| Parameter |
Value |
| Designation |
244P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-20T23:08:24.253440Z |
| Orbit solution date (soln_date, UTC) |
2024-06-06T23:12:46Z |
| Obs used |
1834 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-02-26.0000000 |
| e |
0.19863567 |
| q (au) |
3.920521 |
| a (au) |
4.892308 |
| i (deg) |
2.259254 |
| Ω (om, deg) |
354.132300 |
| ω (w, deg) |
92.754137 |
| M (ma, deg) |
69.863291 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.865 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.865 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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 |
| 2020-08-18 |
2024-05-27 |
+26.0623 |
-16.089 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
14:23:05.23 |
-16:21:19.9 |
HIP 70379 |
19.76 |
| 2026-05-12 12:00 |
14:22:50.32 |
-16:20:08.2 |
HIP 70185 |
18.74 |
| 2026-05-13 00:00 |
14:22:35.47 |
-16:18:56.7 |
HIP 70185 |
15.00 |
| 2026-05-13 12:00 |
14:22:20.70 |
-16:17:45.2 |
HIP 70185 |
11.28 |
| 2026-05-14 00:00 |
14:22:05.99 |
-16:16:34.0 |
HIP 70185 |
7.60 |
| 2026-05-14 12:00 |
14:21:51.36 |
-16:15:22.9 |
HIP 70186 |
3.97 |
| 2026-05-15 00:00 |
14:21:36.81 |
-16:14:11.9 |
HIP 70186 |
1.07 |
| 2026-05-15 12:00 |
14:21:22.34 |
-16:13:01.2 |
HIP 70186 |
3.69 |
| 2026-05-16 00:00 |
14:21:07.94 |
-16:11:50.7 |
HIP 70186 |
7.26 |
| 2026-05-16 12:00 |
14:20:53.63 |
-16:10:40.4 |
HIP 70186 |
10.86 |
| 2026-05-17 00:00 |
14:20:39.41 |
-16:09:30.4 |
HIP 70186 |
14.46 |
| 2026-05-17 12:00 |
14:20:25.28 |
-16:08:20.6 |
HIP 70186 |
18.04 |
| 2026-05-18 00:00 |
14:20:11.24 |
-16:07:11.0 |
HIP 70186 |
21.60 |
| 2026-05-18 12:00 |
14:19:57.29 |
-16:06:01.8 |
HIP 70186 |
25.14 |
| 2026-05-19 00:00 |
14:19:43.44 |
-16:04:52.8 |
HIP 69861 |
27.66 |
| 2026-05-19 12:00 |
14:19:29.69 |
-16:03:44.1 |
HIP 69861 |
24.25 |
| 2026-05-20 00:00 |
14:19:16.03 |
-16:02:35.8 |
HIP 69861 |
20.90 |
| 2026-05-20 12:00 |
14:19:02.48 |
-16:01:27.8 |
HIP 69861 |
17.62 |
| 2026-05-21 00:00 |
14:18:49.04 |
-16:00:20.1 |
HIP 69861 |
14.44 |
| 2026-05-21 12:00 |
14:18:35.69 |
-15:59:12.8 |
HIP 69861 |
11.43 |
| 2026-05-22 00:00 |
14:18:22.46 |
-15:58:05.9 |
HIP 69861 |
8.72 |
| 2026-05-22 12:00 |
14:18:09.34 |
-15:56:59.3 |
HIP 69861 |
6.66 |
| 2026-05-23 00:00 |
14:17:56.33 |
-15:55:53.1 |
HIP 69861 |
5.92 |
| 2026-05-23 12:00 |
14:17:43.44 |
-15:54:47.3 |
HIP 69861 |
6.90 |
| 2026-05-24 00:00 |
14:17:30.66 |
-15:53:42.0 |
HIP 69861 |
9.02 |
| 2026-05-24 12:00 |
14:17:17.99 |
-15:52:37.0 |
HIP 69861 |
11.66 |
| 2026-05-25 00:00 |
14:17:05.45 |
-15:51:32.5 |
HIP 69861 |
14.51 |
| 2026-05-25 12:00 |
14:16:53.03 |
-15:50:28.5 |
HIP 69861 |
17.45 |
| 2026-05-26 00:00 |
14:16:40.73 |
-15:49:24.9 |
HIP 69683 |
19.66 |
| 2026-05-26 12:00 |
14:16:28.55 |
-15:48:21.7 |
HIP 69683 |
18.91 |
| 2026-05-27 00:00 |
14:16:16.50 |
-15:47:19.1 |
HIP 69683 |
18.66 |
| 2026-05-27 12:00 |
14:16:04.58 |
-15:46:16.9 |
HIP 69683 |
18.92 |
| 2026-05-28 00:00 |
14:15:52.78 |
-15:45:15.2 |
HIP 69683 |
19.64 |
| 2026-05-28 12:00 |
14:15:41.12 |
-15:44:14.0 |
HIP 69683 |
20.77 |
| 2026-05-29 00:00 |
14:15:29.59 |
-15:43:13.4 |
HIP 69683 |
22.22 |
| 2026-05-29 12:00 |
14:15:18.19 |
-15:42:13.2 |
HIP 69683 |
23.94 |
| 2026-05-30 00:00 |
14:15:06.92 |
-15:41:13.6 |
HIP 69562 |
22.70 |
| 2026-05-30 12:00 |
14:14:55.79 |
-15:40:14.6 |
HIP 69562 |
20.63 |
| 2026-05-31 00:00 |
14:14:44.80 |
-15:39:16.1 |
HIP 69562 |
18.79 |
| 2026-05-31 12:00 |
14:14:33.94 |
-15:38:18.2 |
HIP 69562 |
17.23 |
| 2026-06-01 00:00 |
14:14:23.23 |
-15:37:20.8 |
HIP 69562 |
16.01 |
| 2026-06-01 12:00 |
14:14:12.66 |
-15:36:24.0 |
HIP 69455 |
14.48 |
| 2026-06-02 00:00 |
14:14:02.22 |
-15:35:27.8 |
HIP 69455 |
12.10 |