| 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) |
| 2026-07-29 00:00 |
08:48:10.20 |
-56:39:18.9 |
HIP 43203 |
2.31 |
| 2026-07-29 12:00 |
08:48:13.10 |
-56:39:19.4 |
HIP 43203 |
2.47 |
| 2026-07-30 00:00 |
08:48:16.00 |
-56:39:20.1 |
HIP 43203 |
2.67 |
| 2026-07-30 12:00 |
08:48:18.90 |
-56:39:21.0 |
HIP 43203 |
2.91 |
| 2026-07-31 00:00 |
08:48:21.80 |
-56:39:22.1 |
HIP 43203 |
3.18 |
| 2026-07-31 12:00 |
08:48:24.71 |
-56:39:23.4 |
HIP 43203 |
3.48 |
| 2026-08-01 00:00 |
08:48:27.61 |
-56:39:25.0 |
HIP 43203 |
3.79 |
| 2026-08-01 12:00 |
08:48:30.52 |
-56:39:26.7 |
HIP 43203 |
4.11 |
| 2026-08-02 00:00 |
08:48:33.43 |
-56:39:28.6 |
HIP 43203 |
4.45 |
| 2026-08-02 12:00 |
08:48:36.33 |
-56:39:30.8 |
HIP 43203 |
4.79 |
| 2026-08-03 00:00 |
08:48:39.24 |
-56:39:33.1 |
HIP 43203 |
5.15 |
| 2026-08-03 12:00 |
08:48:42.14 |
-56:39:35.7 |
HIP 43203 |
5.50 |
| 2026-08-04 00:00 |
08:48:45.05 |
-56:39:38.4 |
HIP 43203 |
5.86 |
| 2026-08-04 12:00 |
08:48:47.95 |
-56:39:41.4 |
HIP 43203 |
6.23 |
| 2026-08-05 00:00 |
08:48:50.85 |
-56:39:44.5 |
HIP 43203 |
6.60 |
| 2026-08-05 12:00 |
08:48:53.75 |
-56:39:47.9 |
HIP 43203 |
6.97 |
| 2026-08-06 00:00 |
08:48:56.66 |
-56:39:51.4 |
HIP 43203 |
7.34 |
| 2026-08-06 12:00 |
08:48:59.55 |
-56:39:55.2 |
HIP 43203 |
7.72 |
| 2026-08-07 00:00 |
08:49:02.45 |
-56:39:59.2 |
HIP 43203 |
8.10 |
| 2026-08-07 12:00 |
08:49:05.35 |
-56:40:03.3 |
HIP 43203 |
8.47 |
| 2026-08-08 00:00 |
08:49:08.24 |
-56:40:07.7 |
HIP 43203 |
8.85 |
| 2026-08-08 12:00 |
08:49:11.13 |
-56:40:12.3 |
HIP 43203 |
9.24 |
| 2026-08-09 00:00 |
08:49:14.02 |
-56:40:17.1 |
HIP 43203 |
9.62 |
| 2026-08-09 12:00 |
08:49:16.91 |
-56:40:22.0 |
HIP 43203 |
10.00 |
| 2026-08-10 00:00 |
08:49:19.79 |
-56:40:27.2 |
HIP 43203 |
10.39 |
| 2026-08-10 12:00 |
08:49:22.67 |
-56:40:32.6 |
HIP 43203 |
10.77 |
| 2026-08-11 00:00 |
08:49:25.55 |
-56:40:38.2 |
HIP 43203 |
11.16 |
| 2026-08-11 12:00 |
08:49:28.42 |
-56:40:44.0 |
HIP 43203 |
11.54 |
| 2026-08-12 00:00 |
08:49:31.29 |
-56:40:50.0 |
HIP 43203 |
11.93 |
| 2026-08-12 12:00 |
08:49:34.15 |
-56:40:56.2 |
HIP 43203 |
12.32 |
| 2026-08-13 00:00 |
08:49:37.01 |
-56:41:02.5 |
HIP 43203 |
12.71 |
| 2026-08-13 12:00 |
08:49:39.87 |
-56:41:09.1 |
HIP 43203 |
13.09 |
| 2026-08-14 00:00 |
08:49:42.72 |
-56:41:15.9 |
HIP 43203 |
13.48 |
| 2026-08-14 12:00 |
08:49:45.57 |
-56:41:22.9 |
HIP 43203 |
13.87 |
| 2026-08-15 00:00 |
08:49:48.41 |
-56:41:30.1 |
HIP 43203 |
14.26 |
| 2026-08-15 12:00 |
08:49:51.25 |
-56:41:37.5 |
HIP 43203 |
14.65 |
| 2026-08-16 00:00 |
08:49:54.08 |
-56:41:45.0 |
HIP 43203 |
15.04 |
| 2026-08-16 12:00 |
08:49:56.91 |
-56:41:52.8 |
HIP 43203 |
15.43 |
| 2026-08-17 00:00 |
08:49:59.73 |
-56:42:00.8 |
HIP 43203 |
15.82 |
| 2026-08-17 12:00 |
08:50:02.54 |
-56:42:08.9 |
HIP 43203 |
16.21 |
| 2026-08-18 00:00 |
08:50:05.35 |
-56:42:17.3 |
HIP 43203 |
16.60 |
| 2026-08-18 12:00 |
08:50:08.15 |
-56:42:25.8 |
HIP 43203 |
16.99 |
| 2026-08-19 00:00 |
08:50:10.94 |
-56:42:34.6 |
HIP 43203 |
17.38 |