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
$$
M_a = (12.224 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.224 |
| n |
2.000 |
| gf |
0.977 |
| gb |
-0.827 |
| k |
0.800 |
| δ90 |
9.955 |
| 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) |
| 2026-07-29 00:00 |
04:56:05.31 |
+22:26:33.8 |
HIP 22935 |
8.04 |
| 2026-07-29 12:00 |
04:56:07.02 |
+22:26:38.9 |
HIP 22935 |
7.95 |
| 2026-07-30 00:00 |
04:56:08.71 |
+22:26:44.0 |
HIP 22935 |
7.88 |
| 2026-07-30 12:00 |
04:56:10.38 |
+22:26:49.0 |
HIP 22935 |
7.83 |
| 2026-07-31 00:00 |
04:56:12.04 |
+22:26:54.1 |
HIP 22935 |
7.80 |
| 2026-07-31 12:00 |
04:56:13.68 |
+22:26:59.1 |
HIP 22935 |
7.79 |
| 2026-08-01 00:00 |
04:56:15.30 |
+22:27:04.0 |
HIP 22935 |
7.80 |
| 2026-08-01 12:00 |
04:56:16.91 |
+22:27:09.0 |
HIP 22935 |
7.82 |
| 2026-08-02 00:00 |
04:56:18.49 |
+22:27:13.9 |
HIP 22935 |
7.86 |
| 2026-08-02 12:00 |
04:56:20.06 |
+22:27:18.8 |
HIP 22935 |
7.92 |
| 2026-08-03 00:00 |
04:56:21.61 |
+22:27:23.7 |
HIP 22935 |
8.00 |
| 2026-08-03 12:00 |
04:56:23.15 |
+22:27:28.5 |
HIP 22935 |
8.08 |
| 2026-08-04 00:00 |
04:56:24.67 |
+22:27:33.4 |
HIP 22935 |
8.19 |
| 2026-08-04 12:00 |
04:56:26.16 |
+22:27:38.1 |
HIP 22935 |
8.30 |
| 2026-08-05 00:00 |
04:56:27.65 |
+22:27:42.9 |
HIP 22935 |
8.43 |
| 2026-08-05 12:00 |
04:56:29.11 |
+22:27:47.6 |
HIP 22935 |
8.56 |
| 2026-08-06 00:00 |
04:56:30.55 |
+22:27:52.3 |
HIP 22935 |
8.71 |
| 2026-08-06 12:00 |
04:56:31.98 |
+22:27:57.0 |
HIP 22935 |
8.86 |
| 2026-08-07 00:00 |
04:56:33.38 |
+22:28:01.6 |
HIP 22935 |
9.02 |
| 2026-08-07 12:00 |
04:56:34.77 |
+22:28:06.3 |
HIP 22935 |
9.19 |
| 2026-08-08 00:00 |
04:56:36.14 |
+22:28:10.8 |
HIP 22935 |
9.37 |
| 2026-08-08 12:00 |
04:56:37.49 |
+22:28:15.4 |
HIP 22935 |
9.55 |
| 2026-08-09 00:00 |
04:56:38.83 |
+22:28:19.9 |
HIP 22935 |
9.73 |
| 2026-08-09 12:00 |
04:56:40.14 |
+22:28:24.4 |
HIP 22935 |
9.92 |
| 2026-08-10 00:00 |
04:56:41.43 |
+22:28:28.9 |
HIP 22935 |
10.11 |
| 2026-08-10 12:00 |
04:56:42.71 |
+22:28:33.3 |
HIP 22935 |
10.30 |
| 2026-08-11 00:00 |
04:56:43.96 |
+22:28:37.7 |
HIP 22935 |
10.49 |
| 2026-08-11 12:00 |
04:56:45.20 |
+22:28:42.1 |
HIP 22935 |
10.69 |
| 2026-08-12 00:00 |
04:56:46.41 |
+22:28:46.4 |
HIP 22935 |
10.88 |
| 2026-08-12 12:00 |
04:56:47.61 |
+22:28:50.8 |
HIP 22935 |
11.08 |
| 2026-08-13 00:00 |
04:56:48.78 |
+22:28:55.0 |
HIP 22935 |
11.28 |
| 2026-08-13 12:00 |
04:56:49.94 |
+22:28:59.3 |
HIP 22935 |
11.47 |
| 2026-08-14 00:00 |
04:56:51.07 |
+22:29:03.5 |
HIP 22935 |
11.67 |
| 2026-08-14 12:00 |
04:56:52.19 |
+22:29:07.7 |
HIP 22935 |
11.86 |
| 2026-08-15 00:00 |
04:56:53.28 |
+22:29:11.9 |
HIP 22935 |
12.06 |
| 2026-08-15 12:00 |
04:56:54.36 |
+22:29:16.0 |
HIP 22935 |
12.25 |
| 2026-08-16 00:00 |
04:56:55.41 |
+22:29:20.1 |
HIP 22935 |
12.44 |
| 2026-08-16 12:00 |
04:56:56.45 |
+22:29:24.2 |
HIP 22935 |
12.63 |
| 2026-08-17 00:00 |
04:56:57.46 |
+22:29:28.2 |
HIP 22935 |
12.81 |
| 2026-08-17 12:00 |
04:56:58.45 |
+22:29:32.2 |
HIP 22935 |
13.00 |
| 2026-08-18 00:00 |
04:56:59.42 |
+22:29:36.2 |
HIP 22935 |
13.18 |
| 2026-08-18 12:00 |
04:57:00.38 |
+22:29:40.1 |
HIP 22935 |
13.36 |
| 2026-08-19 00:00 |
04:57:01.31 |
+22:29:44.1 |
HIP 22935 |
13.53 |