메타데이터
| 항목 |
값 |
| Designation |
C/2019 T4 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-06-08T23:44:31.977600Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:20Z |
| Obs used |
5476 |
| NEO |
- |
| M1 |
4.400 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-10-09T13:58:04.368000Z |
| Discovery magnitude (MPC) |
19.39 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2023-02-14.0000000 |
| e |
0.99562110 |
| q (au) |
4.242148 |
| a (au) |
968.770059 |
| i (deg) |
53.632165 |
| Ω (om, deg) |
199.939253 |
| ω (w, deg) |
351.177452 |
| M (ma, deg) |
0.008172 |
밝기
산란 + 전체 선형
$$
M_a = (3.119 + 4.200\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.119 |
| n |
4.200 |
| gf |
0.989 |
| gb |
-0.743 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-02-05 |
2021-02-02 |
+6.6976 |
-5.781 |
| 2021-02-02 |
2022-06-06 |
-0.8622 |
+0.130 |
| 2022-06-11 |
2025-10-20 |
+0.0696 |
-0.299 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
19:38:22.57 |
+35:25:12.4 |
HIP 96579 |
10.58 |
| 2026-06-01 12:00 |
19:38:16.28 |
+35:26:31.6 |
HIP 96579 |
11.39 |
| 2026-06-02 00:00 |
19:38:09.91 |
+35:27:49.9 |
HIP 96579 |
12.41 |
| 2026-06-02 12:00 |
19:38:03.46 |
+35:29:07.2 |
HIP 96579 |
13.58 |
| 2026-06-03 00:00 |
19:37:56.94 |
+35:30:23.7 |
HIP 96579 |
14.88 |
| 2026-06-03 12:00 |
19:37:50.34 |
+35:31:39.1 |
HIP 96579 |
16.27 |
| 2026-06-04 00:00 |
19:37:43.66 |
+35:32:53.7 |
HIP 96579 |
17.72 |
| 2026-06-04 12:00 |
19:37:36.91 |
+35:34:07.2 |
HIP 96579 |
19.24 |
| 2026-06-05 00:00 |
19:37:30.09 |
+35:35:19.8 |
HIP 96579 |
20.79 |
| 2026-06-05 12:00 |
19:37:23.20 |
+35:36:31.5 |
HIP 96579 |
22.38 |
| 2026-06-06 00:00 |
19:37:16.23 |
+35:37:42.2 |
HIP 96579 |
24.00 |
| 2026-06-06 12:00 |
19:37:09.20 |
+35:38:51.8 |
HIP 96338 |
24.20 |
| 2026-06-07 00:00 |
19:37:02.09 |
+35:40:00.5 |
HIP 96340 |
22.69 |
| 2026-06-07 12:00 |
19:36:54.91 |
+35:41:08.3 |
HIP 96340 |
21.14 |
| 2026-06-08 00:00 |
19:36:47.66 |
+35:42:15.0 |
HIP 96340 |
19.64 |
| 2026-06-08 12:00 |
19:36:40.35 |
+35:43:20.7 |
HIP 96340 |
18.18 |
| 2026-06-09 00:00 |
19:36:32.97 |
+35:44:25.3 |
HIP 96340 |
16.78 |
| 2026-06-09 12:00 |
19:36:25.52 |
+35:45:29.0 |
HIP 96340 |
15.46 |
| 2026-06-10 00:00 |
19:36:18.01 |
+35:46:31.6 |
HIP 96340 |
14.24 |
| 2026-06-10 12:00 |
19:36:10.43 |
+35:47:33.2 |
HIP 96340 |
13.15 |
| 2026-06-11 00:00 |
19:36:02.78 |
+35:48:33.8 |
HIP 96340 |
12.23 |
| 2026-06-11 12:00 |
19:35:55.08 |
+35:49:33.3 |
HIP 96340 |
11.51 |
| 2026-06-12 00:00 |
19:35:47.31 |
+35:50:31.8 |
HIP 96340 |
11.03 |
| 2026-06-12 12:00 |
19:35:39.48 |
+35:51:29.2 |
HIP 96340 |
10.83 |
| 2026-06-13 00:00 |
19:35:31.59 |
+35:52:25.5 |
HIP 96340 |
10.93 |
| 2026-06-13 12:00 |
19:35:23.64 |
+35:53:20.8 |
HIP 96340 |
11.31 |
| 2026-06-14 00:00 |
19:35:15.63 |
+35:54:15.0 |
HIP 96340 |
11.96 |
| 2026-06-14 12:00 |
19:35:07.56 |
+35:55:08.1 |
HIP 96340 |
12.82 |
| 2026-06-15 00:00 |
19:34:59.43 |
+35:56:00.1 |
HIP 96340 |
13.87 |
| 2026-06-15 12:00 |
19:34:51.25 |
+35:56:51.0 |
HIP 96340 |
15.06 |
| 2026-06-16 00:00 |
19:34:43.02 |
+35:57:40.9 |
HIP 96194 |
14.48 |
| 2026-06-16 12:00 |
19:34:34.73 |
+35:58:29.6 |
HIP 96194 |
12.62 |
| 2026-06-17 00:00 |
19:34:26.39 |
+35:59:17.2 |
HIP 96194 |
10.77 |
| 2026-06-17 12:00 |
19:34:18.00 |
+36:00:03.7 |
HIP 96194 |
8.91 |
| 2026-06-18 00:00 |
19:34:09.55 |
+36:00:49.1 |
HIP 96194 |
7.06 |
| 2026-06-18 12:00 |
19:34:01.06 |
+36:01:33.3 |
HIP 96194 |
5.21 |
| 2026-06-19 00:00 |
19:33:52.52 |
+36:02:16.5 |
HIP 96194 |
3.38 |
| 2026-06-19 12:00 |
19:33:43.93 |
+36:02:58.5 |
HIP 96194 |
1.62 |
| 2026-06-20 00:00 |
19:33:35.30 |
+36:03:39.3 |
HIP 96194 |
0.90 |
| 2026-06-20 12:00 |
19:33:26.62 |
+36:04:19.1 |
HIP 96194 |
2.45 |
| 2026-06-21 00:00 |
19:33:17.89 |
+36:04:57.7 |
HIP 96194 |
4.27 |
| 2026-06-21 12:00 |
19:33:09.13 |
+36:05:35.2 |
HIP 96189 |
5.97 |
| 2026-06-22 00:00 |
19:33:00.32 |
+36:06:11.5 |
HIP 96189 |
7.70 |