| Parameter |
Value |
| Designation |
C/1980 V1 (Meier) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1980-12-09T15:31:46.606080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
61 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
10.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1981-01-14.0000000 |
| e |
0.99459747 |
| q (au) |
1.519494 |
| a (au) |
281.256043 |
| i (deg) |
100.985508 |
| Ω (om, deg) |
25.436876 |
| ω (w, deg) |
87.964495 |
| M (ma, deg) |
0.007387 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.541 + 3.275\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.541 |
| n |
3.275 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-03-26 00:00 |
08:43:53.71 |
-57:53:06.3 |
HIP 42885 |
8.03 |
| 2026-03-26 12:00 |
08:43:51.84 |
-57:52:44.3 |
HIP 42885 |
7.85 |
| 2026-03-27 00:00 |
08:43:50.00 |
-57:52:22.2 |
HIP 42885 |
7.69 |
| 2026-03-27 12:00 |
08:43:48.17 |
-57:52:00.0 |
HIP 42885 |
7.54 |
| 2026-03-28 00:00 |
08:43:46.38 |
-57:51:37.7 |
HIP 42885 |
7.42 |
| 2026-03-28 12:00 |
08:43:44.60 |
-57:51:15.3 |
HIP 42885 |
7.31 |
| 2026-03-29 00:00 |
08:43:42.85 |
-57:50:52.8 |
HIP 42885 |
7.23 |
| 2026-03-29 12:00 |
08:43:41.13 |
-57:50:30.2 |
HIP 42885 |
7.17 |
| 2026-03-30 00:00 |
08:43:39.43 |
-57:50:07.5 |
HIP 42885 |
7.14 |
| 2026-03-30 12:00 |
08:43:37.75 |
-57:49:44.7 |
HIP 42885 |
7.13 |
| 2026-03-31 00:00 |
08:43:36.10 |
-57:49:21.8 |
HIP 42885 |
7.14 |
| 2026-03-31 12:00 |
08:43:34.47 |
-57:48:58.8 |
HIP 42885 |
7.18 |
| 2026-04-01 00:00 |
08:43:32.87 |
-57:48:35.8 |
HIP 42885 |
7.23 |
| 2026-04-01 12:00 |
08:43:31.29 |
-57:48:12.6 |
HIP 42885 |
7.32 |
| 2026-04-02 00:00 |
08:43:29.74 |
-57:47:49.4 |
HIP 42885 |
7.42 |
| 2026-04-02 12:00 |
08:43:28.21 |
-57:47:26.0 |
HIP 42885 |
7.54 |
| 2026-04-03 00:00 |
08:43:26.71 |
-57:47:02.6 |
HIP 42885 |
7.69 |
| 2026-04-03 12:00 |
08:43:25.23 |
-57:46:39.1 |
HIP 42885 |
7.85 |
| 2026-04-04 00:00 |
08:43:23.78 |
-57:46:15.5 |
HIP 42885 |
8.03 |
| 2026-04-04 12:00 |
08:43:22.35 |
-57:45:51.9 |
HIP 42885 |
8.22 |
| 2026-04-05 00:00 |
08:43:20.95 |
-57:45:28.2 |
HIP 42885 |
8.43 |
| 2026-04-05 12:00 |
08:43:19.57 |
-57:45:04.4 |
HIP 42885 |
8.66 |
| 2026-04-06 00:00 |
08:43:18.22 |
-57:44:40.5 |
HIP 42885 |
8.90 |
| 2026-04-06 12:00 |
08:43:16.89 |
-57:44:16.5 |
HIP 42885 |
9.14 |
| 2026-04-07 00:00 |
08:43:15.59 |
-57:43:52.5 |
HIP 42885 |
9.40 |
| 2026-04-07 12:00 |
08:43:14.32 |
-57:43:28.5 |
HIP 42755 |
9.50 |
| 2026-04-08 00:00 |
08:43:13.07 |
-57:43:04.3 |
HIP 42755 |
9.06 |
| 2026-04-08 12:00 |
08:43:11.85 |
-57:42:40.1 |
HIP 42755 |
8.63 |
| 2026-04-09 00:00 |
08:43:10.65 |
-57:42:15.8 |
HIP 42755 |
8.19 |
| 2026-04-09 12:00 |
08:43:09.48 |
-57:41:51.5 |
HIP 42755 |
7.76 |
| 2026-04-10 00:00 |
08:43:08.34 |
-57:41:27.1 |
HIP 42755 |
7.32 |
| 2026-04-10 12:00 |
08:43:07.22 |
-57:41:02.7 |
HIP 42755 |
6.89 |
| 2026-04-11 00:00 |
08:43:06.13 |
-57:40:38.2 |
HIP 42755 |
6.46 |
| 2026-04-11 12:00 |
08:43:05.06 |
-57:40:13.6 |
HIP 42755 |
6.02 |
| 2026-04-12 00:00 |
08:43:04.02 |
-57:39:49.0 |
HIP 42755 |
5.59 |
| 2026-04-12 12:00 |
08:43:03.01 |
-57:39:24.4 |
HIP 42755 |
5.16 |
| 2026-04-13 00:00 |
08:43:02.03 |
-57:38:59.7 |
HIP 42755 |
4.73 |
| 2026-04-13 12:00 |
08:43:01.07 |
-57:38:35.0 |
HIP 42755 |
4.30 |
| 2026-04-14 00:00 |
08:43:00.13 |
-57:38:10.2 |
HIP 42755 |
3.87 |
| 2026-04-14 12:00 |
08:42:59.23 |
-57:37:45.4 |
HIP 42755 |
3.45 |
| 2026-04-15 00:00 |
08:42:58.35 |
-57:37:20.5 |
HIP 42755 |
3.02 |
| 2026-04-15 12:00 |
08:42:57.49 |
-57:36:55.6 |
HIP 42755 |
2.60 |
| 2026-04-16 00:00 |
08:42:56.67 |
-57:36:30.7 |
HIP 42755 |
2.19 |