| 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) |
| 2026-05-12 00:00 |
16:51:20.37 |
-11:42:08.8 |
HIP 82409 |
26.43 |
| 2026-05-12 12:00 |
16:51:18.76 |
-11:42:04.3 |
HIP 82409 |
26.17 |
| 2026-05-13 00:00 |
16:51:17.14 |
-11:41:59.7 |
HIP 82409 |
25.93 |
| 2026-05-13 12:00 |
16:51:15.52 |
-11:41:55.2 |
HIP 82409 |
25.68 |
| 2026-05-14 00:00 |
16:51:13.90 |
-11:41:50.8 |
HIP 82409 |
25.44 |
| 2026-05-14 12:00 |
16:51:12.27 |
-11:41:46.3 |
HIP 82409 |
25.20 |
| 2026-05-15 00:00 |
16:51:10.63 |
-11:41:41.9 |
HIP 82409 |
24.97 |
| 2026-05-15 12:00 |
16:51:08.99 |
-11:41:37.5 |
HIP 82409 |
24.74 |
| 2026-05-16 00:00 |
16:51:07.35 |
-11:41:33.2 |
HIP 82409 |
24.51 |
| 2026-05-16 12:00 |
16:51:05.70 |
-11:41:28.9 |
HIP 82409 |
24.29 |
| 2026-05-17 00:00 |
16:51:04.04 |
-11:41:24.6 |
HIP 82409 |
24.08 |
| 2026-05-17 12:00 |
16:51:02.38 |
-11:41:20.3 |
HIP 82409 |
23.87 |
| 2026-05-18 00:00 |
16:51:00.72 |
-11:41:16.1 |
HIP 82409 |
23.67 |
| 2026-05-18 12:00 |
16:50:59.05 |
-11:41:11.9 |
HIP 82409 |
23.47 |
| 2026-05-19 00:00 |
16:50:57.38 |
-11:41:07.7 |
HIP 82409 |
23.27 |
| 2026-05-19 12:00 |
16:50:55.70 |
-11:41:03.5 |
HIP 82409 |
23.09 |
| 2026-05-20 00:00 |
16:50:54.02 |
-11:40:59.4 |
HIP 82409 |
22.91 |
| 2026-05-20 12:00 |
16:50:52.33 |
-11:40:55.3 |
HIP 82409 |
22.73 |
| 2026-05-21 00:00 |
16:50:50.65 |
-11:40:51.3 |
HIP 82409 |
22.57 |
| 2026-05-21 12:00 |
16:50:48.95 |
-11:40:47.3 |
HIP 82409 |
22.41 |
| 2026-05-22 00:00 |
16:50:47.26 |
-11:40:43.3 |
HIP 82409 |
22.26 |
| 2026-05-22 12:00 |
16:50:45.56 |
-11:40:39.3 |
HIP 82409 |
22.11 |
| 2026-05-23 00:00 |
16:50:43.86 |
-11:40:35.4 |
HIP 82409 |
21.97 |
| 2026-05-23 12:00 |
16:50:42.16 |
-11:40:31.5 |
HIP 82409 |
21.84 |
| 2026-05-24 00:00 |
16:50:40.45 |
-11:40:27.6 |
HIP 82409 |
21.72 |
| 2026-05-24 12:00 |
16:50:38.74 |
-11:40:23.8 |
HIP 82409 |
21.61 |
| 2026-05-25 00:00 |
16:50:37.02 |
-11:40:20.0 |
HIP 82409 |
21.50 |
| 2026-05-25 12:00 |
16:50:35.31 |
-11:40:16.3 |
HIP 82409 |
21.40 |
| 2026-05-26 00:00 |
16:50:33.59 |
-11:40:12.5 |
HIP 82409 |
21.31 |
| 2026-05-26 12:00 |
16:50:31.87 |
-11:40:08.9 |
HIP 82409 |
21.23 |
| 2026-05-27 00:00 |
16:50:30.15 |
-11:40:05.2 |
HIP 82409 |
21.16 |
| 2026-05-27 12:00 |
16:50:28.43 |
-11:40:01.6 |
HIP 82409 |
21.10 |
| 2026-05-28 00:00 |
16:50:26.70 |
-11:39:58.0 |
HIP 82409 |
21.05 |
| 2026-05-28 12:00 |
16:50:24.97 |
-11:39:54.5 |
HIP 82409 |
21.00 |
| 2026-05-29 00:00 |
16:50:23.24 |
-11:39:50.9 |
HIP 82409 |
20.97 |
| 2026-05-29 12:00 |
16:50:21.51 |
-11:39:47.5 |
HIP 82409 |
20.94 |
| 2026-05-30 00:00 |
16:50:19.78 |
-11:39:44.0 |
HIP 82409 |
20.92 |
| 2026-05-30 12:00 |
16:50:18.04 |
-11:39:40.6 |
HIP 82409 |
20.92 |
| 2026-05-31 00:00 |
16:50:16.31 |
-11:39:37.2 |
HIP 82409 |
20.92 |
| 2026-05-31 12:00 |
16:50:14.57 |
-11:39:33.9 |
HIP 82409 |
20.93 |
| 2026-06-01 00:00 |
16:50:12.84 |
-11:39:30.6 |
HIP 82409 |
20.95 |
| 2026-06-01 12:00 |
16:50:11.10 |
-11:39:27.4 |
HIP 82409 |
20.98 |
| 2026-06-02 00:00 |
16:50:09.36 |
-11:39:24.1 |
HIP 82409 |
21.02 |