| Parameter |
Value |
| Designation |
C/2026 C1 (Tsuchinshan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-11-06T23:47:05.916480Z |
| Orbit solution date (soln_date, UTC) |
2026-07-16T19:12:18Z |
| Obs used |
918 |
| NEO |
- |
| M1 |
6.300 |
| 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) |
2026-04-06.0000000 |
| e |
0.99990517 |
| q (au) |
1.152465 |
| a (au) |
12153.033740 |
| i (deg) |
99.595326 |
| Ω (om, deg) |
3.618978 |
| ω (w, deg) |
310.719450 |
| M (ma, deg) |
359.999304 |
Magnitude
Scatter + Global Linear
$$
M_a = (-1.789 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-1.789 |
| n |
6.000 |
| gf |
0.987 |
| gb |
-0.721 |
| k |
1.000 |
| δ90 |
9.998 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
12:07:21.03 |
+05:56:16.7 |
HIP 59080 |
10.11 |
| 2026-07-29 12:00 |
12:07:25.82 |
+05:54:51.4 |
HIP 59080 |
9.87 |
| 2026-07-30 00:00 |
12:07:30.68 |
+05:53:25.7 |
HIP 59080 |
9.99 |
| 2026-07-30 12:00 |
12:07:35.62 |
+05:51:59.7 |
HIP 59080 |
10.46 |
| 2026-07-31 00:00 |
12:07:40.64 |
+05:50:33.3 |
HIP 59080 |
11.25 |
| 2026-07-31 12:00 |
12:07:45.74 |
+05:49:06.5 |
HIP 59080 |
12.31 |
| 2026-08-01 00:00 |
12:07:50.91 |
+05:47:39.4 |
HIP 59080 |
13.58 |
| 2026-08-01 12:00 |
12:07:56.15 |
+05:46:12.0 |
HIP 59080 |
15.01 |
| 2026-08-02 00:00 |
12:08:01.47 |
+05:44:44.2 |
HIP 59080 |
16.57 |
| 2026-08-02 12:00 |
12:08:06.87 |
+05:43:16.0 |
HIP 59080 |
18.23 |
| 2026-08-03 00:00 |
12:08:12.34 |
+05:41:47.6 |
HIP 59080 |
19.97 |
| 2026-08-03 12:00 |
12:08:17.88 |
+05:40:18.8 |
HIP 59080 |
21.77 |
| 2026-08-04 00:00 |
12:08:23.49 |
+05:38:49.6 |
HIP 59080 |
23.63 |
| 2026-08-04 12:00 |
12:08:29.18 |
+05:37:20.1 |
HIP 59301 |
24.46 |
| 2026-08-05 00:00 |
12:08:34.94 |
+05:35:50.3 |
HIP 59301 |
22.55 |
| 2026-08-05 12:00 |
12:08:40.77 |
+05:34:20.2 |
HIP 59301 |
20.65 |
| 2026-08-06 00:00 |
12:08:46.67 |
+05:32:49.7 |
HIP 59301 |
18.78 |
| 2026-08-06 12:00 |
12:08:52.64 |
+05:31:19.0 |
HIP 59301 |
16.95 |
| 2026-08-07 00:00 |
12:08:58.68 |
+05:29:47.9 |
HIP 59301 |
15.16 |
| 2026-08-07 12:00 |
12:09:04.80 |
+05:28:16.4 |
HIP 59301 |
13.47 |
| 2026-08-08 00:00 |
12:09:10.98 |
+05:26:44.7 |
HIP 59301 |
11.91 |
| 2026-08-08 12:00 |
12:09:17.23 |
+05:25:12.7 |
HIP 59301 |
10.55 |
| 2026-08-09 00:00 |
12:09:23.55 |
+05:23:40.4 |
HIP 59301 |
9.48 |
| 2026-08-09 12:00 |
12:09:29.94 |
+05:22:07.7 |
HIP 59301 |
8.84 |
| 2026-08-10 00:00 |
12:09:36.39 |
+05:20:34.8 |
HIP 59301 |
8.72 |
| 2026-08-10 12:00 |
12:09:42.92 |
+05:19:01.6 |
HIP 59301 |
9.15 |
| 2026-08-11 00:00 |
12:09:49.51 |
+05:17:28.0 |
HIP 59301 |
10.08 |
| 2026-08-11 12:00 |
12:09:56.16 |
+05:15:54.2 |
HIP 59301 |
11.40 |
| 2026-08-12 00:00 |
12:10:02.88 |
+05:14:20.1 |
HIP 59301 |
12.99 |
| 2026-08-12 12:00 |
12:10:09.67 |
+05:12:45.8 |
HIP 59301 |
14.77 |
| 2026-08-13 00:00 |
12:10:16.52 |
+05:11:11.1 |
HIP 59301 |
16.69 |
| 2026-08-13 12:00 |
12:10:23.43 |
+05:09:36.2 |
HIP 59301 |
18.71 |
| 2026-08-14 00:00 |
12:10:30.41 |
+05:08:01.0 |
HIP 59301 |
20.81 |
| 2026-08-14 12:00 |
12:10:37.45 |
+05:06:25.5 |
HIP 59301 |
22.97 |
| 2026-08-15 00:00 |
12:10:44.55 |
+05:04:49.8 |
HIP 59479 |
24.17 |
| 2026-08-15 12:00 |
12:10:51.71 |
+05:03:13.8 |
HIP 59479 |
23.96 |
| 2026-08-16 00:00 |
12:10:58.93 |
+05:01:37.6 |
HIP 59479 |
23.99 |
| 2026-08-16 12:00 |
12:11:06.22 |
+05:00:01.1 |
HIP 59479 |
24.26 |
| 2026-08-17 00:00 |
12:11:13.56 |
+04:58:24.4 |
HIP 59479 |
24.75 |
| 2026-08-17 12:00 |
12:11:20.96 |
+04:56:47.4 |
HIP 59479 |
25.47 |
| 2026-08-18 00:00 |
12:11:28.43 |
+04:55:10.2 |
HIP 59479 |
26.40 |
| 2026-08-18 12:00 |
12:11:35.95 |
+04:53:32.8 |
HIP 59479 |
27.52 |
| 2026-08-19 00:00 |
12:11:43.52 |
+04:51:55.1 |
HIP 59479 |
28.81 |