| 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 |
-0.501 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
20:57:30.14 |
+07:33:38.7 |
HIP 103309 |
26.31 |
| 2026-06-03 00:00 |
20:57:29.37 |
+07:33:44.4 |
HIP 103309 |
26.10 |
| 2026-06-03 12:00 |
20:57:28.59 |
+07:33:50.1 |
HIP 103309 |
25.89 |
| 2026-06-04 00:00 |
20:57:27.80 |
+07:33:55.7 |
HIP 103309 |
25.68 |
| 2026-06-04 12:00 |
20:57:27.00 |
+07:34:01.2 |
HIP 103309 |
25.47 |
| 2026-06-05 00:00 |
20:57:26.19 |
+07:34:06.6 |
HIP 103309 |
25.25 |
| 2026-06-05 12:00 |
20:57:25.37 |
+07:34:11.9 |
HIP 103309 |
25.03 |
| 2026-06-06 00:00 |
20:57:24.53 |
+07:34:17.1 |
HIP 103309 |
24.81 |
| 2026-06-06 12:00 |
20:57:23.69 |
+07:34:22.2 |
HIP 103309 |
24.59 |
| 2026-06-07 00:00 |
20:57:22.83 |
+07:34:27.3 |
HIP 103309 |
24.36 |
| 2026-06-07 12:00 |
20:57:21.96 |
+07:34:32.2 |
HIP 103309 |
24.13 |
| 2026-06-08 00:00 |
20:57:21.08 |
+07:34:37.1 |
HIP 103309 |
23.90 |
| 2026-06-08 12:00 |
20:57:20.18 |
+07:34:41.8 |
HIP 103309 |
23.67 |
| 2026-06-09 00:00 |
20:57:19.28 |
+07:34:46.5 |
HIP 103309 |
23.43 |
| 2026-06-09 12:00 |
20:57:18.37 |
+07:34:51.1 |
HIP 103309 |
23.19 |
| 2026-06-10 00:00 |
20:57:17.44 |
+07:34:55.6 |
HIP 103309 |
22.95 |
| 2026-06-10 12:00 |
20:57:16.50 |
+07:35:00.0 |
HIP 103309 |
22.71 |
| 2026-06-11 00:00 |
20:57:15.56 |
+07:35:04.2 |
HIP 103309 |
22.47 |
| 2026-06-11 12:00 |
20:57:14.60 |
+07:35:08.4 |
HIP 103309 |
22.22 |
| 2026-06-12 00:00 |
20:57:13.63 |
+07:35:12.5 |
HIP 103309 |
21.97 |
| 2026-06-12 12:00 |
20:57:12.65 |
+07:35:16.5 |
HIP 103309 |
21.72 |
| 2026-06-13 00:00 |
20:57:11.66 |
+07:35:20.4 |
HIP 103309 |
21.46 |
| 2026-06-13 12:00 |
20:57:10.66 |
+07:35:24.3 |
HIP 103309 |
21.21 |
| 2026-06-14 00:00 |
20:57:09.65 |
+07:35:28.0 |
HIP 103309 |
20.95 |
| 2026-06-14 12:00 |
20:57:08.62 |
+07:35:31.6 |
HIP 103309 |
20.69 |
| 2026-06-15 00:00 |
20:57:07.59 |
+07:35:35.1 |
HIP 103309 |
20.43 |
| 2026-06-15 12:00 |
20:57:06.55 |
+07:35:38.5 |
HIP 103309 |
20.16 |
| 2026-06-16 00:00 |
20:57:05.49 |
+07:35:41.8 |
HIP 103309 |
19.90 |
| 2026-06-16 12:00 |
20:57:04.43 |
+07:35:45.1 |
HIP 103309 |
19.63 |
| 2026-06-17 00:00 |
20:57:03.36 |
+07:35:48.2 |
HIP 103309 |
19.36 |
| 2026-06-17 12:00 |
20:57:02.27 |
+07:35:51.2 |
HIP 103309 |
19.08 |
| 2026-06-18 00:00 |
20:57:01.18 |
+07:35:54.1 |
HIP 103309 |
18.81 |
| 2026-06-18 12:00 |
20:57:00.08 |
+07:35:57.0 |
HIP 103309 |
18.53 |
| 2026-06-19 00:00 |
20:56:58.96 |
+07:35:59.7 |
HIP 103309 |
18.25 |
| 2026-06-19 12:00 |
20:56:57.84 |
+07:36:02.3 |
HIP 103309 |
17.97 |
| 2026-06-20 00:00 |
20:56:56.71 |
+07:36:04.8 |
HIP 103309 |
17.69 |
| 2026-06-20 12:00 |
20:56:55.57 |
+07:36:07.3 |
HIP 103309 |
17.40 |
| 2026-06-21 00:00 |
20:56:54.42 |
+07:36:09.6 |
HIP 103309 |
17.12 |
| 2026-06-21 12:00 |
20:56:53.26 |
+07:36:11.8 |
HIP 103309 |
16.83 |
| 2026-06-22 00:00 |
20:56:52.09 |
+07:36:13.9 |
HIP 103309 |
16.54 |