| Parameter |
Value |
| Designation |
C/1992 F1 (Tanaka-Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-04-22T16:35:26.859840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
167 |
| NEO |
- |
| M1 |
5.600 |
| K1 |
19.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1992-05-25.0000000 |
| e |
0.99597703 |
| q (au) |
1.261503 |
| a (au) |
313.574953 |
| i (deg) |
79.292423 |
| Ω (om, deg) |
300.508310 |
| ω (w, deg) |
65.475657 |
| M (ma, deg) |
0.005735 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.541 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.541 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.500 |
| 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) |
| 2026-09-20 00:00 |
08:08:46.36 |
-28:48:05.0 |
HIP 39732 |
25.61 |
| 2026-09-20 12:00 |
08:08:47.57 |
-28:48:27.7 |
HIP 39732 |
25.57 |
| 2026-09-21 00:00 |
08:08:48.76 |
-28:48:50.6 |
HIP 39732 |
25.53 |
| 2026-09-21 12:00 |
08:08:49.93 |
-28:49:13.5 |
HIP 39902 |
25.36 |
| 2026-09-22 00:00 |
08:08:51.09 |
-28:49:36.5 |
HIP 39902 |
24.96 |
| 2026-09-22 12:00 |
08:08:52.23 |
-28:49:59.5 |
HIP 39902 |
24.56 |
| 2026-09-23 00:00 |
08:08:53.36 |
-28:50:22.7 |
HIP 39902 |
24.16 |
| 2026-09-23 12:00 |
08:08:54.47 |
-28:50:45.9 |
HIP 39902 |
23.76 |
| 2026-09-24 00:00 |
08:08:55.56 |
-28:51:09.1 |
HIP 39902 |
23.36 |
| 2026-09-24 12:00 |
08:08:56.63 |
-28:51:32.4 |
HIP 39902 |
22.97 |
| 2026-09-25 00:00 |
08:08:57.69 |
-28:51:55.8 |
HIP 39902 |
22.57 |
| 2026-09-25 12:00 |
08:08:58.73 |
-28:52:19.3 |
HIP 39902 |
22.18 |
| 2026-09-26 00:00 |
08:08:59.76 |
-28:52:42.8 |
HIP 39902 |
21.79 |
| 2026-09-26 12:00 |
08:09:00.77 |
-28:53:06.4 |
HIP 39902 |
21.40 |
| 2026-09-27 00:00 |
08:09:01.76 |
-28:53:30.0 |
HIP 39902 |
21.01 |
| 2026-09-27 12:00 |
08:09:02.73 |
-28:53:53.7 |
HIP 39902 |
20.62 |
| 2026-09-28 00:00 |
08:09:03.69 |
-28:54:17.5 |
HIP 39902 |
20.23 |
| 2026-09-28 12:00 |
08:09:04.62 |
-28:54:41.3 |
HIP 39902 |
19.85 |
| 2026-09-29 00:00 |
08:09:05.54 |
-28:55:05.2 |
HIP 39902 |
19.46 |
| 2026-09-29 12:00 |
08:09:06.45 |
-28:55:29.1 |
HIP 39902 |
19.08 |
| 2026-09-30 00:00 |
08:09:07.33 |
-28:55:53.1 |
HIP 39902 |
18.70 |
| 2026-09-30 12:00 |
08:09:08.20 |
-28:56:17.1 |
HIP 39902 |
18.32 |
| 2026-10-01 00:00 |
08:09:09.05 |
-28:56:41.2 |
HIP 39902 |
17.94 |
| 2026-10-01 12:00 |
08:09:09.88 |
-28:57:05.3 |
HIP 39902 |
17.57 |
| 2026-10-02 00:00 |
08:09:10.70 |
-28:57:29.4 |
HIP 39902 |
17.19 |
| 2026-10-02 12:00 |
08:09:11.49 |
-28:57:53.6 |
HIP 39902 |
16.82 |
| 2026-10-03 00:00 |
08:09:12.27 |
-28:58:17.9 |
HIP 39902 |
16.45 |
| 2026-10-03 12:00 |
08:09:13.03 |
-28:58:42.1 |
HIP 39902 |
16.08 |
| 2026-10-04 00:00 |
08:09:13.77 |
-28:59:06.5 |
HIP 39902 |
15.72 |
| 2026-10-04 12:00 |
08:09:14.50 |
-28:59:30.8 |
HIP 39902 |
15.35 |
| 2026-10-05 00:00 |
08:09:15.20 |
-28:59:55.2 |
HIP 39902 |
14.99 |
| 2026-10-05 12:00 |
08:09:15.89 |
-29:00:19.6 |
HIP 39902 |
14.63 |
| 2026-10-06 00:00 |
08:09:16.55 |
-29:00:44.1 |
HIP 39902 |
14.27 |
| 2026-10-06 12:00 |
08:09:17.20 |
-29:01:08.6 |
HIP 39902 |
13.92 |
| 2026-10-07 00:00 |
08:09:17.83 |
-29:01:33.1 |
HIP 39902 |
13.57 |
| 2026-10-07 12:00 |
08:09:18.44 |
-29:01:57.6 |
HIP 39902 |
13.22 |
| 2026-10-08 00:00 |
08:09:19.04 |
-29:02:22.2 |
HIP 39902 |
12.88 |
| 2026-10-08 12:00 |
08:09:19.61 |
-29:02:46.8 |
HIP 39902 |
12.53 |
| 2026-10-09 00:00 |
08:09:20.16 |
-29:03:11.4 |
HIP 39902 |
12.20 |
| 2026-10-09 12:00 |
08:09:20.70 |
-29:03:36.0 |
HIP 39902 |
11.86 |
| 2026-10-10 00:00 |
08:09:21.21 |
-29:04:00.7 |
HIP 39902 |
11.53 |
| 2026-10-10 12:00 |
08:09:21.71 |
-29:04:25.3 |
HIP 39902 |
11.21 |
| 2026-10-11 00:00 |
08:09:22.19 |
-29:04:50.0 |
HIP 39902 |
10.89 |