메타데이터
| 항목 |
값 |
| Designation |
C/1999 S2 (McNaught-Watson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-11-22T14:49:59.252160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2000-03-17.0000000 |
| e |
1.00527083 |
| q (au) |
6.467743 |
| a (au) |
-1227.083165 |
| i (deg) |
65.820220 |
| Ω (om, deg) |
74.460976 |
| ω (w, deg) |
223.497414 |
| M (ma, deg) |
0.019384 |
밝기
산란 + 전체 선형
$$
M_a = (12.223 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.223 |
| n |
2.000 |
| gf |
0.828 |
| gb |
-0.827 |
| k |
0.800 |
| δ90 |
9.796 |
| 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) |
| 2026-03-26 00:00 |
04:46:53.35 |
+22:00:26.4 |
HIP 22291 |
18.67 |
| 2026-03-26 12:00 |
04:46:54.39 |
+22:00:31.1 |
HIP 22291 |
18.43 |
| 2026-03-27 00:00 |
04:46:55.46 |
+22:00:35.9 |
HIP 22291 |
18.17 |
| 2026-03-27 12:00 |
04:46:56.54 |
+22:00:40.7 |
HIP 22291 |
17.92 |
| 2026-03-28 00:00 |
04:46:57.65 |
+22:00:45.5 |
HIP 22291 |
17.66 |
| 2026-03-28 12:00 |
04:46:58.77 |
+22:00:50.3 |
HIP 22291 |
17.40 |
| 2026-03-29 00:00 |
04:46:59.92 |
+22:00:55.2 |
HIP 22291 |
17.13 |
| 2026-03-29 12:00 |
04:47:01.09 |
+22:01:00.1 |
HIP 22291 |
16.86 |
| 2026-03-30 00:00 |
04:47:02.28 |
+22:01:05.1 |
HIP 22291 |
16.58 |
| 2026-03-30 12:00 |
04:47:03.49 |
+22:01:10.0 |
HIP 22291 |
16.30 |
| 2026-03-31 00:00 |
04:47:04.72 |
+22:01:15.0 |
HIP 22291 |
16.02 |
| 2026-03-31 12:00 |
04:47:05.97 |
+22:01:20.1 |
HIP 22291 |
15.73 |
| 2026-04-01 00:00 |
04:47:07.23 |
+22:01:25.2 |
HIP 22291 |
15.44 |
| 2026-04-01 12:00 |
04:47:08.52 |
+22:01:30.3 |
HIP 22291 |
15.15 |
| 2026-04-02 00:00 |
04:47:09.83 |
+22:01:35.4 |
HIP 22291 |
14.85 |
| 2026-04-02 12:00 |
04:47:11.16 |
+22:01:40.6 |
HIP 22291 |
14.55 |
| 2026-04-03 00:00 |
04:47:12.51 |
+22:01:45.8 |
HIP 22291 |
14.25 |
| 2026-04-03 12:00 |
04:47:13.87 |
+22:01:51.0 |
HIP 22291 |
13.94 |
| 2026-04-04 00:00 |
04:47:15.26 |
+22:01:56.3 |
HIP 22291 |
13.63 |
| 2026-04-04 12:00 |
04:47:16.67 |
+22:02:01.6 |
HIP 22291 |
13.32 |
| 2026-04-05 00:00 |
04:47:18.09 |
+22:02:06.9 |
HIP 22291 |
13.00 |
| 2026-04-05 12:00 |
04:47:19.53 |
+22:02:12.2 |
HIP 22291 |
12.69 |
| 2026-04-06 00:00 |
04:47:21.00 |
+22:02:17.6 |
HIP 22291 |
12.37 |
| 2026-04-06 12:00 |
04:47:22.48 |
+22:02:23.0 |
HIP 22291 |
12.05 |
| 2026-04-07 00:00 |
04:47:23.98 |
+22:02:28.5 |
HIP 22291 |
11.73 |
| 2026-04-07 12:00 |
04:47:25.50 |
+22:02:34.0 |
HIP 22291 |
11.40 |
| 2026-04-08 00:00 |
04:47:27.03 |
+22:02:39.5 |
HIP 22291 |
11.08 |
| 2026-04-08 12:00 |
04:47:28.59 |
+22:02:45.0 |
HIP 22291 |
10.75 |
| 2026-04-09 00:00 |
04:47:30.16 |
+22:02:50.6 |
HIP 22291 |
10.43 |
| 2026-04-09 12:00 |
04:47:31.75 |
+22:02:56.1 |
HIP 22291 |
10.10 |
| 2026-04-10 00:00 |
04:47:33.36 |
+22:03:01.8 |
HIP 22291 |
9.78 |
| 2026-04-10 12:00 |
04:47:34.99 |
+22:03:07.4 |
HIP 22291 |
9.45 |
| 2026-04-11 00:00 |
04:47:36.64 |
+22:03:13.1 |
HIP 22291 |
9.13 |
| 2026-04-11 12:00 |
04:47:38.30 |
+22:03:18.8 |
HIP 22291 |
8.81 |
| 2026-04-12 00:00 |
04:47:39.98 |
+22:03:24.5 |
HIP 22291 |
8.50 |
| 2026-04-12 12:00 |
04:47:41.68 |
+22:03:30.3 |
HIP 22291 |
8.19 |
| 2026-04-13 00:00 |
04:47:43.40 |
+22:03:36.0 |
HIP 22291 |
7.89 |
| 2026-04-13 12:00 |
04:47:45.13 |
+22:03:41.9 |
HIP 22291 |
7.59 |
| 2026-04-14 00:00 |
04:47:46.88 |
+22:03:47.7 |
HIP 22291 |
7.30 |
| 2026-04-14 12:00 |
04:47:48.65 |
+22:03:53.5 |
HIP 22291 |
7.03 |
| 2026-04-15 00:00 |
04:47:50.43 |
+22:03:59.4 |
HIP 22291 |
6.77 |
| 2026-04-15 12:00 |
04:47:52.23 |
+22:04:05.3 |
HIP 22291 |
6.52 |
| 2026-04-16 00:00 |
04:47:54.05 |
+22:04:11.3 |
HIP 22291 |
6.29 |