| Parameter |
Value |
| Designation |
13P/Olbers |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-06-30T17:39:58.435200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T09:29:25Z |
| Obs used |
2481 |
| NEO |
Yes |
| M1 |
6.900 |
| K1 |
18.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-30.0000000 |
| e |
0.92970999 |
| q (au) |
1.172573 |
| a (au) |
16.681923 |
| i (deg) |
44.624812 |
| Ω (om, deg) |
85.862691 |
| ω (w, deg) |
64.528341 |
| M (ma, deg) |
340.186016 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.030 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.030 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-08-13 |
2024-06-30 |
+9.7486 |
-3.048 |
| 2024-06-30 |
2025-07-31 |
-0.2116 |
-1.978 |
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 |
19:30:02.66 |
-35:23:33.6 |
HIP 95753 |
24.19 |
| 2026-03-26 12:00 |
19:30:11.32 |
-35:24:55.2 |
HIP 95753 |
26.41 |
| 2026-03-27 00:00 |
19:30:19.82 |
-35:26:17.4 |
HIP 96113 |
26.62 |
| 2026-03-27 12:00 |
19:30:28.16 |
-35:27:40.1 |
HIP 96113 |
24.91 |
| 2026-03-28 00:00 |
19:30:36.34 |
-35:29:03.3 |
HIP 96113 |
23.32 |
| 2026-03-28 12:00 |
19:30:44.36 |
-35:30:27.0 |
HIP 96113 |
21.86 |
| 2026-03-29 00:00 |
19:30:52.22 |
-35:31:51.3 |
HIP 96113 |
20.55 |
| 2026-03-29 12:00 |
19:30:59.92 |
-35:33:16.0 |
HIP 96113 |
19.43 |
| 2026-03-30 00:00 |
19:31:07.46 |
-35:34:41.3 |
HIP 96113 |
18.51 |
| 2026-03-30 12:00 |
19:31:14.83 |
-35:36:07.1 |
HIP 96113 |
17.83 |
| 2026-03-31 00:00 |
19:31:22.04 |
-35:37:33.4 |
HIP 96113 |
17.40 |
| 2026-03-31 12:00 |
19:31:29.09 |
-35:39:00.2 |
HIP 96113 |
17.23 |
| 2026-04-01 00:00 |
19:31:35.98 |
-35:40:27.6 |
HIP 96113 |
17.34 |
| 2026-04-01 12:00 |
19:31:42.70 |
-35:41:55.4 |
HIP 96113 |
17.70 |
| 2026-04-02 00:00 |
19:31:49.25 |
-35:43:23.8 |
HIP 96113 |
18.30 |
| 2026-04-02 12:00 |
19:31:55.64 |
-35:44:52.6 |
HIP 96113 |
19.11 |
| 2026-04-03 00:00 |
19:32:01.86 |
-35:46:22.0 |
HIP 96113 |
20.10 |
| 2026-04-03 12:00 |
19:32:07.92 |
-35:47:51.9 |
HIP 96113 |
21.24 |
| 2026-04-04 00:00 |
19:32:13.80 |
-35:49:22.3 |
HIP 96113 |
22.50 |
| 2026-04-04 12:00 |
19:32:19.52 |
-35:50:53.2 |
HIP 96113 |
23.86 |
| 2026-04-05 00:00 |
19:32:25.07 |
-35:52:24.5 |
HIP 96113 |
25.31 |
| 2026-04-05 12:00 |
19:32:30.45 |
-35:53:56.4 |
HIP 96113 |
26.81 |
| 2026-04-06 00:00 |
19:32:35.66 |
-35:55:28.8 |
HIP 96113 |
28.37 |
| 2026-04-06 12:00 |
19:32:40.70 |
-35:57:01.7 |
HIP 96259 |
26.92 |
| 2026-04-07 00:00 |
19:32:45.57 |
-35:58:35.1 |
HIP 96259 |
25.15 |
| 2026-04-07 12:00 |
19:32:50.26 |
-36:00:09.0 |
HIP 96259 |
23.41 |
| 2026-04-08 00:00 |
19:32:54.79 |
-36:01:43.4 |
HIP 96259 |
21.72 |
| 2026-04-08 12:00 |
19:32:59.13 |
-36:03:18.3 |
HIP 96259 |
20.07 |
| 2026-04-09 00:00 |
19:33:03.31 |
-36:04:53.7 |
HIP 96259 |
18.47 |
| 2026-04-09 12:00 |
19:33:07.31 |
-36:06:29.5 |
HIP 96259 |
16.95 |
| 2026-04-10 00:00 |
19:33:11.14 |
-36:08:05.8 |
HIP 96259 |
15.51 |
| 2026-04-10 12:00 |
19:33:14.78 |
-36:09:42.7 |
HIP 96259 |
14.17 |
| 2026-04-11 00:00 |
19:33:18.26 |
-36:11:20.0 |
HIP 96259 |
12.98 |
| 2026-04-11 12:00 |
19:33:21.55 |
-36:12:57.7 |
HIP 96259 |
11.96 |
| 2026-04-12 00:00 |
19:33:24.67 |
-36:14:36.0 |
HIP 96259 |
11.17 |
| 2026-04-12 12:00 |
19:33:27.61 |
-36:16:14.7 |
HIP 96259 |
10.64 |
| 2026-04-13 00:00 |
19:33:30.37 |
-36:17:53.9 |
HIP 96259 |
10.43 |
| 2026-04-13 12:00 |
19:33:32.95 |
-36:19:33.6 |
HIP 96259 |
10.54 |
| 2026-04-14 00:00 |
19:33:35.35 |
-36:21:13.7 |
HIP 96259 |
10.96 |
| 2026-04-14 12:00 |
19:33:37.57 |
-36:22:54.3 |
HIP 96259 |
11.66 |
| 2026-04-15 00:00 |
19:33:39.61 |
-36:24:35.3 |
HIP 96259 |
12.60 |
| 2026-04-15 12:00 |
19:33:41.47 |
-36:26:16.8 |
HIP 96213 |
11.98 |
| 2026-04-16 00:00 |
19:33:43.15 |
-36:27:58.7 |
HIP 96213 |
10.25 |