메타데이터
| 항목 |
값 |
| 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 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (12.430 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.430 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
07:33:16.25 |
+24:19:02.5 |
HIP 36623 |
21.70 |
| 2026-05-12 12:00 |
07:33:17.63 |
+24:18:57.5 |
HIP 36623 |
22.01 |
| 2026-05-13 00:00 |
07:33:19.02 |
+24:18:52.6 |
HIP 36623 |
22.33 |
| 2026-05-13 12:00 |
07:33:20.43 |
+24:18:47.6 |
HIP 36623 |
22.64 |
| 2026-05-14 00:00 |
07:33:21.86 |
+24:18:42.6 |
HIP 36883 |
22.38 |
| 2026-05-14 12:00 |
07:33:23.30 |
+24:18:37.6 |
HIP 36883 |
22.04 |
| 2026-05-15 00:00 |
07:33:24.77 |
+24:18:32.5 |
HIP 36883 |
21.70 |
| 2026-05-15 12:00 |
07:33:26.25 |
+24:18:27.4 |
HIP 36883 |
21.36 |
| 2026-05-16 00:00 |
07:33:27.75 |
+24:18:22.2 |
HIP 36883 |
21.01 |
| 2026-05-16 12:00 |
07:33:29.27 |
+24:18:17.1 |
HIP 36883 |
20.65 |
| 2026-05-17 00:00 |
07:33:30.80 |
+24:18:11.9 |
HIP 36883 |
20.30 |
| 2026-05-17 12:00 |
07:33:32.36 |
+24:18:06.6 |
HIP 36883 |
19.94 |
| 2026-05-18 00:00 |
07:33:33.93 |
+24:18:01.4 |
HIP 36883 |
19.57 |
| 2026-05-18 12:00 |
07:33:35.51 |
+24:17:56.1 |
HIP 36883 |
19.20 |
| 2026-05-19 00:00 |
07:33:37.12 |
+24:17:50.7 |
HIP 36883 |
18.83 |
| 2026-05-19 12:00 |
07:33:38.74 |
+24:17:45.4 |
HIP 36883 |
18.45 |
| 2026-05-20 00:00 |
07:33:40.37 |
+24:17:40.0 |
HIP 36883 |
18.07 |
| 2026-05-20 12:00 |
07:33:42.03 |
+24:17:34.6 |
HIP 36883 |
17.69 |
| 2026-05-21 00:00 |
07:33:43.70 |
+24:17:29.1 |
HIP 36883 |
17.30 |
| 2026-05-21 12:00 |
07:33:45.38 |
+24:17:23.7 |
HIP 36883 |
16.91 |
| 2026-05-22 00:00 |
07:33:47.09 |
+24:17:18.2 |
HIP 36883 |
16.52 |
| 2026-05-22 12:00 |
07:33:48.81 |
+24:17:12.7 |
HIP 36883 |
16.12 |
| 2026-05-23 00:00 |
07:33:50.54 |
+24:17:07.1 |
HIP 36883 |
15.72 |
| 2026-05-23 12:00 |
07:33:52.29 |
+24:17:01.5 |
HIP 36883 |
15.31 |
| 2026-05-24 00:00 |
07:33:54.06 |
+24:16:55.9 |
HIP 36883 |
14.91 |
| 2026-05-24 12:00 |
07:33:55.84 |
+24:16:50.3 |
HIP 36883 |
14.49 |
| 2026-05-25 00:00 |
07:33:57.63 |
+24:16:44.6 |
HIP 36883 |
14.08 |
| 2026-05-25 12:00 |
07:33:59.45 |
+24:16:39.0 |
HIP 36883 |
13.66 |
| 2026-05-26 00:00 |
07:34:01.27 |
+24:16:33.2 |
HIP 36883 |
13.24 |
| 2026-05-26 12:00 |
07:34:03.12 |
+24:16:27.5 |
HIP 36883 |
12.82 |
| 2026-05-27 00:00 |
07:34:04.97 |
+24:16:21.8 |
HIP 36883 |
12.39 |
| 2026-05-27 12:00 |
07:34:06.84 |
+24:16:16.0 |
HIP 36883 |
11.96 |
| 2026-05-28 00:00 |
07:34:08.73 |
+24:16:10.2 |
HIP 36883 |
11.53 |
| 2026-05-28 12:00 |
07:34:10.63 |
+24:16:04.4 |
HIP 36883 |
11.10 |
| 2026-05-29 00:00 |
07:34:12.55 |
+24:15:58.5 |
HIP 36883 |
10.66 |
| 2026-05-29 12:00 |
07:34:14.48 |
+24:15:52.6 |
HIP 36883 |
10.22 |
| 2026-05-30 00:00 |
07:34:16.42 |
+24:15:46.7 |
HIP 36883 |
9.78 |
| 2026-05-30 12:00 |
07:34:18.38 |
+24:15:40.8 |
HIP 36883 |
9.33 |
| 2026-05-31 00:00 |
07:34:20.35 |
+24:15:34.9 |
HIP 36883 |
8.89 |
| 2026-05-31 12:00 |
07:34:22.33 |
+24:15:28.9 |
HIP 36883 |
8.44 |
| 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 |