| Parameter |
Value |
| Designation |
C/1993 Q1 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-03-26T06:39:06.874560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
495 |
| NEO |
- |
| M1 |
9.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1993-10-28.0000000 |
| e |
1.00032242 |
| q (au) |
0.967251 |
| a (au) |
-2999.968986 |
| i (deg) |
105.026500 |
| Ω (om, deg) |
193.788984 |
| ω (w, deg) |
261.032961 |
| M (ma, deg) |
-0.000895 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.169 + 4.619\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.169 |
| n |
4.619 |
| gf |
1.000 |
| gb |
-0.687 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1992-09-28 |
1993-12-09 |
-0.3959 |
+0.181 |
| 1993-12-09 |
1994-02-02 |
+0.8399 |
-0.656 |
| 1994-04-01 |
1994-07-02 |
+14.9311 |
-0.152 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
13:50:17.51 |
+60:14:30.1 |
HIP 67528 |
16.76 |
| 2026-03-26 12:00 |
13:50:13.88 |
+60:14:47.1 |
HIP 67528 |
16.45 |
| 2026-03-27 00:00 |
13:50:10.24 |
+60:15:03.8 |
HIP 67528 |
16.16 |
| 2026-03-27 12:00 |
13:50:06.58 |
+60:15:20.3 |
HIP 67528 |
15.88 |
| 2026-03-28 00:00 |
13:50:02.91 |
+60:15:36.5 |
HIP 67528 |
15.62 |
| 2026-03-28 12:00 |
13:49:59.23 |
+60:15:52.5 |
HIP 67528 |
15.38 |
| 2026-03-29 00:00 |
13:49:55.53 |
+60:16:08.3 |
HIP 67528 |
15.16 |
| 2026-03-29 12:00 |
13:49:51.82 |
+60:16:23.8 |
HIP 67528 |
14.95 |
| 2026-03-30 00:00 |
13:49:48.09 |
+60:16:39.1 |
HIP 67528 |
14.77 |
| 2026-03-30 12:00 |
13:49:44.35 |
+60:16:54.1 |
HIP 67528 |
14.61 |
| 2026-03-31 00:00 |
13:49:40.60 |
+60:17:08.9 |
HIP 67528 |
14.47 |
| 2026-03-31 12:00 |
13:49:36.84 |
+60:17:23.5 |
HIP 67528 |
14.35 |
| 2026-04-01 00:00 |
13:49:33.07 |
+60:17:37.8 |
HIP 67528 |
14.25 |
| 2026-04-01 12:00 |
13:49:29.28 |
+60:17:51.8 |
HIP 67528 |
14.18 |
| 2026-04-02 00:00 |
13:49:25.49 |
+60:18:05.6 |
HIP 67528 |
14.13 |
| 2026-04-02 12:00 |
13:49:21.68 |
+60:18:19.2 |
HIP 67528 |
14.10 |
| 2026-04-03 00:00 |
13:49:17.86 |
+60:18:32.5 |
HIP 67528 |
14.10 |
| 2026-04-03 12:00 |
13:49:14.04 |
+60:18:45.6 |
HIP 67528 |
14.12 |
| 2026-04-04 00:00 |
13:49:10.20 |
+60:18:58.4 |
HIP 67528 |
14.16 |
| 2026-04-04 12:00 |
13:49:06.35 |
+60:19:11.0 |
HIP 67528 |
14.22 |
| 2026-04-05 00:00 |
13:49:02.50 |
+60:19:23.3 |
HIP 67528 |
14.31 |
| 2026-04-05 12:00 |
13:48:58.63 |
+60:19:35.3 |
HIP 67528 |
14.42 |
| 2026-04-06 00:00 |
13:48:54.76 |
+60:19:47.1 |
HIP 67528 |
14.56 |
| 2026-04-06 12:00 |
13:48:50.88 |
+60:19:58.7 |
HIP 67528 |
14.71 |
| 2026-04-07 00:00 |
13:48:46.99 |
+60:20:10.0 |
HIP 67528 |
14.88 |
| 2026-04-07 12:00 |
13:48:43.09 |
+60:20:21.0 |
HIP 67528 |
15.08 |
| 2026-04-08 00:00 |
13:48:39.18 |
+60:20:31.8 |
HIP 67528 |
15.29 |
| 2026-04-08 12:00 |
13:48:35.27 |
+60:20:42.4 |
HIP 67528 |
15.52 |
| 2026-04-09 00:00 |
13:48:31.35 |
+60:20:52.6 |
HIP 67528 |
15.76 |
| 2026-04-09 12:00 |
13:48:27.42 |
+60:21:02.6 |
HIP 67247 |
15.66 |
| 2026-04-10 00:00 |
13:48:23.49 |
+60:21:12.4 |
HIP 67247 |
15.43 |
| 2026-04-10 12:00 |
13:48:19.55 |
+60:21:21.9 |
HIP 67247 |
15.22 |
| 2026-04-11 00:00 |
13:48:15.61 |
+60:21:31.1 |
HIP 67247 |
15.01 |
| 2026-04-11 12:00 |
13:48:11.66 |
+60:21:40.1 |
HIP 67247 |
14.82 |
| 2026-04-12 00:00 |
13:48:07.71 |
+60:21:48.8 |
HIP 67247 |
14.64 |
| 2026-04-12 12:00 |
13:48:03.75 |
+60:21:57.3 |
HIP 67247 |
14.47 |
| 2026-04-13 00:00 |
13:47:59.79 |
+60:22:05.4 |
HIP 67247 |
14.31 |
| 2026-04-13 12:00 |
13:47:55.82 |
+60:22:13.4 |
HIP 67247 |
14.16 |
| 2026-04-14 00:00 |
13:47:51.85 |
+60:22:21.0 |
HIP 67247 |
14.03 |
| 2026-04-14 12:00 |
13:47:47.88 |
+60:22:28.4 |
HIP 67247 |
13.91 |
| 2026-04-15 00:00 |
13:47:43.90 |
+60:22:35.5 |
HIP 67247 |
13.80 |
| 2026-04-15 12:00 |
13:47:39.92 |
+60:22:42.4 |
HIP 67247 |
13.71 |
| 2026-04-16 00:00 |
13:47:35.94 |
+60:22:49.0 |
HIP 67247 |
13.63 |