |
12:28:34.42 |
+07:17:24.5 |
HIP 60772 |
18.11 |
| 2026-04-08 00:00 |
12:28:20.56 |
+07:18:12.7 |
HIP 60772 |
14.60 |
| 2026-04-08 12:00 |
12:28:06.71 |
+07:19:00.3 |
HIP 60772 |
11.10 |
| 2026-04-09 00:00 |
12:27:52.88 |
+07:19:47.6 |
HIP 60772 |
7.63 |
| 2026-04-09 12:00 |
12:27:39.06 |
+07:20:34.4 |
HIP 60772 |
4.26 |
| 2026-04-10 00:00 |
12:27:25.26 |
+07:21:20.7 |
HIP 60772 |
1.64 |
| 2026-04-10 12:00 |
12:27:11.48 |
+07:22:06.6 |
HIP 60772 |
3.45 |
| 2026-04-11 00:00 |
12:26:57.71 |
+07:22:52.0 |
HIP 60772 |
6.75 |
| 2026-04-11 12:00 |
12:26:43.97 |
+07:23:37.0 |
HIP 60772 |
10.17 |
| 2026-04-12 00:00 |
12:26:30.24 |
+07:24:21.4 |
HIP 60772 |
13.62 |
| 2026-04-12 12:00 |
12:26:16.54 |
+07:25:05.4 |
HIP 60772 |
17.08 |
| 2026-04-13 00:00 |
12:26:02.86 |
+07:25:48.9 |
HIP 60772 |
20.54 |
| 2026-04-13 12:00 |
12:25:49.21 |
+07:26:31.8 |
HIP 60772 |
23.99 |
| 2026-04-14 00:00 |
12:25:35.58 |
+07:27:14.3 |
HIP 60772 |
27.44 |
| 2026-04-14 12:00 |
12:25:21.98 |
+07:27:56.2 |
HIP 60772 |
30.88 |
| 2026-04-15 00:00 |
12:25:08.41 |
+07:28:37.6 |
HIP 60714 |
32.69 |
| 2026-04-15 12:00 |
12:24:54.87 |
+07:29:18.5 |
HIP 60714 |
34.46 |
| 2026-04-16 00:00 |
12:24:41.36 |
+07:29:58.9 |
HIP 60714 |
36.47 |