62P/Tsuchinshan 1
| Parameter |
Value |
| Designation |
62P/Tsuchinshan 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-11-16T02:53:15.889920Z |
| Orbit solution date (soln_date, UTC) |
2025-03-14T14:47:38Z |
| Obs used |
3392 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-10-28.0000000 |
| e |
0.59747574 |
| q (au) |
1.383805 |
| a (au) |
3.437817 |
| i (deg) |
9.707775 |
| Ω (om, deg) |
90.244520 |
| ω (w, deg) |
30.348693 |
| M (ma, deg) |
357.043519 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.336 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.336 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.665 |
| k |
0.992 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-08-29 |
2024-06-04 |
+3.9132 |
-1.995 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:00:21.89 |
-24:43:42.7 |
HIP 93315 |
12.84 |
| 2026-02-03 12:00 |
19:00:47.17 |
-24:43:18.1 |
HIP 93315 |
14.18 |
| 2026-02-04 00:00 |
19:01:12.38 |
-24:42:53.5 |
HIP 93315 |
17.40 |
| 2026-02-04 12:00 |
19:01:37.51 |
-24:42:28.8 |
HIP 93498 |
14.10 |
| 2026-02-05 00:00 |
19:02:02.57 |
-24:42:04.0 |
HIP 93498 |
10.42 |
| 2026-02-05 12:00 |
19:02:27.55 |
-24:41:39.2 |
HIP 93498 |
9.13 |
| 2026-02-06 00:00 |
19:02:52.46 |
-24:41:14.3 |
HIP 93498 |
11.08 |
| 2026-02-06 12:00 |
19:03:17.29 |
-24:40:49.4 |
HIP 93498 |
15.03 |
| 2026-02-07 00:00 |
19:03:42.04 |
-24:40:24.4 |
HIP 93699 |
17.42 |
| 2026-02-07 12:00 |
19:04:06.70 |
-24:39:59.4 |
HIP 93723 |
12.10 |
| 2026-02-08 00:00 |
19:04:31.29 |
-24:39:34.3 |
HIP 93723 |
6.53 |
| 2026-02-08 12:00 |
19:04:55.80 |
-24:39:09.2 |
HIP 93723 |
1.28 |
| 2026-02-09 00:00 |
19:05:20.23 |
-24:38:44.1 |
HIP 93723 |
4.78 |
| 2026-02-09 12:00 |
19:05:44.57 |
-24:38:18.9 |
HIP 93723 |
10.28 |
| 2026-02-10 00:00 |
19:06:08.83 |
-24:37:53.7 |
HIP 93723 |
15.79 |
| 2026-02-10 12:00 |
19:06:33.00 |
-24:37:28.5 |
HIP 93901 |
11.23 |
| 2026-02-11 00:00 |
19:06:57.09 |
-24:37:03.2 |
HIP 93901 |
6.90 |
| 2026-02-11 12:00 |
19:07:21.10 |
-24:36:38.0 |
HIP 93901 |
5.40 |
| 2026-02-12 00:00 |
19:07:45.01 |
-24:36:12.7 |
HIP 93993 |
7.45 |
| 2026-02-12 12:00 |
19:08:08.84 |
-24:35:47.4 |
HIP 93993 |
3.88 |
| 2026-02-13 00:00 |
19:08:32.57 |
-24:35:22.2 |
HIP 93993 |
5.77 |
| 2026-02-13 12:00 |
19:08:56.22 |
-24:34:56.9 |
HIP 93993 |
10.48 |
| 2026-02-14 00:00 |
19:09:19.78 |
-24:34:31.6 |
HIP 93993 |
15.62 |
| 2026-02-14 12:00 |
19:09:43.24 |
-24:34:06.4 |
HIP 93993 |
20.85 |
| 2026-02-15 00:00 |
19:10:06.61 |
-24:33:41.1 |
HIP 94238 |
25.64 |
| 2026-02-15 12:00 |
19:10:29.89 |
-24:33:15.9 |
HIP 94238 |
23.20 |
| 2026-02-16 00:00 |
19:10:53.07 |
-24:32:50.7 |
HIP 94238 |
21.81 |
| 2026-02-16 12:00 |
19:11:16.15 |
-24:32:25.5 |
HIP 94397 |
20.58 |
| 2026-02-17 00:00 |
19:11:39.14 |
-24:32:00.4 |
HIP 94397 |
15.35 |
| 2026-02-17 12:00 |
19:12:02.03 |
-24:31:35.3 |
HIP 94397 |
10.17 |
| 2026-02-18 00:00 |
19:12:24.82 |
-24:31:10.2 |
HIP 94397 |
5.09 |
| 2026-02-18 12:00 |
19:12:47.51 |
-24:30:45.2 |
HIP 94397 |
1.59 |
| 2026-02-19 00:00 |
19:13:10.11 |
-24:30:20.3 |
HIP 94397 |
5.70 |
| 2026-02-19 12:00 |
19:13:32.59 |
-24:29:55.4 |
HIP 94397 |
10.73 |
| 2026-02-20 00:00 |
19:13:54.98 |
-24:29:30.5 |
HIP 94397 |
15.81 |
| 2026-02-20 12:00 |
19:14:17.27 |
-24:29:05.8 |
HIP 94397 |
20.87 |
| 2026-02-21 00:00 |
19:14:39.44 |
-24:28:41.1 |
HIP 94645 |
21.71 |
| 2026-02-21 12:00 |
19:15:01.52 |
-24:28:16.4 |
HIP 94645 |
18.95 |
| 2026-02-22 00:00 |
19:15:23.49 |
-24:27:51.9 |
HIP 94645 |
17.26 |
| 2026-02-22 12:00 |
19:15:45.35 |
-24:27:27.4 |
HIP 94690 |
16.08 |
| 2026-02-23 00:00 |
19:16:07.10 |
-24:27:03.0 |
HIP 94690 |
16.01 |
| 2026-02-23 12:00 |
19:16:28.74 |
-24:26:38.7 |
HIP 94690 |
17.41 |
| 2026-02-24 00:00 |
19:16:50.28 |
-24:26:14.5 |
HIP 94690 |
19.95 |