| 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) |
| 2026-09-20 00:00 |
08:52:47.72 |
-56:58:02.1 |
HIP 43462 |
14.93 |
| 2026-09-20 12:00 |
08:52:49.69 |
-56:58:21.7 |
HIP 43462 |
15.04 |
| 2026-09-21 00:00 |
08:52:51.65 |
-56:58:41.4 |
HIP 43462 |
15.15 |
| 2026-09-21 12:00 |
08:52:53.59 |
-56:59:01.3 |
HIP 43462 |
15.27 |
| 2026-09-22 00:00 |
08:52:55.51 |
-56:59:21.2 |
HIP 43462 |
15.40 |
| 2026-09-22 12:00 |
08:52:57.41 |
-56:59:41.3 |
HIP 43462 |
15.53 |
| 2026-09-23 00:00 |
08:52:59.29 |
-57:00:01.6 |
HIP 43462 |
15.68 |
| 2026-09-23 12:00 |
08:53:01.16 |
-57:00:21.9 |
HIP 43462 |
15.82 |
| 2026-09-24 00:00 |
08:53:03.00 |
-57:00:42.4 |
HIP 43462 |
15.98 |
| 2026-09-24 12:00 |
08:53:04.83 |
-57:01:03.0 |
HIP 43462 |
16.14 |
| 2026-09-25 00:00 |
08:53:06.63 |
-57:01:23.7 |
HIP 43462 |
16.31 |
| 2026-09-25 12:00 |
08:53:08.42 |
-57:01:44.6 |
HIP 43462 |
16.49 |
| 2026-09-26 00:00 |
08:53:10.18 |
-57:02:05.5 |
HIP 43462 |
16.67 |
| 2026-09-26 12:00 |
08:53:11.93 |
-57:02:26.6 |
HIP 43462 |
16.86 |
| 2026-09-27 00:00 |
08:53:13.66 |
-57:02:47.8 |
HIP 43462 |
17.05 |
| 2026-09-27 12:00 |
08:53:15.36 |
-57:03:09.1 |
HIP 43462 |
17.24 |
| 2026-09-28 00:00 |
08:53:17.05 |
-57:03:30.5 |
HIP 43462 |
17.45 |
| 2026-09-28 12:00 |
08:53:18.72 |
-57:03:52.0 |
HIP 43462 |
17.66 |
| 2026-09-29 00:00 |
08:53:20.36 |
-57:04:13.6 |
HIP 43462 |
17.87 |
| 2026-09-29 12:00 |
08:53:21.99 |
-57:04:35.4 |
HIP 43462 |
18.08 |
| 2026-09-30 00:00 |
08:53:23.59 |
-57:04:57.2 |
HIP 43462 |
18.31 |
| 2026-09-30 12:00 |
08:53:25.17 |
-57:05:19.2 |
HIP 43462 |
18.53 |
| 2026-10-01 00:00 |
08:53:26.74 |
-57:05:41.2 |
HIP 43462 |
18.76 |
| 2026-10-01 12:00 |
08:53:28.28 |
-57:06:03.4 |
HIP 43462 |
18.99 |
| 2026-10-02 00:00 |
08:53:29.80 |
-57:06:25.7 |
HIP 43462 |
19.23 |
| 2026-10-02 12:00 |
08:53:31.30 |
-57:06:48.0 |
HIP 43462 |
19.47 |
| 2026-10-03 00:00 |
08:53:32.77 |
-57:07:10.5 |
HIP 43462 |
19.72 |
| 2026-10-03 12:00 |
08:53:34.23 |
-57:07:33.1 |
HIP 43462 |
19.97 |
| 2026-10-04 00:00 |
08:53:35.66 |
-57:07:55.7 |
HIP 43462 |
20.22 |
| 2026-10-04 12:00 |
08:53:37.07 |
-57:08:18.5 |
HIP 43462 |
20.47 |
| 2026-10-05 00:00 |
08:53:38.46 |
-57:08:41.3 |
HIP 43462 |
20.73 |
| 2026-10-05 12:00 |
08:53:39.83 |
-57:09:04.3 |
HIP 43462 |
20.99 |
| 2026-10-06 00:00 |
08:53:41.17 |
-57:09:27.3 |
HIP 43462 |
21.25 |
| 2026-10-06 12:00 |
08:53:42.49 |
-57:09:50.4 |
HIP 43462 |
21.51 |
| 2026-10-07 00:00 |
08:53:43.79 |
-57:10:13.6 |
HIP 43462 |
21.78 |
| 2026-10-07 12:00 |
08:53:45.07 |
-57:10:36.9 |
HIP 43462 |
22.05 |
| 2026-10-08 00:00 |
08:53:46.32 |
-57:11:00.3 |
HIP 43462 |
22.32 |
| 2026-10-08 12:00 |
08:53:47.55 |
-57:11:23.7 |
HIP 43462 |
22.59 |
| 2026-10-09 00:00 |
08:53:48.75 |
-57:11:47.2 |
HIP 43462 |
22.87 |
| 2026-10-09 12:00 |
08:53:49.94 |
-57:12:10.9 |
HIP 43462 |
23.15 |
| 2026-10-10 00:00 |
08:53:51.10 |
-57:12:34.5 |
HIP 43462 |
23.43 |
| 2026-10-10 12:00 |
08:53:52.23 |
-57:12:58.3 |
HIP 43462 |
23.71 |
| 2026-10-11 00:00 |
08:53:53.34 |
-57:13:22.1 |
HIP 43462 |
23.99 |