| Parameter |
Value |
| Designation |
C/1997 P2 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-08-31T03:18:18.817920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-08-29.0000000 |
| e |
1.02794485 |
| q (au) |
4.262988 |
| a (au) |
-152.550043 |
| i (deg) |
14.579088 |
| Ω (om, deg) |
302.910064 |
| ω (w, deg) |
24.504901 |
| M (ma, deg) |
-0.001118 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.430 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.430 |
| n |
2.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:34:24.33 |
+24:15:22.9 |
HIP 36883 |
7.99 |
| 2026-06-01 12:00 |
07:34:26.34 |
+24:15:16.9 |
HIP 36883 |
7.54 |
| 2026-06-02 00:00 |
07:34:28.37 |
+24:15:10.9 |
HIP 36883 |
7.09 |
| 2026-06-02 12:00 |
07:34:30.41 |
+24:15:04.9 |
HIP 36883 |
6.64 |
| 2026-06-03 00:00 |
07:34:32.46 |
+24:14:58.8 |
HIP 36883 |
6.19 |
| 2026-06-03 12:00 |
07:34:34.52 |
+24:14:52.7 |
HIP 36883 |
5.75 |
| 2026-06-04 00:00 |
07:34:36.60 |
+24:14:46.6 |
HIP 36883 |
5.30 |
| 2026-06-04 12:00 |
07:34:38.69 |
+24:14:40.5 |
HIP 36883 |
4.87 |
| 2026-06-05 00:00 |
07:34:40.79 |
+24:14:34.4 |
HIP 36883 |
4.43 |
| 2026-06-05 12:00 |
07:34:42.91 |
+24:14:28.2 |
HIP 36883 |
4.01 |
| 2026-06-06 00:00 |
07:34:45.04 |
+24:14:22.0 |
HIP 36883 |
3.61 |
| 2026-06-06 12:00 |
07:34:47.18 |
+24:14:15.8 |
HIP 36883 |
3.23 |
| 2026-06-07 00:00 |
07:34:49.33 |
+24:14:09.6 |
HIP 36883 |
2.88 |
| 2026-06-07 12:00 |
07:34:51.49 |
+24:14:03.4 |
HIP 36883 |
2.59 |
| 2026-06-08 00:00 |
07:34:53.67 |
+24:13:57.2 |
HIP 36883 |
2.36 |
| 2026-06-08 12:00 |
07:34:55.85 |
+24:13:50.9 |
HIP 36883 |
2.23 |
| 2026-06-09 00:00 |
07:34:58.05 |
+24:13:44.6 |
HIP 36883 |
2.21 |
| 2026-06-09 12:00 |
07:35:00.26 |
+24:13:38.3 |
HIP 36883 |
2.30 |
| 2026-06-10 00:00 |
07:35:02.48 |
+24:13:32.0 |
HIP 36883 |
2.50 |
| 2026-06-10 12:00 |
07:35:04.72 |
+24:13:25.7 |
HIP 36883 |
2.79 |
| 2026-06-11 00:00 |
07:35:06.96 |
+24:13:19.3 |
HIP 36883 |
3.14 |
| 2026-06-11 12:00 |
07:35:09.21 |
+24:13:13.0 |
HIP 36883 |
3.53 |
| 2026-06-12 00:00 |
07:35:11.48 |
+24:13:06.6 |
HIP 36883 |
3.95 |
| 2026-06-12 12:00 |
07:35:13.75 |
+24:13:00.2 |
HIP 36883 |
4.40 |
| 2026-06-13 00:00 |
07:35:16.04 |
+24:12:53.8 |
HIP 36883 |
4.87 |
| 2026-06-13 12:00 |
07:35:18.33 |
+24:12:47.4 |
HIP 36883 |
5.35 |
| 2026-06-14 00:00 |
07:35:20.64 |
+24:12:41.0 |
HIP 36883 |
5.85 |
| 2026-06-14 12:00 |
07:35:22.96 |
+24:12:34.6 |
HIP 36883 |
6.35 |
| 2026-06-15 00:00 |
07:35:25.28 |
+24:12:28.1 |
HIP 36883 |
6.86 |
| 2026-06-15 12:00 |
07:35:27.62 |
+24:12:21.6 |
HIP 36883 |
7.37 |
| 2026-06-16 00:00 |
07:35:29.96 |
+24:12:15.2 |
HIP 36883 |
7.89 |
| 2026-06-16 12:00 |
07:35:32.31 |
+24:12:08.7 |
HIP 36883 |
8.42 |
| 2026-06-17 00:00 |
07:35:34.68 |
+24:12:02.2 |
HIP 36883 |
8.95 |
| 2026-06-17 12:00 |
07:35:37.05 |
+24:11:55.7 |
HIP 36883 |
9.49 |
| 2026-06-18 00:00 |
07:35:39.43 |
+24:11:49.2 |
HIP 36883 |
10.03 |
| 2026-06-18 12:00 |
07:35:41.82 |
+24:11:42.6 |
HIP 36883 |
10.57 |
| 2026-06-19 00:00 |
07:35:44.21 |
+24:11:36.1 |
HIP 36883 |
11.11 |
| 2026-06-19 12:00 |
07:35:46.62 |
+24:11:29.6 |
HIP 36883 |
11.66 |
| 2026-06-20 00:00 |
07:35:49.03 |
+24:11:23.0 |
HIP 36883 |
12.21 |
| 2026-06-20 12:00 |
07:35:51.45 |
+24:11:16.5 |
HIP 36883 |
12.77 |
| 2026-06-21 00:00 |
07:35:53.88 |
+24:11:09.9 |
HIP 36883 |
13.32 |
| 2026-06-21 12:00 |
07:35:56.32 |
+24:11:03.3 |
HIP 36883 |
13.88 |
| 2026-06-22 00:00 |
07:35:58.76 |
+24:10:56.7 |
HIP 36883 |
14.44 |