C/1997 J1 (Mueller)
| Parameter |
Value |
| Designation |
C/1997 J1 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-05-03T19:16:39.167040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
497 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-08-08.0000000 |
| e |
0.99099113 |
| q (au) |
2.302131 |
| a (au) |
255.540410 |
| i (deg) |
122.968328 |
| Ω (om, deg) |
277.076050 |
| ω (w, deg) |
98.954561 |
| M (ma, deg) |
0.023210 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.672 + 4.834\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.672 |
| n |
4.834 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| 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 |
03:19:22.94 |
-38:33:12.3 |
HIP 15370 |
17.62 |
| 2026-02-03 12:00 |
03:19:22.40 |
-38:32:44.0 |
HIP 15402 |
17.25 |
| 2026-02-04 00:00 |
03:19:21.90 |
-38:32:15.6 |
HIP 15402 |
16.80 |
| 2026-02-04 12:00 |
03:19:21.41 |
-38:31:47.2 |
HIP 15402 |
16.35 |
| 2026-02-05 00:00 |
03:19:20.95 |
-38:31:18.7 |
HIP 15402 |
15.90 |
| 2026-02-05 12:00 |
03:19:20.52 |
-38:30:50.1 |
HIP 15402 |
15.46 |
| 2026-02-06 00:00 |
03:19:20.12 |
-38:30:21.5 |
HIP 15402 |
15.03 |
| 2026-02-06 12:00 |
03:19:19.74 |
-38:29:52.8 |
HIP 15402 |
14.60 |
| 2026-02-07 00:00 |
03:19:19.39 |
-38:29:24.0 |
HIP 15402 |
14.17 |
| 2026-02-07 12:00 |
03:19:19.06 |
-38:28:55.2 |
HIP 15402 |
13.75 |
| 2026-02-08 00:00 |
03:19:18.76 |
-38:28:26.3 |
HIP 15402 |
13.34 |
| 2026-02-08 12:00 |
03:19:18.48 |
-38:27:57.3 |
HIP 15402 |
12.94 |
| 2026-02-09 00:00 |
03:19:18.24 |
-38:27:28.4 |
HIP 15402 |
12.54 |
| 2026-02-09 12:00 |
03:19:18.01 |
-38:26:59.3 |
HIP 15402 |
12.16 |
| 2026-02-10 00:00 |
03:19:17.82 |
-38:26:30.2 |
HIP 15402 |
11.78 |
| 2026-02-10 12:00 |
03:19:17.65 |
-38:26:01.1 |
HIP 15402 |
11.42 |
| 2026-02-11 00:00 |
03:19:17.50 |
-38:25:31.9 |
HIP 15402 |
11.07 |
| 2026-02-11 12:00 |
03:19:17.39 |
-38:25:02.7 |
HIP 15402 |
10.73 |
| 2026-02-12 00:00 |
03:19:17.30 |
-38:24:33.5 |
HIP 15402 |
10.41 |
| 2026-02-12 12:00 |
03:19:17.23 |
-38:24:04.2 |
HIP 15402 |
10.11 |
| 2026-02-13 00:00 |
03:19:17.19 |
-38:23:34.9 |
HIP 15402 |
9.82 |
| 2026-02-13 12:00 |
03:19:17.18 |
-38:23:05.5 |
HIP 15402 |
9.56 |
| 2026-02-14 00:00 |
03:19:17.19 |
-38:22:36.2 |
HIP 15402 |
9.32 |
| 2026-02-14 12:00 |
03:19:17.23 |
-38:22:06.8 |
HIP 15402 |
9.10 |
| 2026-02-15 00:00 |
03:19:17.29 |
-38:21:37.3 |
HIP 15402 |
8.91 |
| 2026-02-15 12:00 |
03:19:17.39 |
-38:21:07.9 |
HIP 15402 |
8.75 |
| 2026-02-16 00:00 |
03:19:17.50 |
-38:20:38.4 |
HIP 15402 |
8.61 |
| 2026-02-16 12:00 |
03:19:17.64 |
-38:20:09.0 |
HIP 15402 |
8.51 |
| 2026-02-17 00:00 |
03:19:17.81 |
-38:19:39.5 |
HIP 15402 |
8.44 |
| 2026-02-17 12:00 |
03:19:18.01 |
-38:19:10.0 |
HIP 15402 |
8.41 |
| 2026-02-18 00:00 |
03:19:18.23 |
-38:18:40.5 |
HIP 15484 |
8.29 |
| 2026-02-18 12:00 |
03:19:18.47 |
-38:18:10.9 |
HIP 15484 |
7.83 |
| 2026-02-19 00:00 |
03:19:18.75 |
-38:17:41.4 |
HIP 15484 |
7.36 |
| 2026-02-19 12:00 |
03:19:19.04 |
-38:17:11.9 |
HIP 15484 |
6.90 |
| 2026-02-20 00:00 |
03:19:19.37 |
-38:16:42.4 |
HIP 15484 |
6.43 |
| 2026-02-20 12:00 |
03:19:19.71 |
-38:16:12.9 |
HIP 15484 |
5.97 |
| 2026-02-21 00:00 |
03:19:20.09 |
-38:15:43.4 |
HIP 15484 |
5.52 |
| 2026-02-21 12:00 |
03:19:20.49 |
-38:15:13.9 |
HIP 15484 |
5.07 |
| 2026-02-22 00:00 |
03:19:20.91 |
-38:14:44.4 |
HIP 15484 |
4.62 |
| 2026-02-22 12:00 |
03:19:21.36 |
-38:14:14.9 |
HIP 15484 |
4.19 |
| 2026-02-23 00:00 |
03:19:21.83 |
-38:13:45.4 |
HIP 15484 |
3.77 |
| 2026-02-23 12:00 |
03:19:22.33 |
-38:13:16.0 |
HIP 15484 |
3.36 |
| 2026-02-24 00:00 |
03:19:22.86 |
-38:12:46.6 |
HIP 15484 |
2.98 |