메타데이터
| 항목 |
값 |
| Designation |
C/1999 T1 (McNaught-Hartley) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-12-13T11:19:42.432960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
661 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
7.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2000-11-18.0000000 |
| e |
0.99985577 |
| q (au) |
1.171699 |
| a (au) |
8123.927279 |
| i (deg) |
79.975213 |
| Ω (om, deg) |
182.483007 |
| ω (w, deg) |
344.758001 |
| M (ma, deg) |
359.999966 |
밝기
산란 + 전체 선형
$$
M_a = (5.381 + 4.354\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.381 |
| n |
4.354 |
| gf |
0.998 |
| gb |
-0.917 |
| k |
0.998 |
| δ90 |
9.996 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 1999-10-07 |
2000-01-03 |
+19.0088 |
-13.854 |
| 2000-01-03 |
2000-12-12 |
-2.2204 |
+0.385 |
| 2000-12-15 |
2001-11-05 |
+1.3645 |
-0.126 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
22:47:45.69 |
+28:40:45.1 |
HIP 112619 |
10.48 |
| 2026-09-20 12:00 |
22:47:43.23 |
+28:40:26.5 |
HIP 112619 |
11.08 |
| 2026-09-21 00:00 |
22:47:40.78 |
+28:40:07.7 |
HIP 112619 |
11.69 |
| 2026-09-21 12:00 |
22:47:38.34 |
+28:39:48.9 |
HIP 112619 |
12.29 |
| 2026-09-22 00:00 |
22:47:35.90 |
+28:39:29.8 |
HIP 112471 |
12.35 |
| 2026-09-22 12:00 |
22:47:33.47 |
+28:39:10.6 |
HIP 112471 |
11.74 |
| 2026-09-23 00:00 |
22:47:31.05 |
+28:38:51.3 |
HIP 112471 |
11.13 |
| 2026-09-23 12:00 |
22:47:28.64 |
+28:38:31.8 |
HIP 112471 |
10.52 |
| 2026-09-24 00:00 |
22:47:26.23 |
+28:38:12.1 |
HIP 112471 |
9.92 |
| 2026-09-24 12:00 |
22:47:23.84 |
+28:37:52.4 |
HIP 112471 |
9.31 |
| 2026-09-25 00:00 |
22:47:21.45 |
+28:37:32.4 |
HIP 112471 |
8.71 |
| 2026-09-25 12:00 |
22:47:19.07 |
+28:37:12.4 |
HIP 112471 |
8.11 |
| 2026-09-26 00:00 |
22:47:16.70 |
+28:36:52.2 |
HIP 112471 |
7.51 |
| 2026-09-26 12:00 |
22:47:14.34 |
+28:36:31.8 |
HIP 112471 |
6.92 |
| 2026-09-27 00:00 |
22:47:11.98 |
+28:36:11.3 |
HIP 112471 |
6.33 |
| 2026-09-27 12:00 |
22:47:09.64 |
+28:35:50.7 |
HIP 112471 |
5.75 |
| 2026-09-28 00:00 |
22:47:07.31 |
+28:35:30.0 |
HIP 112471 |
5.17 |
| 2026-09-28 12:00 |
22:47:04.98 |
+28:35:09.1 |
HIP 112471 |
4.60 |
| 2026-09-29 00:00 |
22:47:02.67 |
+28:34:48.1 |
HIP 112471 |
4.05 |
| 2026-09-29 12:00 |
22:47:00.37 |
+28:34:26.9 |
HIP 112471 |
3.52 |
| 2026-09-30 00:00 |
22:46:58.07 |
+28:34:05.6 |
HIP 112471 |
3.02 |
| 2026-09-30 12:00 |
22:46:55.79 |
+28:33:44.2 |
HIP 112471 |
2.57 |
| 2026-10-01 00:00 |
22:46:53.52 |
+28:33:22.7 |
HIP 112471 |
2.19 |
| 2026-10-01 12:00 |
22:46:51.26 |
+28:33:01.0 |
HIP 112471 |
1.94 |
| 2026-10-02 00:00 |
22:46:49.01 |
+28:32:39.3 |
HIP 112471 |
1.87 |
| 2026-10-02 12:00 |
22:46:46.77 |
+28:32:17.4 |
HIP 112471 |
1.98 |
| 2026-10-03 00:00 |
22:46:44.54 |
+28:31:55.3 |
HIP 112471 |
2.26 |
| 2026-10-03 12:00 |
22:46:42.33 |
+28:31:33.2 |
HIP 112471 |
2.65 |
| 2026-10-04 00:00 |
22:46:40.12 |
+28:31:10.9 |
HIP 112471 |
3.11 |
| 2026-10-04 12:00 |
22:46:37.93 |
+28:30:48.6 |
HIP 112471 |
3.61 |
| 2026-10-05 00:00 |
22:46:35.75 |
+28:30:26.1 |
HIP 112471 |
4.14 |
| 2026-10-05 12:00 |
22:46:33.58 |
+28:30:03.5 |
HIP 112471 |
4.69 |
| 2026-10-06 00:00 |
22:46:31.43 |
+28:29:40.8 |
HIP 112471 |
5.25 |
| 2026-10-06 12:00 |
22:46:29.29 |
+28:29:18.0 |
HIP 112471 |
5.81 |
| 2026-10-07 00:00 |
22:46:27.16 |
+28:28:55.0 |
HIP 112471 |
6.38 |
| 2026-10-07 12:00 |
22:46:25.04 |
+28:28:32.0 |
HIP 112471 |
6.95 |
| 2026-10-08 00:00 |
22:46:22.94 |
+28:28:08.9 |
HIP 112471 |
7.53 |
| 2026-10-08 12:00 |
22:46:20.85 |
+28:27:45.6 |
HIP 112471 |
8.11 |
| 2026-10-09 00:00 |
22:46:18.77 |
+28:27:22.3 |
HIP 112471 |
8.69 |
| 2026-10-09 12:00 |
22:46:16.71 |
+28:26:58.8 |
HIP 112471 |
9.27 |
| 2026-10-10 00:00 |
22:46:14.66 |
+28:26:35.3 |
HIP 112471 |
9.85 |
| 2026-10-10 12:00 |
22:46:12.63 |
+28:26:11.7 |
HIP 112471 |
10.43 |
| 2026-10-11 00:00 |
22:46:10.61 |
+28:25:48.0 |
HIP 112471 |
11.01 |