| Parameter |
Value |
| Designation |
C/1997 D1 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-10-11T14:47:59.519040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
430 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-07-13.0000000 |
| e |
1.00115666 |
| q (au) |
2.247622 |
| a (au) |
-1943.197807 |
| i (deg) |
141.889605 |
| Ω (om, deg) |
279.171154 |
| ω (w, deg) |
184.962587 |
| M (ma, deg) |
-0.001043 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.367 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.367 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.611 |
| k |
0.988 |
| 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 |
| 1997-02-17 |
1997-10-11 |
-0.9369 |
+0.030 |
| 1997-10-12 |
1998-09-02 |
+6.9714 |
-2.273 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
20:00:27.34 |
-32:46:02.8 |
HIP 98480 |
15.30 |
| 2026-06-01 12:00 |
20:00:25.40 |
-32:46:12.2 |
HIP 98480 |
15.14 |
| 2026-06-02 00:00 |
20:00:23.45 |
-32:46:21.7 |
HIP 98480 |
14.99 |
| 2026-06-02 12:00 |
20:00:21.48 |
-32:46:31.2 |
HIP 98480 |
14.84 |
| 2026-06-03 00:00 |
20:00:19.49 |
-32:46:40.6 |
HIP 98480 |
14.71 |
| 2026-06-03 12:00 |
20:00:17.48 |
-32:46:50.1 |
HIP 98480 |
14.60 |
| 2026-06-04 00:00 |
20:00:15.46 |
-32:46:59.6 |
HIP 98480 |
14.49 |
| 2026-06-04 12:00 |
20:00:13.42 |
-32:47:09.0 |
HIP 98480 |
14.40 |
| 2026-06-05 00:00 |
20:00:11.37 |
-32:47:18.5 |
HIP 98480 |
14.33 |
| 2026-06-05 12:00 |
20:00:09.29 |
-32:47:28.0 |
HIP 98480 |
14.27 |
| 2026-06-06 00:00 |
20:00:07.21 |
-32:47:37.4 |
HIP 98480 |
14.22 |
| 2026-06-06 12:00 |
20:00:05.10 |
-32:47:46.8 |
HIP 98480 |
14.20 |
| 2026-06-07 00:00 |
20:00:02.98 |
-32:47:56.3 |
HIP 98480 |
14.19 |
| 2026-06-07 12:00 |
20:00:00.84 |
-32:48:05.7 |
HIP 98480 |
14.19 |
| 2026-06-08 00:00 |
19:59:58.69 |
-32:48:15.1 |
HIP 98480 |
14.22 |
| 2026-06-08 12:00 |
19:59:56.52 |
-32:48:24.5 |
HIP 98480 |
14.26 |
| 2026-06-09 00:00 |
19:59:54.34 |
-32:48:33.9 |
HIP 98480 |
14.31 |
| 2026-06-09 12:00 |
19:59:52.14 |
-32:48:43.3 |
HIP 98480 |
14.39 |
| 2026-06-10 00:00 |
19:59:49.92 |
-32:48:52.7 |
HIP 98480 |
14.49 |
| 2026-06-10 12:00 |
19:59:47.69 |
-32:49:02.0 |
HIP 98480 |
14.60 |
| 2026-06-11 00:00 |
19:59:45.45 |
-32:49:11.4 |
HIP 98480 |
14.73 |
| 2026-06-11 12:00 |
19:59:43.19 |
-32:49:20.7 |
HIP 98480 |
14.87 |
| 2026-06-12 00:00 |
19:59:40.91 |
-32:49:30.0 |
HIP 98480 |
15.04 |
| 2026-06-12 12:00 |
19:59:38.62 |
-32:49:39.3 |
HIP 98480 |
15.22 |
| 2026-06-13 00:00 |
19:59:36.32 |
-32:49:48.6 |
HIP 98480 |
15.42 |
| 2026-06-13 12:00 |
19:59:34.00 |
-32:49:57.8 |
HIP 98480 |
15.63 |
| 2026-06-14 00:00 |
19:59:31.67 |
-32:50:07.1 |
HIP 98480 |
15.86 |
| 2026-06-14 12:00 |
19:59:29.33 |
-32:50:16.3 |
HIP 98480 |
16.11 |
| 2026-06-15 00:00 |
19:59:26.97 |
-32:50:25.5 |
HIP 98480 |
16.37 |
| 2026-06-15 12:00 |
19:59:24.60 |
-32:50:34.7 |
HIP 98480 |
16.64 |
| 2026-06-16 00:00 |
19:59:22.21 |
-32:50:43.8 |
HIP 98319 |
16.48 |
| 2026-06-16 12:00 |
19:59:19.81 |
-32:50:53.0 |
HIP 98319 |
16.29 |
| 2026-06-17 00:00 |
19:59:17.40 |
-32:51:02.1 |
HIP 98319 |
16.12 |
| 2026-06-17 12:00 |
19:59:14.97 |
-32:51:11.2 |
HIP 98319 |
15.97 |
| 2026-06-18 00:00 |
19:59:12.54 |
-32:51:20.2 |
HIP 98319 |
15.82 |
| 2026-06-18 12:00 |
19:59:10.09 |
-32:51:29.2 |
HIP 98319 |
15.70 |
| 2026-06-19 00:00 |
19:59:07.63 |
-32:51:38.2 |
HIP 98319 |
15.59 |
| 2026-06-19 12:00 |
19:59:05.15 |
-32:51:47.2 |
HIP 98319 |
15.50 |
| 2026-06-20 00:00 |
19:59:02.67 |
-32:51:56.2 |
HIP 98319 |
15.42 |
| 2026-06-20 12:00 |
19:59:00.17 |
-32:52:05.1 |
HIP 98319 |
15.36 |
| 2026-06-21 00:00 |
19:58:57.66 |
-32:52:14.0 |
HIP 98319 |
15.32 |
| 2026-06-21 12:00 |
19:58:55.14 |
-32:52:22.8 |
HIP 98319 |
15.30 |
| 2026-06-22 00:00 |
19:58:52.61 |
-32:52:31.7 |
HIP 98319 |
15.29 |