| Parameter |
Value |
| Designation |
C/1980 O1 (Cernis-Petrauskas) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1980-06-22T10:43:23.995200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1980-08-29.0000000 |
| e |
1.00000000 |
| q (au) |
0.522897 |
| a (au) |
- |
| i (deg) |
49.068235 |
| Ω (om, deg) |
160.632533 |
| ω (w, deg) |
337.783670 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (7.470 + 3.779\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.470 |
| n |
3.779 |
| gf |
0.800 |
| gb |
-0.765 |
| k |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:57:51.23 |
+07:28:14.1 |
HIP 103552 |
27.42 |
| 2026-05-12 12:00 |
20:57:51.02 |
+07:28:23.2 |
HIP 103552 |
27.57 |
| 2026-05-13 00:00 |
20:57:50.79 |
+07:28:32.2 |
HIP 103552 |
27.73 |
| 2026-05-13 12:00 |
20:57:50.54 |
+07:28:41.2 |
HIP 103552 |
27.89 |
| 2026-05-14 00:00 |
20:57:50.29 |
+07:28:50.1 |
HIP 103552 |
28.05 |
| 2026-05-14 12:00 |
20:57:50.02 |
+07:28:58.9 |
HIP 103552 |
28.21 |
| 2026-05-15 00:00 |
20:57:49.74 |
+07:29:07.7 |
HIP 103552 |
28.37 |
| 2026-05-15 12:00 |
20:57:49.44 |
+07:29:16.4 |
HIP 103552 |
28.54 |
| 2026-05-16 00:00 |
20:57:49.13 |
+07:29:25.0 |
HIP 103552 |
28.70 |
| 2026-05-16 12:00 |
20:57:48.81 |
+07:29:33.6 |
HIP 103552 |
28.86 |
| 2026-05-17 00:00 |
20:57:48.47 |
+07:29:42.1 |
HIP 103552 |
29.03 |
| 2026-05-17 12:00 |
20:57:48.12 |
+07:29:50.5 |
HIP 103552 |
29.19 |
| 2026-05-18 00:00 |
20:57:47.76 |
+07:29:58.8 |
HIP 103552 |
29.36 |
| 2026-05-18 12:00 |
20:57:47.38 |
+07:30:07.1 |
HIP 103552 |
29.52 |
| 2026-05-19 00:00 |
20:57:46.99 |
+07:30:15.3 |
HIP 103552 |
29.69 |
| 2026-05-19 12:00 |
20:57:46.59 |
+07:30:23.4 |
HIP 103552 |
29.86 |
| 2026-05-20 00:00 |
20:57:46.17 |
+07:30:31.5 |
HIP 103552 |
30.03 |
| 2026-05-20 12:00 |
20:57:45.74 |
+07:30:39.4 |
HIP 103552 |
30.19 |
| 2026-05-21 00:00 |
20:57:45.30 |
+07:30:47.3 |
HIP 103552 |
30.36 |
| 2026-05-21 12:00 |
20:57:44.84 |
+07:30:55.2 |
HIP 103552 |
30.53 |
| 2026-05-22 00:00 |
20:57:44.38 |
+07:31:02.9 |
HIP 103309 |
30.41 |
| 2026-05-22 12:00 |
20:57:43.90 |
+07:31:10.6 |
HIP 103309 |
30.26 |
| 2026-05-23 00:00 |
20:57:43.40 |
+07:31:18.2 |
HIP 103309 |
30.10 |
| 2026-05-23 12:00 |
20:57:42.90 |
+07:31:25.7 |
HIP 103309 |
29.95 |
| 2026-05-24 00:00 |
20:57:42.38 |
+07:31:33.1 |
HIP 103309 |
29.79 |
| 2026-05-24 12:00 |
20:57:41.84 |
+07:31:40.5 |
HIP 103309 |
29.63 |
| 2026-05-25 00:00 |
20:57:41.30 |
+07:31:47.7 |
HIP 103309 |
29.46 |
| 2026-05-25 12:00 |
20:57:40.74 |
+07:31:54.9 |
HIP 103309 |
29.30 |
| 2026-05-26 00:00 |
20:57:40.17 |
+07:32:02.0 |
HIP 103309 |
29.13 |
| 2026-05-26 12:00 |
20:57:39.59 |
+07:32:09.1 |
HIP 103309 |
28.96 |
| 2026-05-27 00:00 |
20:57:38.99 |
+07:32:16.0 |
HIP 103309 |
28.78 |
| 2026-05-27 12:00 |
20:57:38.38 |
+07:32:22.9 |
HIP 103309 |
28.61 |
| 2026-05-28 00:00 |
20:57:37.76 |
+07:32:29.7 |
HIP 103309 |
28.43 |
| 2026-05-28 12:00 |
20:57:37.13 |
+07:32:36.4 |
HIP 103309 |
28.25 |
| 2026-05-29 00:00 |
20:57:36.49 |
+07:32:43.0 |
HIP 103309 |
28.07 |
| 2026-05-29 12:00 |
20:57:35.83 |
+07:32:49.5 |
HIP 103309 |
27.88 |
| 2026-05-30 00:00 |
20:57:35.16 |
+07:32:56.0 |
HIP 103309 |
27.69 |
| 2026-05-30 12:00 |
20:57:34.48 |
+07:33:02.3 |
HIP 103309 |
27.50 |
| 2026-05-31 00:00 |
20:57:33.79 |
+07:33:08.6 |
HIP 103309 |
27.31 |
| 2026-05-31 12:00 |
20:57:33.08 |
+07:33:14.8 |
HIP 103309 |
27.12 |
| 2026-06-01 00:00 |
20:57:32.36 |
+07:33:20.9 |
HIP 103309 |
26.92 |
| 2026-06-01 12:00 |
20:57:31.63 |
+07:33:26.9 |
HIP 103309 |
26.72 |
| 2026-06-02 00:00 |
20:57:30.89 |
+07:33:32.8 |
HIP 103309 |
26.52 |