C/1977 V1 (Tsuchinshan)
| Parameter |
Value |
| Designation |
C/1977 V1 (Tsuchinshan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1977-07-24T20:21:58.737600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
69 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
10.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1978-01-05.0000000 |
| e |
0.99939607 |
| q (au) |
3.603189 |
| a (au) |
5966.223621 |
| i (deg) |
168.548706 |
| Ω (om, deg) |
5.287760 |
| ω (w, deg) |
318.178421 |
| M (ma, deg) |
0.000351 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.775 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.775 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.699 |
| k |
0.802 |
| δ90 |
9.864 |
| 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 |
| 1977-11-08 |
1978-10-31 |
+17.3547 |
-10.143 |
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 |
16:53:01.23 |
-11:57:34.0 |
HIP 82638 |
14.91 |
| 2026-02-03 12:00 |
16:53:02.04 |
-11:57:31.5 |
HIP 82638 |
14.76 |
| 2026-02-04 00:00 |
16:53:02.84 |
-11:57:28.9 |
HIP 82638 |
14.63 |
| 2026-02-04 12:00 |
16:53:03.62 |
-11:57:26.2 |
HIP 82638 |
14.49 |
| 2026-02-05 00:00 |
16:53:04.39 |
-11:57:23.6 |
HIP 82638 |
14.35 |
| 2026-02-05 12:00 |
16:53:05.15 |
-11:57:20.9 |
HIP 82638 |
14.22 |
| 2026-02-06 00:00 |
16:53:05.89 |
-11:57:18.1 |
HIP 82638 |
14.09 |
| 2026-02-06 12:00 |
16:53:06.63 |
-11:57:15.3 |
HIP 82638 |
13.97 |
| 2026-02-07 00:00 |
16:53:07.34 |
-11:57:12.5 |
HIP 82638 |
13.84 |
| 2026-02-07 12:00 |
16:53:08.05 |
-11:57:09.6 |
HIP 82638 |
13.72 |
| 2026-02-08 00:00 |
16:53:08.74 |
-11:57:06.7 |
HIP 82638 |
13.60 |
| 2026-02-08 12:00 |
16:53:09.42 |
-11:57:03.7 |
HIP 82638 |
13.48 |
| 2026-02-09 00:00 |
16:53:10.09 |
-11:57:00.7 |
HIP 82638 |
13.36 |
| 2026-02-09 12:00 |
16:53:10.74 |
-11:56:57.7 |
HIP 82638 |
13.25 |
| 2026-02-10 00:00 |
16:53:11.38 |
-11:56:54.6 |
HIP 82638 |
13.14 |
| 2026-02-10 12:00 |
16:53:12.01 |
-11:56:51.5 |
HIP 82638 |
13.02 |
| 2026-02-11 00:00 |
16:53:12.62 |
-11:56:48.3 |
HIP 82638 |
12.92 |
| 2026-02-11 12:00 |
16:53:13.22 |
-11:56:45.1 |
HIP 82638 |
12.81 |
| 2026-02-12 00:00 |
16:53:13.81 |
-11:56:41.9 |
HIP 82638 |
12.70 |
| 2026-02-12 12:00 |
16:53:14.38 |
-11:56:38.6 |
HIP 82638 |
12.60 |
| 2026-02-13 00:00 |
16:53:14.94 |
-11:56:35.3 |
HIP 82638 |
12.50 |
| 2026-02-13 12:00 |
16:53:15.48 |
-11:56:31.9 |
HIP 82638 |
12.40 |
| 2026-02-14 00:00 |
16:53:16.01 |
-11:56:28.5 |
HIP 82638 |
12.30 |
| 2026-02-14 12:00 |
16:53:16.53 |
-11:56:25.1 |
HIP 82638 |
12.20 |
| 2026-02-15 00:00 |
16:53:17.03 |
-11:56:21.7 |
HIP 82638 |
12.10 |
| 2026-02-15 12:00 |
16:53:17.52 |
-11:56:18.2 |
HIP 82638 |
12.01 |
| 2026-02-16 00:00 |
16:53:17.99 |
-11:56:14.6 |
HIP 82638 |
11.91 |
| 2026-02-16 12:00 |
16:53:18.46 |
-11:56:11.0 |
HIP 82638 |
11.82 |
| 2026-02-17 00:00 |
16:53:18.90 |
-11:56:07.4 |
HIP 82638 |
11.73 |
| 2026-02-17 12:00 |
16:53:19.33 |
-11:56:03.8 |
HIP 82638 |
11.64 |
| 2026-02-18 00:00 |
16:53:19.75 |
-11:56:00.1 |
HIP 82638 |
11.55 |
| 2026-02-18 12:00 |
16:53:20.16 |
-11:55:56.4 |
HIP 82638 |
11.46 |
| 2026-02-19 00:00 |
16:53:20.55 |
-11:55:52.6 |
HIP 82638 |
11.37 |
| 2026-02-19 12:00 |
16:53:20.92 |
-11:55:48.8 |
HIP 82638 |
11.29 |
| 2026-02-20 00:00 |
16:53:21.28 |
-11:55:45.0 |
HIP 82638 |
11.20 |
| 2026-02-20 12:00 |
16:53:21.63 |
-11:55:41.1 |
HIP 82638 |
11.11 |
| 2026-02-21 00:00 |
16:53:21.96 |
-11:55:37.2 |
HIP 82638 |
11.03 |
| 2026-02-21 12:00 |
16:53:22.28 |
-11:55:33.3 |
HIP 82638 |
10.95 |
| 2026-02-22 00:00 |
16:53:22.58 |
-11:55:29.4 |
HIP 82638 |
10.86 |
| 2026-02-22 12:00 |
16:53:22.87 |
-11:55:25.4 |
HIP 82638 |
10.78 |
| 2026-02-23 00:00 |
16:53:23.14 |
-11:55:21.3 |
HIP 82638 |
10.70 |
| 2026-02-23 12:00 |
16:53:23.40 |
-11:55:17.3 |
HIP 82638 |
10.62 |
| 2026-02-24 00:00 |
16:53:23.65 |
-11:55:13.2 |
HIP 82638 |
10.54 |