C/1980 V1 (Meier)
| 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) |
| 2026-02-03 00:00 |
08:48:38.79 |
-58:16:17.2 |
HIP 43237 |
3.08 |
| 2026-02-03 12:00 |
08:48:35.46 |
-58:16:13.9 |
HIP 43237 |
2.84 |
| 2026-02-04 00:00 |
08:48:32.13 |
-58:16:10.2 |
HIP 43237 |
2.64 |
| 2026-02-04 12:00 |
08:48:28.80 |
-58:16:06.4 |
HIP 43237 |
2.50 |
| 2026-02-05 00:00 |
08:48:25.48 |
-58:16:02.3 |
HIP 43237 |
2.43 |
| 2026-02-05 12:00 |
08:48:22.16 |
-58:15:58.0 |
HIP 43237 |
2.44 |
| 2026-02-06 00:00 |
08:48:18.84 |
-58:15:53.5 |
HIP 43237 |
2.52 |
| 2026-02-06 12:00 |
08:48:15.52 |
-58:15:48.8 |
HIP 43237 |
2.67 |
| 2026-02-07 00:00 |
08:48:12.21 |
-58:15:43.8 |
HIP 43237 |
2.88 |
| 2026-02-07 12:00 |
08:48:08.90 |
-58:15:38.6 |
HIP 43237 |
3.13 |
| 2026-02-08 00:00 |
08:48:05.60 |
-58:15:33.2 |
HIP 43237 |
3.42 |
| 2026-02-08 12:00 |
08:48:02.30 |
-58:15:27.5 |
HIP 43237 |
3.74 |
| 2026-02-09 00:00 |
08:47:59.01 |
-58:15:21.6 |
HIP 43237 |
4.08 |
| 2026-02-09 12:00 |
08:47:55.72 |
-58:15:15.5 |
HIP 43237 |
4.44 |
| 2026-02-10 00:00 |
08:47:52.44 |
-58:15:09.2 |
HIP 43237 |
4.81 |
| 2026-02-10 12:00 |
08:47:49.17 |
-58:15:02.6 |
HIP 43237 |
5.19 |
| 2026-02-11 00:00 |
08:47:45.90 |
-58:14:55.9 |
HIP 43237 |
5.57 |
| 2026-02-11 12:00 |
08:47:42.63 |
-58:14:48.9 |
HIP 43237 |
5.97 |
| 2026-02-12 00:00 |
08:47:39.37 |
-58:14:41.6 |
HIP 43237 |
6.37 |
| 2026-02-12 12:00 |
08:47:36.12 |
-58:14:34.2 |
HIP 43237 |
6.77 |
| 2026-02-13 00:00 |
08:47:32.88 |
-58:14:26.5 |
HIP 43237 |
7.18 |
| 2026-02-13 12:00 |
08:47:29.64 |
-58:14:18.7 |
HIP 43237 |
7.59 |
| 2026-02-14 00:00 |
08:47:26.42 |
-58:14:10.5 |
HIP 43237 |
8.00 |
| 2026-02-14 12:00 |
08:47:23.19 |
-58:14:02.2 |
HIP 43237 |
8.42 |
| 2026-02-15 00:00 |
08:47:19.98 |
-58:13:53.7 |
HIP 43237 |
8.83 |
| 2026-02-15 12:00 |
08:47:16.78 |
-58:13:44.9 |
HIP 43237 |
9.25 |
| 2026-02-16 00:00 |
08:47:13.58 |
-58:13:35.9 |
HIP 43237 |
9.67 |
| 2026-02-16 12:00 |
08:47:10.40 |
-58:13:26.7 |
HIP 43237 |
10.09 |
| 2026-02-17 00:00 |
08:47:07.22 |
-58:13:17.3 |
HIP 43237 |
10.52 |
| 2026-02-17 12:00 |
08:47:04.05 |
-58:13:07.7 |
HIP 43237 |
10.94 |
| 2026-02-18 00:00 |
08:47:00.89 |
-58:12:57.9 |
HIP 43237 |
11.36 |
| 2026-02-18 12:00 |
08:46:57.75 |
-58:12:47.8 |
HIP 43237 |
11.79 |
| 2026-02-19 00:00 |
08:46:54.61 |
-58:12:37.6 |
HIP 43237 |
12.21 |
| 2026-02-19 12:00 |
08:46:51.48 |
-58:12:27.1 |
HIP 43237 |
12.64 |
| 2026-02-20 00:00 |
08:46:48.37 |
-58:12:16.4 |
HIP 43237 |
13.07 |
| 2026-02-20 12:00 |
08:46:45.26 |
-58:12:05.5 |
HIP 43237 |
13.49 |
| 2026-02-21 00:00 |
08:46:42.17 |
-58:11:54.4 |
HIP 43237 |
13.92 |
| 2026-02-21 12:00 |
08:46:39.09 |
-58:11:43.1 |
HIP 43237 |
14.35 |
| 2026-02-22 00:00 |
08:46:36.02 |
-58:11:31.6 |
HIP 43237 |
14.77 |
| 2026-02-22 12:00 |
08:46:32.96 |
-58:11:19.9 |
HIP 43237 |
15.20 |
| 2026-02-23 00:00 |
08:46:29.91 |
-58:11:08.0 |
HIP 43237 |
15.63 |
| 2026-02-23 12:00 |
08:46:26.88 |
-58:10:55.8 |
HIP 43237 |
16.06 |
| 2026-02-24 00:00 |
08:46:23.86 |
-58:10:43.5 |
HIP 43237 |
16.48 |