C/1992 F1 (Tanaka-Machholz)
| 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 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
08:03:51.15 |
-29:41:46.1 |
HIP 39439 |
16.75 |
| 2026-02-03 12:00 |
08:03:48.81 |
-29:41:36.6 |
HIP 39439 |
16.54 |
| 2026-02-04 00:00 |
08:03:46.47 |
-29:41:26.8 |
HIP 39439 |
16.34 |
| 2026-02-04 12:00 |
08:03:44.14 |
-29:41:16.8 |
HIP 39439 |
16.15 |
| 2026-02-05 00:00 |
08:03:41.81 |
-29:41:06.7 |
HIP 39439 |
15.97 |
| 2026-02-05 12:00 |
08:03:39.49 |
-29:40:56.3 |
HIP 39439 |
15.81 |
| 2026-02-06 00:00 |
08:03:37.17 |
-29:40:45.7 |
HIP 39439 |
15.66 |
| 2026-02-06 12:00 |
08:03:34.86 |
-29:40:35.0 |
HIP 39439 |
15.52 |
| 2026-02-07 00:00 |
08:03:32.56 |
-29:40:24.0 |
HIP 39439 |
15.40 |
| 2026-02-07 12:00 |
08:03:30.27 |
-29:40:12.9 |
HIP 39439 |
15.29 |
| 2026-02-08 00:00 |
08:03:27.98 |
-29:40:01.5 |
HIP 39439 |
15.20 |
| 2026-02-08 12:00 |
08:03:25.70 |
-29:39:50.0 |
HIP 39439 |
15.12 |
| 2026-02-09 00:00 |
08:03:23.43 |
-29:39:38.3 |
HIP 39439 |
15.05 |
| 2026-02-09 12:00 |
08:03:21.17 |
-29:39:26.4 |
HIP 39439 |
15.00 |
| 2026-02-10 00:00 |
08:03:18.91 |
-29:39:14.3 |
HIP 39439 |
14.97 |
| 2026-02-10 12:00 |
08:03:16.67 |
-29:39:02.0 |
HIP 39439 |
14.95 |
| 2026-02-11 00:00 |
08:03:14.43 |
-29:38:49.5 |
HIP 39439 |
14.95 |
| 2026-02-11 12:00 |
08:03:12.20 |
-29:38:36.9 |
HIP 39439 |
14.96 |
| 2026-02-12 00:00 |
08:03:09.98 |
-29:38:24.0 |
HIP 39439 |
14.98 |
| 2026-02-12 12:00 |
08:03:07.76 |
-29:38:11.0 |
HIP 39439 |
15.02 |
| 2026-02-13 00:00 |
08:03:05.56 |
-29:37:57.8 |
HIP 39439 |
15.08 |
| 2026-02-13 12:00 |
08:03:03.37 |
-29:37:44.4 |
HIP 39439 |
15.15 |
| 2026-02-14 00:00 |
08:03:01.18 |
-29:37:30.8 |
HIP 39439 |
15.24 |
| 2026-02-14 12:00 |
08:02:59.01 |
-29:37:17.1 |
HIP 39439 |
15.33 |
| 2026-02-15 00:00 |
08:02:56.84 |
-29:37:03.1 |
HIP 39439 |
15.45 |
| 2026-02-15 12:00 |
08:02:54.69 |
-29:36:49.0 |
HIP 39439 |
15.57 |
| 2026-02-16 00:00 |
08:02:52.54 |
-29:36:34.7 |
HIP 39439 |
15.71 |
| 2026-02-16 12:00 |
08:02:50.41 |
-29:36:20.3 |
HIP 39439 |
15.86 |
| 2026-02-17 00:00 |
08:02:48.29 |
-29:36:05.7 |
HIP 39439 |
16.02 |
| 2026-02-17 12:00 |
08:02:46.17 |
-29:35:50.9 |
HIP 39439 |
16.20 |
| 2026-02-18 00:00 |
08:02:44.07 |
-29:35:35.9 |
HIP 39439 |
16.39 |
| 2026-02-18 12:00 |
08:02:41.98 |
-29:35:20.8 |
HIP 39439 |
16.58 |
| 2026-02-19 00:00 |
08:02:39.90 |
-29:35:05.5 |
HIP 39439 |
16.79 |
| 2026-02-19 12:00 |
08:02:37.83 |
-29:34:50.0 |
HIP 39439 |
17.00 |
| 2026-02-20 00:00 |
08:02:35.78 |
-29:34:34.4 |
HIP 39439 |
17.23 |
| 2026-02-20 12:00 |
08:02:33.73 |
-29:34:18.6 |
HIP 39439 |
17.46 |
| 2026-02-21 00:00 |
08:02:31.70 |
-29:34:02.6 |
HIP 39206 |
17.34 |
| 2026-02-21 12:00 |
08:02:29.68 |
-29:33:46.5 |
HIP 39206 |
16.89 |
| 2026-02-22 00:00 |
08:02:27.67 |
-29:33:30.3 |
HIP 39206 |
16.45 |
| 2026-02-22 12:00 |
08:02:25.67 |
-29:33:13.8 |
HIP 39206 |
16.02 |
| 2026-02-23 00:00 |
08:02:23.69 |
-29:32:57.3 |
HIP 39206 |
15.60 |
| 2026-02-23 12:00 |
08:02:21.72 |
-29:32:40.6 |
HIP 39206 |
15.18 |
| 2026-02-24 00:00 |
08:02:19.76 |
-29:32:23.7 |
HIP 39206 |
14.78 |